ACA-Developer ACA Developer Certification Questions and Answers

For ECS, CloudMonitor supports the collection and reporting of important ECS operating system level events, such as application crashes.

For Object Storage Service (OSS), CloudMonitor supports the collection and reporting of bucket upstream and downstream bandwidth which exceeds the flow control threshold or the user-selected reporting threshold.

For Server Load Balancer (SLB), CloudMonitor supports the collection and reporting of HTTPS certificate expiration events, for certificates installed on SLB.

For E-MapReduce, CloudMonitor supports the collection and reporting of service component status, cluster creation failure, and timeout events.

Simple Upload

Form Upload

Multipart Upload

Append Upload

Use Multipart Upload to upload parts of a file in parallel to speed up the upload process

Multipart Upload is usually used when the size of the file to be uploaded is large

If the upload fails due to an accident during the uploading of fragments, you need to upload all the fragments again

After an upload is interrupted, the portions of the file which have successfully uploaded prior to the interruption will be saved in the OSS bucket

A visitor's real IP address can only be obtained by modifying the site or web application.

A visitor's real IP address is stored in the "X-Forwarded-For" HTTP header It can be directly obtained via Apache or NGINX logs.

In Windows, if IIS is used, after installing the "F5XForwardedFor" extension module, the visitor's real IP address can be seen via IIS logs.

You can activate the "record visitor's real IP" function in the Alibaba Cloud CDN console, then you can directly view visitor's IP addresses from the Alibaba Cloud CDN access logs.

vpcld

vSwitchlds

securityGroupId

ENIID

Elastic Compute Service (ECS)

Object Storage Service (OSS)

Relational Database Service (RDS)

Server Load Balancer (SLB)

The ECS instance name violates the ECS service's naming conventions.

The ECS instance name conflicts with other instance names.

The user's Alibaba Cloud account has not passed real name authentication

The API callers account and password are not authorized for ECS access.

Scheduled message

Ordered message

Batched message

Transactional message

Retried message

Select multiple VPCs when creating the scaling group

When creating the scaling group, select multiple Vswitches in multiple Zone within a Region

Choose a variety of different ECS types when creating your Scaling Configuration

In the process of creating a Scaling Group, associate multiple Server Load Balancers

access.keyjd

access.key.secret

regionjd

zone jd

vpcjd

The code for the application will have to be rewritten once this migration is complete.

The database account used for data migration must have read and write permissions. To ensure database security, please delete the database account used for data migration or reclaim related write permissions after data migration is completed.

After disconnecting the connection between the source instance database B and the application, you need to log in to the source database B to check the session messages to ensure that no new sessions performed write operations.

Create a reverse data migration task and start it to migrate subsequent incremental data from target Instance database B to source instance database B.