300-615 Troubleshooting Cisco Data Center Infrastructure (300-615 DCIT) Questions and Answers

The selected answer, Reset the peer I/O module, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to UCS, firmware; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

Cisco troubleshooting logic supports Detach the association with the no role command within the feature-group configuration mode as the required fix. In this question the symptoms point to Cisco Nexus, and the defect is best handled by correcting the exact control-plane or consistency condition. Nexus platforms can show interfaces or peers as configured while still refusing to forward traffic if a vPC Type-1 parameter, VLAN allowance, MTU, HSRP version, EVPN route, or routing attribute is wrong. Cisco methodology is to avoid broad resets unless the state machine is stuck; instead, correct the mismatched parameter and verify that the resulting operational state becomes stable. The other choices do not remove the root cause, or they modify a setting that is not used by the failing protocol exchange. After the change, the engineer should review the peer status, route or MAC table, and counters for drops or inconsistency messages. That sequence proves that the network fabric is fixed, not merely restarted.

Fix the JSON syntax by modifying “attribures” to “attribures”: is the required fix because the automation failure is caused by execution context, syntax, or resource state around The, JSON, Python, Use. On Cisco Nexus switches, automation is not a single feature; EEM policies, CLI actions, Guest Shell Linux commands, REST payloads, and scheduled jobs are evaluated by different subsystems. A script can fail even while the switch itself has connectivity or the command works interactively. The selected answer supplies the missing requirement, such as the correct event/action, DNS or resource setting, API URI, payload format, feature enablement, or reboot needed for a Guest Shell change to take effect. The other choices address adjacent features but do not satisfy the failing subsystem. After applying the fix, the engineer should verify the policy registration, job result, API response code, or Guest Shell runtime state and confirm that the intended command is no longer blocked or silently ignored.

The selected option, Add the event -default action statement to the end of the script, is correct for the automation path described. Cisco NX-OS requires precision in EEM applets, scheduler jobs, Guest Shell operations, and REST/NX-API syntax. The affected element is EEM, SNMP; therefore, the fix must be applied to the component that actually executes the action. For EEM, that means a valid event detector and explicit actions, with event-default when the matched CLI command should continue. For Guest Shell and Bash, DNS, proxy, resource allocation, and reboot behavior are local to the Linux container. For REST calls, the class name, method, authentication, and XML/JSON structure must match the APIC or NX-OS object model. The distractors usually change the switch globally or alter an unrelated command. Cisco DCIT automation troubleshooting confirms the fix by checking the returned error, then rerunning the exact job, script, or API operation in the same context.

The selected answer, Add the disjoint Layer 2 VLANs to an existing vNIC rather than adding new vNICs, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to service profile, vNIC; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

The answer is Match vPC domain ID between the two devices; Activate VLANs on the vPC because Cisco Nexus and ACI forwarding depends on exact agreement between the devices participating in the feature. The scenario references vPC; those technologies fail in predictable ways when required parameters do not match or when the required control-plane advertisement is absent. In DCIT troubleshooting, the engineer should identify the failed dependency, correct that dependency, and then verify the operational table that proves the fix. For example, vPC and EVPN checks focus on consistency, VNI/VRF bindings, peer-gateway behavior, and host-route advertisement; routing checks focus on neighbor state, MTU, timers, authentication, next-hop, and route preference. The selected answer addresses the dependency that blocks forwarding. The distractors are plausible because they touch related features, but they do not resolve the specific failure condition. Post-change validation should include protocol state, learned endpoint or route entries, and a traffic test across the affected path.

Install Infrastructure Firmware, then Install Server Firmware is correct because the failure is tied to the UCS managed state of UCS, firmware, Auto Install. In Cisco UCS, policies are not advisory; they are the source from which fabric interconnects program adapters, boot targets, server identity, firmware, and external integrations. A mismatch between the policy and the actual hardware or upstream storage/network state can cause boot, discovery, KVM, firmware, or connectivity failures. The selected action addresses the object that UCS Manager uses to build the final operational configuration. The distractors either solve a different fault domain or bypass the policy model. A disciplined DCIT validation sequence is to check the fault code, the FSM history, the equipment inventory, the service profile association, and the relevant adapter or boot table. If those states are correct after the change, the UCS component should return to operable service without unnecessary reconfiguration.

Assign the primary template first, and then set the peer name is the appropriate UCS remediation because the symptom maps to a specific managed object rather than a generic server failure. Cisco UCS abstracts hardware through service profiles and policies; therefore, issues involving service profile, vNIC must be corrected where UCS Manager programs the adapter, boot target, firmware, management certificate, pool qualification, or fabric interconnect state. The selected answer restores that programming path. The other options may appear plausible, but they do not correct the object that UCS uses to derive operational state. For example, boot failures require the correct vHBA/iSCSI target and LUN policy, discovery issues require the proper physical and management path, and firmware failures require the documented recovery action for the failed FSM stage. The correct validation is to inspect the associated fault, confirm inventory acknowledgment, verify the policy under the service profile or equipment tree, and then recheck boot or connectivity behavior after the FSM completes.

