[2021] ACA-Operator All-in-One Exam Guide Practice To your ACA-Operator Exam!
Preparations of ACA-Operator Exam 2021 Alibaba System Operator Unlimited 63 Questions
NEW QUESTION 21
Which of these metrics are collected by CloudMonitor's Host Monitoring function? (Number of correct answers: 3)
- A. ECS network I/O
- B. Running processes on the ECS instance
- C. Storage space used by OSS buckets
- D. CPU status of the ECS instance
Answer: A,B,D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/35170.htm
NEW QUESTION 22
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 23
Which of these is NOT a function of CloudMonitor?
- A. Automatically take remedial action when an alarm triggers
- B. Set alarm rules for any of CloudMonitor's metrics
- C. Set notification methods for different alarms
- D. Set the alarm rule effective period (the time during which the alarm may trigger)
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/35170.htm
NEW QUESTION 24
Which of the following engines is NOT supported by PolarDB?
- A. Oracle
- B. MongoDB
- C. PostgreSQL
- D. MySQLo
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/58764.htm
NEW QUESTION 25
Which of the following database connection methods does ApsaraDB for Redis support? (Number of correct answers: 2)
- A. Redis-cli
- B. Sentinel
- C. Aliyun-cli
- D. DMS (Data Management Service)
Answer: A,D
NEW QUESTION 26
Which of the following services is used to establish private network connections between virtual private clouds (VPCs) in different regions, or between VPCs and data centers?
- A. VPN Gateway
- B. CEN (Cloud Enterprise Network)
- C. Express Connect
- D. NAT Gateway
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/59870.htm
NEW QUESTION 27
RAM supports custom policies.
- A. True
- B. False
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/93733.htm
NEW QUESTION 28
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 29
________________ is a fully-managed event-driven computing service that allows you to run code in an elastic and reliable way?
- A. Function Compute
- B. Elastic Compute Service (ECS)
- C. Serverless Workflow
- D. Batch Compute
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/52895.htm
NEW QUESTION 30
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 31
A developer needs to use some sensitive business data and operational data in the process of developing a program, but the data should be protected (encrypted or anonymized) as much as possible. In order to facilitate and secure management of data encryption keys, the developer can use Alibaba Cloud Key Management Service (KMS) envelope encryption technology. Which of these statements is NOT correct, regarding KMS?
- A. Developers can generate a plaintext data key and a ciphertext data key by calling the GenerateDataKey interface.
- B. Envelope encryption is an encryption mechanism similar to digital envelope technology. The technology allows you to store, transfer and use encrypted data by encapsulating their Data Keys (DKs) in an envelope, instead of \y encrypting/decrypting data directly with Customer Master Keys (CMKs).
- C. The master key generated by KMS is also kept by the user.
- D. The user uses the master key created on KMS to encrypt and decrypt the generated data key.
Answer: A,B,D
NEW QUESTION 32
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. Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.
- D. Applies indices to fields to contain many records.
- E. A table should not contaiiAiore than 6 indexed fields.
Answer: A,C,E
NEW QUESTION 33
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 34
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 35
Which of the following Alibaba Cloud services offers a software-defined wide area network (SD-WAN) solution based on cloud-native technologies?
- A. VPN Gateway
- B. Smart Access Gateway (SAG)
- C. NAT Gateway
- D. Content Delivery Network (CDN)
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/69227.htm
NEW QUESTION 36
Which of these services can be used to monitor Alibaba Cloud resources and send alerts? (Number of correct answers: 3)
- A. Cloud Config
- B. CloudMonitor
- C. Object Storage Service (OSS)
- D. ActionTrail
Answer: A,B,D
Explanation:
Explanation
OSS is an object storage service.
NEW QUESTION 37
A developer is making the ModifyDBInstanceSpec API call to change the specifications of an RDS instance, but the operation fails. Why could this be? (Number of correct answers: 3)
- A. The instance has a backup task being executed
- B. The instance is in the "running" state
- C. The targeted RDS instance is a disaster recovery instance
- D. No instance type (specification) was included in the request parameters
Answer: A,C,D
NEW QUESTION 38
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
NEW QUESTION 39
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