ACA-Developer Practice Exam Questions and Answers

A.  

A snapshot is a backup file of the cloud disk data state at a certain point in time. The first snapshot of the cloud disk is a full snapshot of the ac usage. Empty data blocks are not backed up. All subsequent snapshots are incremental snapshots, and only changed data blocks are stored.

B.  

Snapshots can be created manually through the web console or command line tools, or automatically according to a schedule.

C.  

In the event of a system failure, you can use a snapshot to roll back the Cloud Disk to an earlier point in time.

D.  

Snapshot rollbacks can be performed while the ECS instance is running.

A.  

OSS

B.  

RDS

C.  

Redis

D.  

Log Service

A.  

HBase

B.  

OceanBase

C.  

RDSMariaDB

D.  

TSDB

A.  

Select multiple VPCs when creating the scaling group

B.  

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

C.  

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

D.  

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

A.  

vpcld

B.  

vSwitchlds

C.  

securityGroupId

D.  

ENIID

A.  

The "Topic" data field is empty

B.  

The log size written to log group is less than 5MB

C.  

The target partition in the Logstore is not specified

D.  

Insufficient space in the Logstore partition

A.  

Vhost

B.  

Exchange

C.  

Queue

D.  

Broker

E.  

Topic

A.  

Object ACL is an object-level (not bucket level) permission control mechanism. There are currently three levels of access rights: private, public-read, and public-read-write.

B.  

"Private" indicates that an object is a private resource, that is, only the owner of the object has read and write permissions on the object, and other users can read but have no permission to modify or delete the object.

C.  

If the permissions of an object are not set, the permissions of the object are inherited from the bucket.

D.  

You can set the ACL associated with an object by examining the X-OSS-Object-ACL header in the HEAD request, when making the PutObjectACL API call.

A.  

Use a third-party image creation tool to create an image from the physical server. Upload the image to the ECS console to turn it into a custom image. Then, use the custom image to create ECS instances.

B.  

Use SMC(Server Migration Center) to collect data from the origin physical server. Create an intermediate ECS instance on Alibaba Cloud and wait for the data transfer to complete. Then generate a new image directly from that intermediate ECS instance.

C.  

Use a third-party image creation tool to create an image from the physical server. The image is then uploaded to Alibaba Cloud Object Storage Service (OSS) for storage. In the ECS console, import that image from OSS, then, create an ECS instance from the custom image.

A.  

Custom Events are used for collection of continuous event type data, queries, and alarms.

B.  

Custom Events is for periodic and continuous collection of time series monitoring data, queries, and alarms.

C.  

Custom Monitoring is used for periodic and continuous collection of time series monitoring data, queries, and alarms.

D.  

Custom Monitoring is used for collection of non-continuous event data, such as information about ECS instance restarts.

A.  

Improve the query efficiency SELECT statements.

B.  

Improve the efficiency of DML operations such as UPDAT

E.  

C.  

Improve the efficiency of DDL operations.

D.  

Reduce invalid data scanning.

A.  

3

B.  

4

C.  

5

D.  

6

A.  

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

B.  

The ECS instance name conflicts with other instance names.

C.  

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

D.  

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

A.  

RAM Policy

B.  

STS authorization

C.  

Bucket Policy

D.  

Object Policy