Associate bashusers with the Cisco NX-OS dev-ops role and activate the bash-shell feature is the required fix because the automation failure is caused by execution context, syntax, or resource state around Bash, Cisco Nexus, Nexus 9000, Cisco Nexus 9000. On Cisco Nexus switches, automation is not a single feature; EEM policies, CLI actions, Guest Shell Linux commands, REST payloads, and scheduled jobs are evaluated by different subsystems. A script can fail even while the switch itself has connectivity or the command works interactively. The selected answer supplies the missing requirement, such as the correct event/action, DNS or resource setting, API URI, payload format, feature enablement, or reboot needed for a Guest Shell change to take effect. The other choices address adjacent features but do not satisfy the failing subsystem. After applying the fix, the engineer should verify the policy registration, job result, API response code, or Guest Shell runtime state and confirm that the intended command is no longer blocked or silently ignored.

The applet called “Backup” must include an action to remove the current static route is the valid corrective action because the failure described is a protocol or fabric state problem, not a generic connectivity issue. For Cisco Nexus, Cisco troubleshooting expects the engineer to compare both endpoints of the relationship: vPC peers must agree on consistency parameters, HSRP peers must exchange hellos in the same VLAN and version context, OSPF/BGP peers must match the attributes required for stable adjacency, and VXLAN EVPN must advertise the correct host or prefix information. The selected option restores that required state. The other options either operate on the wrong layer, change a value that is not used to form the relationship, or would make the peer relationship less deterministic. A clean validation is to inspect the control-plane table first, then verify the forwarding table, and finally test end-to-end traffic. This is the Cisco-preferred approach because it avoids random changes and confirms that the fabric is forwarding based on correct protocol state.

The selected answer, Perform re-acknowledge on the server, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to UCS, UCS Manager, firmware; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

The correct remediation is Add VLAN 88 using switchport trunk allowed VLAN add 88 on VTEP1. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on VXLAN, Cisco Nexus, Nexus 9000, Cisco Nexus 9000, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

The answer is speed auto because Cisco Nexus and ACI forwarding depends on exact agreement between the devices participating in the feature. The scenario references vPC, LACP, Cisco Nexus, Nexus 9000, Cisco Nexus 9000; those technologies fail in predictable ways when required parameters do not match or when the required control-plane advertisement is absent. In DCIT troubleshooting, the engineer should identify the failed dependency, correct that dependency, and then verify the operational table that proves the fix. For example, vPC and EVPN checks focus on consistency, VNI/VRF bindings, peer-gateway behavior, and host-route advertisement; routing checks focus on neighbor state, MTU, timers, authentication, next-hop, and route preference. The selected answer addresses the dependency that blocks forwarding. The distractors are plausible because they touch related features, but they do not resolve the specific failure condition. Post-change validation should include protocol state, learned endpoint or route entries, and a traffic test across the affected path.

The selected answer, Synchronize the date and time to NTP for Cisco UCS Central and the Cisco UCS domains; Allow port 443 between Cisco UCS Manager and Cisco UCS Central, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to UCS, UCS Manager, UCS Central; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

The correct remediation is key1 accept-lifetime 00:00:00 Jun 01 2018 23:59:59 Sep 01 2020. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on HSRP, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

Enable LLDP on the neighbor switch is the correct fix under Cisco SAN troubleshooting practice. The issue described involves VSAN, FCoE, DCBX, LLDP, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

Migrate all virtual machines in the EPG-1 to different port groups is the valid corrective action because the failure described is a protocol or fabric state problem, not a generic connectivity issue. For EPG, VMM, Cisco troubleshooting expects the engineer to compare both endpoints of the relationship: vPC peers must agree on consistency parameters, HSRP peers must exchange hellos in the same VLAN and version context, OSPF/BGP peers must match the attributes required for stable adjacency, and VXLAN EVPN must advertise the correct host or prefix information. The selected option restores that required state. The other options either operate on the wrong layer, change a value that is not used to form the relationship, or would make the peer relationship less deterministic. A clean validation is to inspect the control-plane table first, then verify the forwarding table, and finally test end-to-end traffic. This is the Cisco-preferred approach because it avoids random changes and confirms that the fabric is forwarding based on correct protocol state.

Cisco troubleshooting logic supports the drag-and-drop mapping shown in the answer key as the required fix. In this question the symptoms point to DRAG, DROP, Drag, Not, and the defect is best handled by correcting the exact control-plane or consistency condition. Nexus platforms can show interfaces or peers as configured while still refusing to forward traffic if a vPC Type-1 parameter, VLAN allowance, MTU, HSRP version, EVPN route, or routing attribute is wrong. Cisco methodology is to avoid broad resets unless the state machine is stuck; instead, correct the mismatched parameter and verify that the resulting operational state becomes stable. The other choices do not remove the root cause, or they modify a setting that is not used by the failing protocol exchange. After the change, the engineer should review the peer status, route or MAC table, and counters for drops or inconsistency messages. That sequence proves that the network fabric is fixed, not merely restarted.

