Alibaba Cloud ACA-Operator Practice Verified Answers - Pass Your Exams For Sure! [2021]
Valid Way To Pass Alibaba System Operator's ACA-Operator Exam
NEW QUESTION 17
Which Alibaba Cloud service is an automated operations and maintenance (O&M) service to execute O&M tasks?
- A. Resource Orchestration Service (ROS)
- B. Resource Access Management (RAM)
- C. Maintenance Orchestration Service (MOS)
- D. Operation Orchestration Service (OOS)
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/120556.htm
NEW QUESTION 18
In order to deal with sudden spikes in traffic, Company A uses Alibaba Cloud Auto Scaling to set up an alarm trigger task (growing the Scaling Group when the average memory utilization on ECS instances exceeds 80%). During the test, it was found that the alarm task was not executed successfully. Which of these could be possible causes? (Number of correct answers: 3)
- A. Before triggering the alarm task, the number of instances in the group has reached the maximum number of instances allowed (MaxSize)
- B. The number of instances in the current group exceeds the "expected number of instances" for the Scaling Group
- C. The ECS instances in the Scaling Group have not yet installed the CloudMonitor monitoring agent
- D. The instance types chosen in the Scaling Configuration are out-of-stock in the Alibaba Cloud Region where the Scaling Group is located
Answer: A,C,D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/74853.htm
NEW QUESTION 19
Which of the following features are unique to Alibaba Cloud Container Registry, as compared with Docker Hub? (Number of correct answers: 2)
- A. For source code hosted on websites outside China, Container Registry can use servers outside China to build Docker images, even when you are using a Container Registry instance in Mainland China.
- B. Container Registry can automatically build new Docker images when source code changes.
- C. You can set your image repository access to public or private.
- D. You can create and delete image repositories in different regions based on your needs.
Answer: A,D
NEW QUESTION 20
Which of the following methods can NOT be used for operating Alibaba Cloud Elastic Compute Service (ECS) instances?
- A. CLI
- B. CloudFormation
- C. Console
- D. SDK
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/25422.htm
NEW QUESTION 21
Alibaba Cloud RocketMQ is typically used in scenarios where message publishing and consumption performance requirements are high. Which of the following are supported message types in Alibaba Cloud RocketMQ? (Number of correct answers: 3)
- A. Batched message
- B. Scheduled message
- C. Retried message
- D. Ordered message
- E. Transactional message
Answer: B,D,E
NEW QUESTION 22
Which of the following fields should be defined in the Alibaba Cloud Terraform Provider Configuration? (Number of correct answers: 3)
- A. access_key
- B. image_id
- C. ecret_key
- D. region
Answer: A,C,D
Explanation:
Explanation
https://www.terraform.io/docs/language/providers/requirements.html
NEW QUESTION 23
Alibaba Cloud Log Service allows you to store and search logs from a variety of sources, but has no built-in visualization capabilities.
- A. False
- B. True
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/102530.htm
NEW QUESTION 24
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. The STS service supports the use of both HTTP and HTTPS protocols
- C. 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
- D. A STS request consists of an access address, communication protocol, request method, request parameters and character encoding
Answer: A,C,D
NEW QUESTION 25
Which of the following statements about ECS Snapshot is NOT correct?
- A. You can roll back a disk by using a snapshot
- B. You can create an ECS instance from a snapshot
- C. You can manually create snapshots
- D. You can create automatic snapshots
Answer: B
Explanation:
Explanation
You can create a custom image from a snapshot that contains the operating system and data of an ECS instance. Then, you can use the custom image to create multiple instances that have identical application environments.
https://www.alibabacloud.com/help/doc-detail/25391.htm
NEW QUESTION 26
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?
- A. Waiting for callback mode
- B. Request response mode
- C. Asynchronous mode
- D. Synchronization mode
Answer: C
Explanation:
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_
NEW QUESTION 27
A developer has written a web application using a microservice architecture, in such an architecture, the client (web browser or mobile application) first initiates a request. The request first reaches the load balancer, then goes through an authentication service, a billing service, then requests a resource, and finally a result is returned. How many spans does such a call chain consist of?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
Explanation
1-request, 2-load balancer, 3-authentication service, 4-billing service, 5-resource request
NEW QUESTION 28
ApsaraDB for HBase is a cost-effective cloud-based intelligent SQL service that is of high scalability and compatible with the open source HBase.
- A. False
- B. True
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/49501.htm
NEW QUESTION 29
Which database utility is suitable for automate perception, healing, optimization, O&M, and security assurance for databases?
- A. DAS
- B. DTS
- C. DMS
- D. DBS
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/64851.htm
NEW QUESTION 30
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?
- A. Requests are forwarded to other normal ECS instances and the unhealthy ECS instance is shutted down
- B. Requests are not forwarded to the ECS instances and you get back a 500 error
- C. Requests are forwarded to other normal ECS instances. When the faulty ECS instance becomes normal, SLB forwards requests to the ECS instance again
- D. Requests are not forwarded to the ECS instances and you get back a 400 error
Answer: C
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/27702.htm
NEW QUESTION 31
Which of these log formats is currently supported by Alibaba Cloud's ActionTrail?
- A. HTML
- B. JSON
- C. XML
- D. Markdown
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/140850.htm
NEW QUESTION 32
Which of these Alibaba Cloud services are used for security (either credentials management, logging, or auditing?) (Number of correct answers: 3)
- A. Key Management Service (KMS)
- B. Log Service
- C. ActionTrail
- D. Table store
Answer: A,B,C
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/27280.htm
NEW QUESTION 33
Which of these are important concepts in Terraform's configuration language, HCL? (Number of correct answers: 3)
- A. Service Mesh
- B. Variable
- C. Resource
- D. Provider
Answer: B,C,D
NEW QUESTION 34
In Alibaba Cloud, a developer finds that the ECS instance he created does not have public IP assigned. The API method used was "CreateInstance". Which of the following is the most likely reason?
- A. The CreateSecurityGroup API call was not made
- B. The ECS was not restarted after being created
- C. The CreateDisk API call was not made
- D. The developer did not call AllocatePublicIpAdress (an additional API call), which is needed to assign a public IP
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/25544.htm
NEW QUESTION 35
Which of the following options are correct for Multipart Upload and Resumable Upload in Object Storage Service (OSS)? (Number of correct answers: 3)
- A. Use Multipart Upload to upload multiple parts of a file in parallel to speed up the upload process
- B. Multipart Upload is usually used when the size of the file to be uploaded is large
- C. If the upload fails due to an accident during the uploading of fragments, you need to upload all the fragments again
- D. 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
NEW QUESTION 36
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)
- A. Message Service provides synchronous notification to ensure the consistency between the message acknowledgment and event processing.
- B. The consumer type of the event notification message can be HTTP Server, Queue, or Topic.
- C. Event Notifications can cross regions.
- D. 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.
Answer: B,D
NEW QUESTION 37
RAM supports custom policies.
- A. True
- B. False
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/93733.htm
NEW QUESTION 38
Resource Management provides a collection of resource management services that support enterprise IT administration.
- A. True
- B. False
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/94475.htm
NEW QUESTION 39
Alibaba Cloud ActionTrail is a service that monitors and records the actions of your Alibaba Cloud account, including the access to and use of cloud products and services through the Alibaba Cloud console, API operations, and SDKs.
- A. True
- B. False
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/28804.htm
NEW QUESTION 40
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