Alibaba Cloud ACA-Developer 問題集

質問 1：
Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)
A. When calling the STS API, in order to ensure the safe calling of the API, Alibaba Cloud will authenticate each API request through a signature when each API call is made
B. A STS request consists of an access address, communication protocol, request method, request parameters and character encoding
C. Through the STS service, RAM users or RAM roles can obtain a temporary token that allows them to call the Alibaba Cloud API or use the web console
D. The STS service supports the use of both HTTP and HTTPS protocols
正解：A,B,D

質問 2：
Which of the following statements about migrating data into and out of Object Storage Service (OSS) are correct? (Number of correct answers: 3)
A. You can migrate data between OSS buckets in any of the following conditions: Buckets are located within the same region, buckets are located across regions and buckets belong to different Alibaba Cloud accounts.
B. You cannot migrate data between OSS buckets if the data at the source is stored in a bucket of the Archive type.
C. A migration job occupies the network resources of the source and the destination. To ensure business continuity, we recommend that you specify a rate limit for a migration Job or run the migration job during an off-peak period.
D. Online migration supports both migrating buckets at a time, and migrating all the data under an Alibaba Cloud account at a single time.
正解：A,B,D

質問 3：
In PolarDB, if an UPDATE SQL statement encounters an issue, you need to check the execution plan to figure out the root cause. However, in the production environment, to avoid affecting the production data, what statement should you use to view the execution plan? (Number of correct answers: 2)
A. explain analyze verbose SQL
B. explain analyze SQL
C. explain SQL
D. explain verbose SQL
正解：B,D

質問 4：
To meet data analytics requirements on large datasets, which of these databases can meet the demand for structured and semi-structured storage for almost all types of data, albeit with limited support for strong transactions?
A. TSDB
B. RDSMariaDB
C. OceanBase
D. HBase
正解：B

質問 5：
When a developer calls the Alibaba Cloud SDK to access Elastic Compute Service (ECS), the following error is returned; RealNameAuthenticationError What is the possible cause?
A. The user's Alibaba Cloud account has not passed real name authentication
B. The API callers account and password are not authorized for ECS access.
C. The ECS instance name violates the ECS service's naming conventions.
D. The ECS instance name conflicts with other instance names.
正解：B

質問 6：
In Alibaba Cloud RocketMQ, messages are kept for up to _____ days. We recommend configuring a monitoring service to watch the consumption status, and intervene manually when ''not consumed but to be deleted'' message alarms occur.
A. 2
B. 3
C. 4
D. 5
正解：B

質問 7：
Which of the following options are correct for Multipart Upload and Resumable Upload in Object Storage Service (OSS)? (Number of correct answers: 3)
A. Multipart Upload is usually used when the size of the file to be uploaded is large
B. If the upload fails due to an accident during the uploading of fragments, you need to upload all the fragments again
C. 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
D. Use Multipart Upload to upload parts of a file in parallel to speed up the upload process
正解：A,B,D

質問 8：
Which of the following are correct, regarding RAM users? (Number of correct answers: 3)
A. RAM users do not "own" the resources that they create (those belong to the Alibaba Cloud account itself), and RAM users cannot generate and pay their own individual bills (costs accrue to and are billed to the master Alibaba Cloud account).
B. RAM users can be created under a single Alibaba Cloud account, corresponding to employees, systems, or applications.
C. RAM users must be authorized by the Alibaba Cloud account to log in to the console or use the API to manage the resources owned by the Alibaba Cloud account.
D. RAM users belong to an Alibaba Cloud account, but they can also operate as independent accounts with their own private resources, not visible to the primary Alibaba Cloud account.
正解：B,C,D

質問 9：
Which of the following detection protocol is NOT supported by CloudMonitor's Site Monitoring feature?
A. DNS
B. HTTP(S)
C. SNMP
D. TCP/UDP
正解：C