Associate security domain TENANT to tenant PROD is correct because the failure is an operations-plane condition involving ACI, RBAC. In Cisco data center products, management functions depend on more than IP connectivity. AAA servers must return the correct attributes, RBAC must map users to the correct security domain or role, certificates must be trusted and valid for the access method, and firmware or registration workflows must satisfy documented prerequisites such as NTP and required ports. The selected answer corrects that dependency. The distractors are not root-cause fixes because they either target a different subsystem or change a setting that would not influence the observed login, registration, warning, or fault. After the change, validation should include a successful login or registration test, review of the audit/fault record, and confirmation that the expected administrative scope is enforced. That approach matches Cisco operational troubleshooting for DCIT environments.

The correct answer is Assign a tenant-admin role to the security domain of the user. Cisco management and operations troubleshooting focuses on control-plane services such as RBAC, AAA, certificates, SNMP, firmware packages, centralized management registration, fault workflows, and node lifecycle state. This item references APIC, VMM, so the selected action fixes the management dependency rather than the data-plane symptom. Cisco platforms often allow basic reachability while a higher-level integration still fails because of time synchronization, certificate trust, role mapping, authorization attributes, feature state, or incomplete lifecycle cleanup. The other options either modify forwarding behavior, adjust the wrong credential or role, or bypass the required operational workflow. The engineer should validate the fix by confirming the management session or registration, checking the relevant fault or audit log, and confirming that the user, node, or integration has the expected role and operational status. This is consistent with Cisco DCIT emphasis on operational evidence before and after the change.

The selected resolution is FCoE license; F-Series module because the failure is in the Fibre Channel/FCoE control path around FCoE. Cisco MDS and Nexus platforms separate configuration from operational state: a VSAN, zone, vFC binding, device alias, or port-security entry can exist in configuration but still fail if it is not active, correctly merged, or allowed on the link. The correct option addresses the fabric condition that prevents communication. The incorrect options are technically adjacent but would not repair the specific dependency; for example, changing unrelated databases or resetting ports without correcting policy leaves the same failure to recur. Cisco SAN troubleshooting therefore starts with port role and VSAN checks, then confirms fabric services such as fcdomain, FSPF, zoning, fabric binding, and name-server information. The expected validation is that the port becomes operational, the initiator and target appear in the appropriate databases, and permitted zone members can communicate.

The correct remediation is The interface policy is misconfigured. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on ACI, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

Reboot the guestshell resolves the problem because the symptom is specific to the automation subsystem handling After, CPU, Resync, Recreate. Nexus automation failures are frequently caused by a missing EEM event statement, absent event-default action, invalid REST path, incorrect JSON or XML syntax, Guest Shell DNS/resource settings, or a scheduler feature that is not enabled. The selected answer corrects that execution prerequisite. The wrong options may make sense for normal switch forwarding, but they do not repair the automation control path. Cisco documentation treats Guest Shell as a separate Linux environment and EEM as a policy engine that can intercept CLI events; both must be validated from their own operational state. A proper verification is to confirm the policy is registered, run the job or API call again, review the response or syslog output, and ensure that normal CLI behavior is preserved after the automation fires.

The correct action is the selected command set. Cisco UCS troubleshooting depends on the relationship between policy, inventory discovery, firmware state, and server identity. The question involves UCS, fabric interconnect, so the selected option fixes the UCS component or policy that directly controls the failure. In UCS Manager, service profiles, vNIC/vHBA templates, boot policies, firmware packages, server pools, adapters, fabric interconnects, and I/O modules are applied through a managed model; a server can fail even when basic IP reachability exists if the relevant policy is incomplete or the hardware inventory has not been acknowledged correctly. The distractors typically change an unrelated object, force a disruptive recovery without fixing the policy, or apply to a different UCS mode. Cisco guidance is to verify faults, FSM stage, inventory status, association status, and the specific boot or connectivity policy before taking action. After the remediation, validate that the fault clears, the FSM completes, and the server or fabric component returns to the expected operable state.

The correct remediation is Disable first-hop redundancy; Filter HSRP traffic by using a Layer 3 VACL on the OTV edge devices. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on OTV, HSRP, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

Implement the consistent NTP source between the appliances is the appropriate UCS remediation because the symptom maps to a specific managed object rather than a generic server failure. Cisco UCS abstracts hardware through service profiles and policies; therefore, issues involving UCS, UCS Manager, UCS Central, certificate must be corrected where UCS Manager programs the adapter, boot target, firmware, management certificate, pool qualification, or fabric interconnect state. The selected answer restores that programming path. The other options may appear plausible, but they do not correct the object that UCS uses to derive operational state. For example, boot failures require the correct vHBA/iSCSI target and LUN policy, discovery issues require the proper physical and management path, and firmware failures require the documented recovery action for the failed FSM stage. The correct validation is to inspect the associated fault, confirm inventory acknowledgment, verify the policy under the service profile or equipment tree, and then recheck boot or connectivity behavior after the FSM completes.

