최신 ACA-Developer 무료덤프 - Alibaba Cloud ACA Developer Certification

문제1

When you use SQL statements to access tables in a database without an index configured, a full table scan will be performed. If a table contains a large amount of data, this kind of scan will access a large amount of data and consume a lot of the database's resources. Which of the following options are best practices when creating database indexes? (Number of correct answers: 3)

A. Apply indexing to fields of fixed length (preferably not long fields).

B. Adhere to the rightmost prefix principle when using composite indexes.

C. table should not contain more than 6 indexed fields.

D. Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.

E. Applies indices to fields that contain many records.

정답: A,D,E

문제2

When connecting to the Alibaba Cloud RDS database, in order to improve the completeness and integrity of the connection, you can enable SSL encryption and install an SSL CA certificate for the required application service. Which of the following statements are correct? (Number of correct answers: 3)

A. When using read/write splitting, you can also enable SSL encryption to improve the security of the connection.

B. Due to the way in which SSL encryption is implemented, enabling SSL encryption will significantly increase the CPU usage rate. Enable SSL encryption when there is an encryption requirement for the external network link. The intranet link is relatively safe, and generally no link encryption is required.

C. It is discovered that an Alibaba Cloud RDS SSL certificate is about to expire, and the validity period needs to be updated, requiring that the certificate be updated, then reinstalled. This will restart the RDS instance.

D. If the RDS instance is a multi-node instance, the system will trigger the active/standby switch after the SSL service is disabled.

정답: A,B,D

문제3

Alibaba Cloud Log Service is a Pay-As-You-Go service. The billing unit is 7 day, and the configuration can be adjusted at any time: fees are charged according to actual usage. Which of the following are the main charges for Log Service? (Number of correct answers: 3)

A. Read and write traffic

B. Index traffic after index configuration

C. Query analysis

D. Storage capacity

정답: A,B,D

문제4

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. 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.

C. Online migration supports both migrating buckets at a time, and migrating all the data under an Alibaba Cloud account at a single time.

D. You cannot migrate data between OSS buckets if the data at the source is stored in a bucket of the Archive type.

정답: A,C,D

문제5

A developer is writing logs through the Log Service API, and can see via the Logstore monitorin metrics that write traffic is about 10 MB/s, but a 403 error is reported during the writing process. Which of these is a possible cause?

A. The target partition in the Logstore is not specified

B. There is not enough space in the Logstore partition

C. There is significant network delay

D. The write throughput of a single partition is limited, and the 10 MB/s write traffic exceeds

정답: A

문제6

A developer runs a web application on a physical machine in an IDC. The machine is running Ubuntu Linux.
Which of the following is the recommended method if he wants to migrate this web application onto an Alibaba Cloud ECS instance?

A. 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.

B. 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.

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.

정답: B

문제7

Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)

A. 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

B. A STS request consists of an access address, communication protocol, request method, request parameters and character encoding

C. The STS service supports the use of both HTTP and HTTPS protocols

D. 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

정답: B,C,D

문제8

A certain project of Enterprise A (called Project-X) moves to the cloud and will need to use a variety of s Alibaba Cloud resources, such as ECS instances, RDS instances, SLB instances, and OSS storage space. There are multiple employees on the project who need to operate these cloud resources. Because each employee has different job responsibilities and requires different permissions, what is the WRONG approach to resource management?

A. When there are multiple RAM users under a cloud account, create user groups to classify and authorize RAM users with the same responsibilities

B. When creating RAM for users, give each user both web console AND AccessKey credentials: there is no need to keep these separate

C. Create RAM users each employee, and set login passwords or create AccessKey credentials as needed

D. Use system policies to bind reasonable permissions policies to users or user groups, and customize policies for more fine-grained control

정답: C

문제9

By default, Function Compute creates an instance for each request Function compute allows you to create multiple instances concurrently to reduce costs and improve execution efficiency Which of the following scenarios is NOT suitable for enabling the feature of handling multiple requests on a single instance? (Number of correct answers: 2)

A. Functions processes independent data objects.

B. The function has a shared state and cannot be accessed concurrently.

C. Requests are waiting for responses from the downstream service for an extended period of time.

D. A request consumes a large amount of CPU and memory resources.

정답: B,C

문제10

Which of the following options is not included in Object Storage Service (OSS) object URLs?

A. Bucket name

B. Region name

C. Filename

D. Zone name

정답: B

최신 ACA-Developer 무료덤프 - Alibaba Cloud ACA Developer Certification

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