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ACA System Operator Certification Questions and Answers

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Questions # 1:

Which of these Alibaba Cloud services are used for security (either credentials management, logging, or auditing?) (Number of correct answers: 3)

Options:

ActionTrail

Log Service

Key Management Service (KMS)

Table store

Answer

A, B, C

Explanation

https://www.alibabacloud.com/help/doc-detail/27280.htm

Questions # 2:

You can create an event notification rule in Message Service and push notifications to the specified consumer in the form of messages, to receive events from specified Alibaba Cloud resources. Which of the following options are correct statements about the Message Service (MS) service? (Number of correct answers: 2)

Options:

Event Notifications can cross regions.

Message Service provides synchronous notification to ensure the consistency between the message acknowledgment and event processing.

The event notification message is retained within the valid time. When you fail to receive an event message, the event notification message is retained based on the specified retry policy.

The consumer type of the event notification message can be HTTP Server, Queue, or Topic.

Answer

C, D

Questions # 3:

Alibaba Cloud Log Service allows you to store and search logs from a variety of sources, but has no built-in visualization capabilities.

Options:

True

False

Answer

Explanation

https://www.alibabacloud.com/help/doc-detail/102530.htm

Questions # 4:

Which of the following fields should be defined in the Alibaba Cloud Terraform

Provider Configuration? (Number of correct answers: 3)

Options:

image_id

access_key

ecret_key

region

Answer

B, C, D

Explanation

https://www.terraform.io/docs/language/providers/requirements.html

Questions # 5:

When using Alibaba Cloud CDN, a visitor's request will first be routed to a CDN edge node, and in the event of a cache miss at this edge node, the node will fetch data from the origin site (back-to-source request). Even with this redirection, it is possible for the origin site to see the visitor's real IP address. Which of the following statements about obtaining the visitor's real IP address are correct? (Number of correct answers: 2)

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

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

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

D. 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.

Options:

Answer

Answer:

B, C

Questions # 6:

A company is developing a music application based on OSS and ECS, their users can download mp3 files after signing up for the application. Recently, the public network traffic to the OSS has doubled but the increase of registered users is less than 10%. After in-depth analysis, system operators find that many download requests are requested from the external search engine. In this case, which of the following measures is thought to be able to address this issue?

Options:

Migrate music files from the OSS to the data disks for ECS instances

Change the website access mode to HTTPS

Enable “Hotlink protection” of OSS and use an HTTP Referer whitelist to prevent unauthorized users from accessing your data

Use SLB for extra protection

Answer

Explanation

You can configure a HTTP Referer whitelist for a bucket to prevent extra fees

caused by unauthorized access to the bucket.

https://www.alibabacloud.com/help/doc-detail/31901.htm

Questions # 7:

After you enable health checks of Server Load Balancer (SLB), when one backend ECS instance is declared as unhealthy, which of the following statements is correct?

Options:

Requests are forwarded to other normal ECS instances and the unhealthy ECS instance is shutted down

Requests are forwarded to other normal ECS instances. When the faulty ECS instance becomes normal, SLB forwards requests to the ECS instance again

Requests are not forwarded to the ECS instances and you get back a 400 error

Requests are not forwarded to the ECS instances and you get back a 500 error

Answer

Explanation

https://www.alibabacloud.com/help/doc-detail/27702.htm

Questions # 8:

Which of the following options are correct for Multipart Upload and Resumable Upload in Object Storage Service (OSS)? (Number of correct answers: 3)

Options:

Use Multipart Upload to upload multiple 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

Answer

A, B, D

Questions # 9:

Serverless Workflow allow you to orchestrate distributed tasks in sequence, branch, and parallel modes, and ensure that tasks are reliably coordinated according to your workflow logic. Which of the following service integration modes is not supported by Serverless Workflow?

Options:

Request response mode

Synchronization mode

Asynchronous mode

Waiting for callback mode

Answer

Explanation

Asynchronous mode is only possible with the combination of MNS service.https://static-aliyun-doc.oss-cnhangzhou.aliyuncs.com/download%2Fpdf%2F122479%2FBest_Practices_intl _en-US.pdf

Questions # 10:

Which configuration language does Terraform support?