The selected resolution is Enable N9K-1 mode to N-Port ID Virtualization because the failure is in the Fibre Channel/FCoE control path around UCS. Cisco MDS and Nexus platforms separate configuration from operational state: a VSAN, zone, vFC binding, device alias, or port-security entry can exist in configuration but still fail if it is not active, correctly merged, or allowed on the link. The correct option addresses the fabric condition that prevents communication. The incorrect options are technically adjacent but would not repair the specific dependency; for example, changing unrelated databases or resetting ports without correcting policy leaves the same failure to recur. Cisco SAN troubleshooting therefore starts with port role and VSAN checks, then confirms fabric services such as fcdomain, FSPF, zoning, fabric binding, and name-server information. The expected validation is that the port becomes operational, the initiator and target appear in the appropriate databases, and permitted zone members can communicate.

The selected option, event statement, is correct for the automation path described. Cisco NX-OS requires precision in EEM applets, scheduler jobs, Guest Shell operations, and REST/NX-API syntax. The affected element is EEM; therefore, the fix must be applied to the component that actually executes the action. For EEM, that means a valid event detector and explicit actions, with event-default when the matched CLI command should continue. For Guest Shell and Bash, DNS, proxy, resource allocation, and reboot behavior are local to the Linux container. For REST calls, the class name, method, authentication, and XML/JSON structure must match the APIC or NX-OS object model. The distractors usually change the switch globally or alter an unrelated command. Cisco DCIT automation troubleshooting confirms the fix by checking the returned error, then rerunning the exact job, script, or API operation in the same context. The final check is to document the before-and-after state so the remediation is tied to a repeatable Cisco troubleshooting symptom rather than an assumed fix.

Option A resolves the problem because the symptom is specific to the automation subsystem handling Bash, Cisco Nexus. Nexus automation failures are frequently caused by a missing EEM event statement, absent event-default action, invalid REST path, incorrect JSON or XML syntax, Guest Shell DNS/resource settings, or a scheduler feature that is not enabled. The selected answer corrects that execution prerequisite. The wrong options may make sense for normal switch forwarding, but they do not repair the automation control path. Cisco documentation treats Guest Shell as a separate Linux environment and EEM as a policy engine that can intercept CLI events; both must be validated from their own operational state. A proper verification is to confirm the policy is registered, run the job or API call again, review the response or syslog output, and ensure that normal CLI behavior is preserved after the automation fires.

Reset the DIMM is correct because the failure is tied to the UCS managed state of UCS, firmware. In Cisco UCS, policies are not advisory; they are the source from which fabric interconnects program adapters, boot targets, server identity, firmware, and external integrations. A mismatch between the policy and the actual hardware or upstream storage/network state can cause boot, discovery, KVM, firmware, or connectivity failures. The selected action addresses the object that UCS Manager uses to build the final operational configuration. The distractors either solve a different fault domain or bypass the policy model. A disciplined DCIT validation sequence is to check the fault code, the FSM history, the equipment inventory, the service profile association, and the relevant adapter or boot table. If those states are correct after the change, the UCS component should return to operable service without unnecessary reconfiguration.

The answer is Roll back to the original image because Cisco Nexus and ACI forwarding depends on exact agreement between the devices participating in the feature. The scenario references FEX; those technologies fail in predictable ways when required parameters do not match or when the required control-plane advertisement is absent. In DCIT troubleshooting, the engineer should identify the failed dependency, correct that dependency, and then verify the operational table that proves the fix. For example, vPC and EVPN checks focus on consistency, VNI/VRF bindings, peer-gateway behavior, and host-route advertisement; routing checks focus on neighbor state, MTU, timers, authentication, next-hop, and route preference. The selected answer addresses the dependency that blocks forwarding. The distractors are plausible because they touch related features, but they do not resolve the specific failure condition. Post-change validation should include protocol state, learned endpoint or route entries, and a traffic test across the affected path.

The answer is Configure HSRP version 2 on Nexus7K-2 because Cisco Nexus and ACI forwarding depends on exact agreement between the devices participating in the feature. The scenario references HSRP; those technologies fail in predictable ways when required parameters do not match or when the required control-plane advertisement is absent. In DCIT troubleshooting, the engineer should identify the failed dependency, correct that dependency, and then verify the operational table that proves the fix. For example, vPC and EVPN checks focus on consistency, VNI/VRF bindings, peer-gateway behavior, and host-route advertisement; routing checks focus on neighbor state, MTU, timers, authentication, next-hop, and route preference. The selected answer addresses the dependency that blocks forwarding. The distractors are plausible because they touch related features, but they do not resolve the specific failure condition. Post-change validation should include protocol state, learned endpoint or route entries, and a traffic test across the affected path.

The selected answer, Select the " Graceful Maintenance " checkbox; Place each leaf switch in a different upgrade group, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to ACI, UCS, Cisco Nexus; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

Disable the inband-telemetry feature resolves the problem because the symptom is specific to the automation subsystem handling inband-telemetry, packet postcards, Cisco Nexus, Nexus 9000, Cisco Nexus 9000. Nexus automation failures are frequently caused by a missing EEM event statement, absent event-default action, invalid REST path, incorrect JSON or XML syntax, Guest Shell DNS/resource settings, or a scheduler feature that is not enabled. The selected answer corrects that execution prerequisite. The wrong options may make sense for normal switch forwarding, but they do not repair the automation control path. Cisco documentation treats Guest Shell as a separate Linux environment and EEM as a policy engine that can intercept CLI events; both must be validated from their own operational state. A proper verification is to confirm the policy is registered, run the job or API call again, review the response or syslog output, and ensure that normal CLI behavior is preserved after the automation fires.

