VNX100 Versa Certified SD-WAN Associate Questions and Answers

In a Versa Secure SD-WAN solution configured with a Full Mesh topology, the true statement is that CPE devices send SLA probes on all possible transport paths between devices (B). This approach ensures any-to-any communication among branches, enabling direct communication using overlay tunnels without the need to transit through a hub or centralized site. SLA monitoring probes are utilized to track reachability and to measure link metrics for each access circuit towards any given remote site. These probes are critical for maintaining high-quality communication paths and for implementing traffic steering based on predefined SLA parameters​​.

An SD-WAN Forwarding Profile is a set of rules that determine how outgoing traffic should be handled within the SD-WAN network. It particularly defines which WAN links should be selected for forwarding the traffic based on certain criteria such as link performance, priority, and SLA compliance. The Forwarding Profile ensures that traffic is directed over the most appropriate link, which may involve decisions based on the link's performance metrics like latency, jitter, or packet loss, ensuring efficient and optimal use of the WAN infrastructure​​.

In a Versa Secure SD-WAN deployment, the following statements about traffic forwarding are accurate:

• By default, all data traffic is forwarded on IPSec tunnels (Answer A): Versa SD-WAN solutions typically encrypt all data traffic by default using IPSec tunnels. This security measure ensures that data remains protected while transiting over the public or private WAN, safeguarding against eavesdropping and data theft.
• By default, all control traffic is forwarded on IPSec tunnels (Answer B): Similarly, control traffic in Versa SD-WAN is also encrypted and sent through IPSec tunnels. This practice secures the signaling and management traffic, preventing potential attacks that could target the network’s control plane.

Options C (By default, all data traffic is forwarded on unencrypted tunnels) and D (By default, all control traffic is forwarded on unencrypted tunnels) are incorrect as they contradict the security-oriented design of Versa SD-WAN, which emphasizes the encryption of both data and control traffic by default.

References:This explanation utilizes Versa SD-WAN's documented security features and general network security protocols that prioritize encrypted communications for both data and control planes.

When changes to a device configuration are made in the Versa Director through templates, it is crucial to ensure that these changes propagate to the actual branch device. The correct steps involve:

• Committing the Device Template configuration to the appliance (Answer B): This step is necessary because any changes made in the device template need to be actively committed to ensure they are pushed to the specific branch device orappliances that are associated with this template. This action updates the appliance with the latest configuration details, including the static IP address changes for the WAN link.
• Updating the Device Bind Data in Workflows with the IP address and gateway of the Internet WAN link (Answer D): This involves updating the binding configurations that specifically tie device templates to actual hardware or site-specific configurations. It is essential when changes such as IP addressing are involved, as the binding data must accurately reflect the network topology and addressing used by the devices.

References:The detailed steps and necessity for these actions are derived from standard Versa SD-WAN configuration practices as reflected in the comprehensive Versa configuration manuals and best practices documents available through Versa Networks Academy Library and configuration guides.

The default load balancing algorithm set in an SD-WAN Forwarding Profile is Weighted Round Robin (WRR). This algorithm assigns weights to each path based on the available bandwidth on the access circuit. WRR is recommended when paths with equal priorities are provisioned with different bandwidths, ensuring that traffic is distributed proportionally to the bandwidth of each path, which optimizes the utilization of network resources and maintains load balancing across the WAN circuits​​.

When a CPE device appears in the unknown device list in Versa Director Inventory during Zero Touch Provisioning (ZTP), it typically indicates a discrepancy in device identification details. Specifically,the device workflow configuration not having the correct serial number of the CPE defined (Answer C)can lead to this issue. The workflow configuration must accurately include the serial number so that Versa Director can recognize and authenticate the device as part of the organization’s network infrastructure. If the serial number in the workflow configuration does not match the serial number of the actual device, the Director will not be able to properly identify and classify the device, thus placing it in the unknown device list.

References:Versa’s official documentation on ZTP outlines the importance of accurate device identifiers in the workflow configuration to ensure successful device onboarding and recognition by the Versa Director.

A Versa Workflow is a process within Versa Director that automates the creation or modification of objects, such as device templates, policies, and service profiles. Workflows streamline complex configurations, guiding administrators through a series of steps to configure devices, apply policies, and set up services across the SD-WAN infrastructure. It simplifies and accelerates the deployment and management of the SD-WAN solution.

Versa Analytics has the capability to not only generate customized daily reports on bandwidth usage for all sites in the network but also to schedule these reports to be sent via email. This function allows administrators to receive reports without having to log into the Versa Analytics portal, streamlining the process and ensuring that they have the necessary information on a regular basis​​.

To apply a new URL filtering profile across all of the SD-WAN CPEs in response to a security event, you would use the Next Generation Firewall (NGFW) Template. This template is specifically designed to handle security functions, including application control, intrusionprevention, and URL filtering. By using the NGFW Template, you can enforce URL filtering policies that block or allow traffic based on URLs and categories, which is integral to controlling access to websites and ensuring network security​​.

In a Post-staging Template within the Versa SD-WAN solution, device-specific information such as WAN IP addresses, LAN subnets, and route ID are collectively referred to as "Bind Data". This term is used to describe the information that is specific to individual devices, which must be entered to tailor the general staging template to the unique requirements of each device during the staging process.

In the architecture of Versa SD-WAN, the control plane plays a crucial role in the discovery and management of network topology:

• SD-WAN topology is discovered using MP-iBGP (Answer B): Versa utilizes Multi-Protocol Interior Border Gateway Protocol (MP-iBGP) for the discovery and management of the SD-WAN topology. This protocol helps in the efficient exchange of routing information within the network, enabling the Versa Director and other network components to maintain an updated view of network topology.
• Versa Private Address Family is used to advertise topology information (Answer C): This unique address family within Versa’s ecosystem is specifically designed to handle and distribute topology information across the network. It ensures that all relevant Versa devices are aware of the network structure and any changes to it.

References:These elements of Versa’s SD-WAN control plane are detailed in the technical specifications and white papers provided by Versa Networks, which explain the underlying mechanisms that support network operations and topology management within Versa’s infrastructure.

Versa Secure Access (VSA) is designed to integrate with various authentication servers, including LDAP, and supports multifactor authentication methods like email and time-based OTP, integrating with authentication applications such as Duo, Google Authenticator, and Microsoft Authenticator. This makes the platform versatile in terms of supporting different enterpriserequirements for user authentication and enhancing security.​

If the console cable is missing during the unboxing of an SD-WAN CPE for script-based provisioning, the engineer can initiate the provisioning process by connecting a laptop to the management port on the device. The management port provides a direct interface for configuration tasks, allowing the engineer to access the device's command-line interface without the need for the standard console connection.​

Service templates are used to apply an identical QoS configuration to multiple CPEs, ensuring consistent quality of service across the network. Additionally, these templates are also employed to share an identical service configuration across different tenants within a multi-tenant architecture, ensuring uniform policy application while maintaining tenant separation.

Versa Analytics and Versa Director support REST APIs, which allow integration with third-party applications and systems. The REST APIs provided by these components enable automation and programmability for various network management and analytics functions. Versa Controller and Versa CPE are not referenced in the provided documents as supporting REST APIs directly, although they interact with Versa Director, which does.​