The correct remediation is The host has not responded to the Control Sub-TLV DCBX exchanges of the switch. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on DCBX, LLDP, Cisco Nexus, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

The selected answer, Change the auto timer to a higher value, then connect the peer switch, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to vPC, Cisco Nexus; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

Assign an MP-BGP AS number to the fabric; Specify the spine nodes as route reflectors is the valid corrective action because the failure described is a protocol or fabric state problem, not a generic connectivity issue. For BGP, ACI, Cisco troubleshooting expects the engineer to compare both endpoints of the relationship: vPC peers must agree on consistency parameters, HSRP peers must exchange hellos in the same VLAN and version context, OSPF/BGP peers must match the attributes required for stable adjacency, and VXLAN EVPN must advertise the correct host or prefix information. The selected option restores that required state. The other options either operate on the wrong layer, change a value that is not used to form the relationship, or would make the peer relationship less deterministic. A clean validation is to inspect the control-plane table first, then verify the forwarding table, and finally test end-to-end traffic. This is the Cisco-preferred approach because it avoids random changes and confirms that the fabric is forwarding based on correct protocol state.

The correct remediation is no bloggerd log-dump sap 351. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on ACL, Manager, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

The selected resolution is Remove all of the local storage that is installed because the failure is in the Fibre Channel/FCoE control path around UCS, UCS Manager, SAN boot. Cisco MDS and Nexus platforms separate configuration from operational state: a VSAN, zone, vFC binding, device alias, or port-security entry can exist in configuration but still fail if it is not active, correctly merged, or allowed on the link. The correct option addresses the fabric condition that prevents communication. The incorrect options are technically adjacent but would not repair the specific dependency; for example, changing unrelated databases or resetting ports without correcting policy leaves the same failure to recur. Cisco SAN troubleshooting therefore starts with port role and VSAN checks, then confirms fabric services such as fcdomain, FSPF, zoning, fabric binding, and name-server information. The expected validation is that the port becomes operational, the initiator and target appear in the appropriate databases, and permitted zone members can communicate.

Configure the Filter field with sAMAccountName=$company is the appropriate UCS remediation because the symptom maps to a specific managed object rather than a generic server failure. Cisco UCS abstracts hardware through service profiles and policies; therefore, issues involving UCS, UCS Manager, LDAP must be corrected where UCS Manager programs the adapter, boot target, firmware, management certificate, pool qualification, or fabric interconnect state. The selected answer restores that programming path. The other options may appear plausible, but they do not correct the object that UCS uses to derive operational state. For example, boot failures require the correct vHBA/iSCSI target and LUN policy, discovery issues require the proper physical and management path, and firmware failures require the documented recovery action for the failed FSM stage. The correct validation is to inspect the associated fault, confirm inventory acknowledgment, verify the policy under the service profile or equipment tree, and then recheck boot or connectivity behavior after the FSM completes.

The selected resolution is Change the name of one of the zones to match the other zone set because the failure is in the Fibre Channel/FCoE control path around MDS. Cisco MDS and Nexus platforms separate configuration from operational state: a VSAN, zone, vFC binding, device alias, or port-security entry can exist in configuration but still fail if it is not active, correctly merged, or allowed on the link. The correct option addresses the fabric condition that prevents communication. The incorrect options are technically adjacent but would not repair the specific dependency; for example, changing unrelated databases or resetting ports without correcting policy leaves the same failure to recur. Cisco SAN troubleshooting therefore starts with port role and VSAN checks, then confirms fabric services such as fcdomain, FSPF, zoning, fabric binding, and name-server information. The expected validation is that the port becomes operational, the initiator and target appear in the appropriate databases, and permitted zone members can communicate.

[ ] fcdomain restart disruptive vsan 5; [ ] fcdomain domain 23 static vsan 5 is the correct fix under Cisco SAN troubleshooting practice. The issue described involves VSAN, FSPF, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

Install the license on the fabric interconnect is the appropriate UCS remediation because the symptom maps to a specific managed object rather than a generic server failure. Cisco UCS abstracts hardware through service profiles and policies; therefore, issues involving UCS, fabric interconnect must be corrected where UCS Manager programs the adapter, boot target, firmware, management certificate, pool qualification, or fabric interconnect state. The selected answer restores that programming path. The other options may appear plausible, but they do not correct the object that UCS uses to derive operational state. For example, boot failures require the correct vHBA/iSCSI target and LUN policy, discovery issues require the proper physical and management path, and firmware failures require the documented recovery action for the failed FSM stage. The correct validation is to inspect the associated fault, confirm inventory acknowledgment, verify the policy under the service profile or equipment tree, and then recheck boot or connectivity behavior after the FSM completes.

Cisco troubleshooting logic supports EVPN Type 1-5 as the required fix. In this question the symptoms point to EVPN, and the defect is best handled by correcting the exact control-plane or consistency condition. Nexus platforms can show interfaces or peers as configured while still refusing to forward traffic if a vPC Type-1 parameter, VLAN allowance, MTU, HSRP version, EVPN route, or routing attribute is wrong. Cisco methodology is to avoid broad resets unless the state machine is stuck; instead, correct the mismatched parameter and verify that the resulting operational state becomes stable. The other choices do not remove the root cause, or they modify a setting that is not used by the failing protocol exchange. After the change, the engineer should review the peer status, route or MAC table, and counters for drops or inconsistency messages. That sequence proves that the network fabric is fixed, not merely restarted.

Remove primaryEncap= " vlan-110 " from the specific port path is the required fix because the automation failure is caused by execution context, syntax, or resource state around APIC, EPG, Postman. On Cisco Nexus switches, automation is not a single feature; EEM policies, CLI actions, Guest Shell Linux commands, REST payloads, and scheduled jobs are evaluated by different subsystems. A script can fail even while the switch itself has connectivity or the command works interactively. The selected answer supplies the missing requirement, such as the correct event/action, DNS or resource setting, API URI, payload format, feature enablement, or reboot needed for a Guest Shell change to take effect. The other choices address adjacent features but do not satisfy the failing subsystem. After applying the fix, the engineer should verify the policy registration, job result, API response code, or Guest Shell runtime state and confirm that the intended command is no longer blocked or silently ignored.

Cisco troubleshooting logic supports Configure a new IP address on the Ethernet interface toward the OSPF neighbor. Clear the OSPF neighbor as the required fix. In this question the symptoms point to OSPF, Cisco Nexus, Nexus 9000, Cisco Nexus 9000, and the defect is best handled by correcting the exact control-plane or consistency condition. Nexus platforms can show interfaces or peers as configured while still refusing to forward traffic if a vPC Type-1 parameter, VLAN allowance, MTU, HSRP version, EVPN route, or routing attribute is wrong. Cisco methodology is to avoid broad resets unless the state machine is stuck; instead, correct the mismatched parameter and verify that the resulting operational state becomes stable. The other choices do not remove the root cause, or they modify a setting that is not used by the failing protocol exchange. After the change, the engineer should review the peer status, route or MAC table, and counters for drops or inconsistency messages. That sequence proves that the network fabric is fixed, not merely restarted.

Reconfigure the initiator and the target to be in the same zones is the correct fix under Cisco SAN troubleshooting practice. The issue described involves The, What, Reconfigure, Reactivate, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

The selected answer, the selected actions, follows Cisco UCS operational logic. UCS Manager is policy-driven, so troubleshooting must determine whether the problem is caused by hardware discovery, service profile association, firmware activation, boot order, storage presentation, or management integration. The scenario points to UCS, firmware, Auto Install, fabric interconnect; that is why the selected action fixes the root condition rather than merely restarting the server. The wrong options either affect a different policy, require unnecessary disruption, or assume that physical connectivity alone is sufficient. Cisco documentation for UCS server boot and firmware management stresses that boot policies must include the correct target details, firmware workflows must complete their FSM stages, and hardware changes often require acknowledgement or re-acknowledgement before UCS Manager uses the new inventory. After remediation, the engineer should confirm that the UCS fault is cleared, the server association or discovery state is complete, and the operating system or management service can use the intended path.

UCS-A# scope fabric-interconnect b UCS-A# /fabric-interconnect # remove service-pack security UCS-A# /fabric-interconnect* # commit-buffer is correct because the failure is tied to the UCS managed state of UCS, fabric interconnect. In Cisco UCS, policies are not advisory; they are the source from which fabric interconnects program adapters, boot targets, server identity, firmware, and external integrations. A mismatch between the policy and the actual hardware or upstream storage/network state can cause boot, discovery, KVM, firmware, or connectivity failures. The selected action addresses the object that UCS Manager uses to build the final operational configuration. The distractors either solve a different fault domain or bypass the policy model. A disciplined DCIT validation sequence is to check the fault code, the FSM history, the equipment inventory, the service profile association, and the relevant adapter or boot table. If those states are correct after the change, the UCS component should return to operable service without unnecessary reconfiguration.

The selected option, Reboot the guest shell, is correct for the automation path described. Cisco NX-OS requires precision in EEM applets, scheduler jobs, Guest Shell operations, and REST/NX-API syntax. The affected element is Guest Shell, Bash, Cisco Nexus; therefore, the fix must be applied to the component that actually executes the action. For EEM, that means a valid event detector and explicit actions, with event-default when the matched CLI command should continue. For Guest Shell and Bash, DNS, proxy, resource allocation, and reboot behavior are local to the Linux container. For REST calls, the class name, method, authentication, and XML/JSON structure must match the APIC or NX-OS object model. The distractors usually change the switch globally or alter an unrelated command. Cisco DCIT automation troubleshooting confirms the fix by checking the returned error, then rerunning the exact job, script, or API operation in the same context.

The correct answer is ( ) On switch-1, run the device-alias rename A3 A123 command. On switch-2, run the device-alias rename A1 A123 command. Cisco MDS and Nexus SAN troubleshooting is driven by fabric state: the host and target must be in the correct VSAN, must complete FLOGI/PLOGI where applicable, and must be permitted by active zoning, fcdomain, FSPF, NPV/NPIV, or port-security policy. This question focuses on MDS, device-alias, so the selected action fixes the dependency that prevents the initiator, target, or inter-switch link from becoming usable. Cisco documentation emphasizes checking VSAN membership, active zonesets, correct port mode, fabric binding, device-alias consistency, and the relevant FC databases before changing unrelated server settings. The distractors either target a different database, use the wrong port role, or would not cause the observed Fibre Channel state to change. After the fix, the engineer should confirm the interface state, FLOGI database, name-server entries, zoneset activation, and successful initiator-to-target reachability with tools such as fcping or fabric show commands.

using a certificate with a password-protected private key is the correct fix under Cisco SAN troubleshooting practice. The issue described involves Cisco IMC, certificate, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

The selected resolution is • Set ESX01_B zone to VSAN 20. • Change vHBA1 to VSAN 20 in Service Profile because the failure is in the Fibre Channel/FCoE control path around VSAN, service profile, vHBA. Cisco MDS and Nexus platforms separate configuration from operational state: a VSAN, zone, vFC binding, device alias, or port-security entry can exist in configuration but still fail if it is not active, correctly merged, or allowed on the link. The correct option addresses the fabric condition that prevents communication. The incorrect options are technically adjacent but would not repair the specific dependency; for example, changing unrelated databases or resetting ports without correcting policy leaves the same failure to recur. Cisco SAN troubleshooting therefore starts with port role and VSAN checks, then confirms fabric services such as fcdomain, FSPF, zoning, fabric binding, and name-server information. The expected validation is that the port becomes operational, the initiator and target appear in the appropriate databases, and permitted zone members can communicate.

The correct action is interface ethernet 1/25 switchport port-security maximum 1 switchport port-security mac-address bbbb.cccc.dd11. Cisco UCS troubleshooting depends on the relationship between policy, inventory discovery, firmware state, and server identity. The question involves UCS, Cisco Nexus, so the selected option fixes the UCS component or policy that directly controls the failure. In UCS Manager, service profiles, vNIC/vHBA templates, boot policies, firmware packages, server pools, adapters, fabric interconnects, and I/O modules are applied through a managed model; a server can fail even when basic IP reachability exists if the relevant policy is incomplete or the hardware inventory has not been acknowledged correctly. The distractors typically change an unrelated object, force a disruptive recovery without fixing the policy, or apply to a different UCS mode. Cisco guidance is to verify faults, FSM stage, inventory status, association status, and the specific boot or connectivity policy before taking action. After the remediation, validate that the fault clears, the FSM completes, and the server or fabric component returns to the expected operable state.

The selected resolution is Change the switch port mode to an E port; Issue the no shutdown command on interface fct ' 24 because the failure is in the Fibre Channel/FCoE control path around MDS, UCS. Cisco MDS and Nexus platforms separate configuration from operational state: a VSAN, zone, vFC binding, device alias, or port-security entry can exist in configuration but still fail if it is not active, correctly merged, or allowed on the link. The correct option addresses the fabric condition that prevents communication. The incorrect options are technically adjacent but would not repair the specific dependency; for example, changing unrelated databases or resetting ports without correcting policy leaves the same failure to recur. Cisco SAN troubleshooting therefore starts with port role and VSAN checks, then confirms fabric services such as fcdomain, FSPF, zoning, fabric binding, and name-server information. The expected validation is that the port becomes operational, the initiator and target appear in the appropriate databases, and permitted zone members can communicate.

The correct remediation is role name User1 no rule 4. In Cisco data center troubleshooting, the first priority is to isolate whether the failure is caused by the underlay, overlay control plane, first-hop gateway behavior, or a consistency parameter. This item is centered on Cisco Nexus, Nexus 9000, Cisco Nexus 9000, so the selected action targets the condition that prevents normal forwarding rather than masking the symptom. Cisco Nexus and ACI guidance treats vPC, VXLAN EVPN, OTV, OSPF, BGP, HSRP, and LACP issues as state-dependent technologies: a neighbor, peer, VLAN, VNI, multicast group, timer, MTU, or policy mismatch can leave the protocol partially operational while traffic is still dropped. The rejected alternatives either change unrelated attributes, introduce a new inconsistency, or affect only a secondary behavior. The operational check after applying the fix should be to confirm adjacency or peer state, validate the relevant route/MAC/endpoint table, and test traffic in the affected VLAN or VRF. This aligns with Cisco DCIT network troubleshooting methodology for isolating control-plane state before changing data-plane policy.

Run the switchport ignore bit-errors command on the interface is the required SAN-side correction. In Cisco storage fabrics, symptoms such as isolated ports, missing targets, failed zone merges, vFC down state, or inaccessible LUNs are rarely solved by changing a random endpoint setting. The engineer must validate the FC control-plane dependency associated with Cisco Nexus: VSAN assignment, trunk allowance, FSPF parameters, fcdomain uniqueness, NPIV support, NPV uplink behavior, DCBX/LLDP negotiation, and active zoning. The selected answer is the one that restores that dependency. Other choices may be valid operational commands in a different failure, but they do not address the precise point where fabric membership or access control is broken. Cisco guidance is to verify the active database and the operational database separately because a configured object is not necessarily active in the fabric. Post-remediation checks should include interface state, VSAN status, FLOGI/PLOGI, zoneset membership, and target visibility from the initiator.

Cisco troubleshooting logic supports N9K2(config)# interface eth1/2 N9K2(config-if)# ip address 172.18.1.200/24 as the required fix. In this question the symptoms point to OSPF, Cisco Nexus, Nexus 9000, Cisco Nexus 9000, and the defect is best handled by correcting the exact control-plane or consistency condition. Nexus platforms can show interfaces or peers as configured while still refusing to forward traffic if a vPC Type-1 parameter, VLAN allowance, MTU, HSRP version, EVPN route, or routing attribute is wrong. Cisco methodology is to avoid broad resets unless the state machine is stuck; instead, correct the mismatched parameter and verify that the resulting operational state becomes stable. The other choices do not remove the root cause, or they modify a setting that is not used by the failing protocol exchange. After the change, the engineer should review the peer status, route or MAC table, and counters for drops or inconsistency messages. That sequence proves that the network fabric is fixed, not merely restarted.

1- Power off the server and disconnect the power cord 2- Confirm that all cards are properly seated 3- Connect the power cord and power on the server is the appropriate UCS remediation because the symptom maps to a specific managed object rather than a generic server failure. Cisco UCS abstracts hardware through service profiles and policies; therefore, issues involving UCS must be corrected where UCS Manager programs the adapter, boot target, firmware, management certificate, pool qualification, or fabric interconnect state. The selected answer restores that programming path. The other options may appear plausible, but they do not correct the object that UCS uses to derive operational state. For example, boot failures require the correct vHBA/iSCSI target and LUN policy, discovery issues require the proper physical and management path, and firmware failures require the documented recovery action for the failed FSM stage. The correct validation is to inspect the associated fault, confirm inventory acknowledgment, verify the policy under the service profile or equipment tree, and then recheck boot or connectivity behavior after the FSM completes.

Remove the LUN ID from the boot policy is the correct fix under Cisco SAN troubleshooting practice. The issue described involves UCS, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

Issue permit distribute on core-2 is the correct fix under Cisco SAN troubleshooting practice. The issue described involves VSAN, Cisco Nexus, Nexus 9000, Cisco Nexus 9000, where the operating state depends on the correct combination of port type, VSAN, fabric service, and access-control database. MDS and Nexus SAN features do not infer missing policy: if the active zoneset, fabric-binding database, fcdomain, NPIV setting, or FCoE/LLDP negotiation is wrong, the link may come up physically but the initiator will not reach the target. The selected answer corrects the missing or mismatched element. The remaining choices either act at the wrong layer, change a non-causal parameter, or provide only a temporary reset. After applying the fix, a proper Cisco validation path is to review show interface, show flogi database, show fcns database, show zoneset active, and any isolation or merge-failure logs. That confirms the storage network is operationally consistent.

The correct answer is Place VLAN 0 on the interface that connects to the storage. Cisco MDS and Nexus SAN troubleshooting is driven by fabric state: the host and target must be in the correct VSAN, must complete FLOGI/PLOGI where applicable, and must be permitted by active zoning, fcdomain, FSPF, NPV/NPIV, or port-security policy. This question focuses on UCS, service profile, iSCSI, so the selected action fixes the dependency that prevents the initiator, target, or inter-switch link from becoming usable. Cisco documentation emphasizes checking VSAN membership, active zonesets, correct port mode, fabric binding, device-alias consistency, and the relevant FC databases before changing unrelated server settings. The distractors either target a different database, use the wrong port role, or would not cause the observed Fibre Channel state to change. After the fix, the engineer should confirm the interface state, FLOGI database, name-server entries, zoneset activation, and successful initiator-to-target reachability with tools such as fcping or fabric show commands.

The answer is Configure a tenant Layer 3 VNI because Cisco Nexus and ACI forwarding depends on exact agreement between the devices participating in the feature. The scenario references VXLAN, VNI; those technologies fail in predictable ways when required parameters do not match or when the required control-plane advertisement is absent. In DCIT troubleshooting, the engineer should identify the failed dependency, correct that dependency, and then verify the operational table that proves the fix. For example, vPC and EVPN checks focus on consistency, VNI/VRF bindings, peer-gateway behavior, and host-route advertisement; routing checks focus on neighbor state, MTU, timers, authentication, next-hop, and route preference. The selected answer addresses the dependency that blocks forwarding. The distractors are plausible because they touch related features, but they do not resolve the specific failure condition. Post-change validation should include protocol state, learned endpoint or route entries, and a traffic test across the affected path.