100% Free ACA-Operator Exam Dumps Use Real Alibaba System Operator Dumps With 63 Questions!
Pass Your ACA-Operator Exam Easily With 100% Exam Passing Guarantee [2022]
Alibaba Cloud ACA-Operator Exam Syllabus Topics:
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NEW QUESTION 25
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: A
Explanation:
Explanation
1-request, 2-load balancer, 3-authentication service, 4-billing service, 5-resource request
NEW QUESTION 26
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 targeted RDS instance is a disaster recovery instance
- B. The instance has a backup task being executed
- C. No instance type (specification) was included in the request parameters
- D. The instance is in the "running" state
Answer: A,B,C
NEW QUESTION 27
Which of the following statements about ECS Snapshot is NOT correct?
- A. You can manually create snapshots
- B. You can create automatic snapshots
- C. You can roll back a disk by using a snapshot
- D. You can create an ECS instance from a snapshot
Answer: D
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 28
You are responsible for the system operations of a product and have implemented the cloud infrastructure in the Alibaba Cloud platform. When business loads increase, _______ automatically adds ECS instances to ensure sufficient computing capabilities. When business loads decrease, the same service automatically removes ECS instances to save costs. Which service are you using?
- A. Server Load Balancer (SLB)
- B. Resource Orchestration Service (ROS)
- C. Resource Access Management (RAM)
- D. Auto Scaling
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/25857.htm
NEW QUESTION 29
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. The number of instances in the current group exceeds the "expected number of instances" for the Scaling Group
- B. The instance types chosen in the Scaling Configuration are out-of-stock in the Alibaba Cloud Region where the Scaling Group is located
- C. The ECS instances in the Scaling Group have not yet installed the CloudMonitor monitoring agent
- D. Before triggering the alarm task, the number of instances in the group has reached the maximum number of instances allowed (MaxSize)
Answer: B,C,D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/74853.htm
NEW QUESTION 30
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. The user uses the master key created on KMS to encrypt and decrypt the generated data key.
- 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. Developers can generate a plaintext data key and a ciphertext data key by calling the GenerateDataKey interface.
Answer: A,B,D
NEW QUESTION 31
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. Synchronization mode
- B. Waiting for callback mode
- C. Request response mode
- D. Asynchronous mode
Answer: D
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 32
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. CEN (Cloud Enterprise Network)
- B. NAT Gateway
- C. Express Connect
- D. VPN Gateway
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/59870.htm
NEW QUESTION 33
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. False
- B. True
Answer: B
NEW QUESTION 34
Which database utility is suitable for managing databases in a centralized manner?
- A. DAS
- B. DBS
- C. DTS
- D. DMS
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/47550.htm
NEW QUESTION 35
Which of the following options correctly describes CloudMonitor Custom Monitoring and Custom Events?
(Number of correct answers: 2)
- A. Custom Monitoring is used for collection of non-continuous event data, such as information about ECS instance restarts
- B. Custom Events is used for collection of continuous event type data, queries, and alarms
- C. Custom Events is for periodic and continuous collection of time series monitoring data, queries, and alarms
- D. Custom Monitoring is used for periodic and continuous collection of time series monitoring data, queries, and alarms
Answer: B,D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/35170.htm
NEW QUESTION 36
Alibaba Cloud CloudMonitor is a service that monitors Alibaba Cloud resources and internet applications.
Which of the following functions are provided by CloudMonitor? (Number of correct answers: 4)
- A. Cloud product monitoring
- B. Site monitoring
- C. Custom monitoring
- D. Alerts
- E. Custom firewall
Answer: A,B,C,D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/35170.htm
NEW QUESTION 37
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?
- A. Change the website access mode to HTTPS
- B. Enable "Hotlink protection" of OSS and use an HTTP Referer whitelist to prevent unauthorized users from accessing your data
- C. Migrate music files from the OSS to the data disks for ECS instances
- D. Use SLB for extra protection
Answer: D
Explanation:
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
NEW QUESTION 38
Which of the following web applications are suitable for deployment on Simple Application Server (SAS), as compared with ECS? (Number of correct answers: 3)
- A. Quickly build serverless site using Function Compute
- B. Quickly build a small e-commerce website
- C. Quickly build a personal blog website
- D. Quickly build a personal, learning, or test environment
- E. Set up a NoSQL database service
Answer: B,C,D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/58620.htm
NEW QUESTION 39
Which of the following descriptions of the principles of Alibaba Cloud SSL certificate private key protection is correct?
- A. Alibaba Cloud Certificate Service uses symmetric encryption to save the certificate private key.
- B. Alibaba Cloud uses the built-in functionality of the SSL certificate service to encrypt and store the private key to ensure the security of your certificate's private key
- C. Alibaba Cloud Certificate Service keys are loaded into memory in plaintext format ONLY when needed.
- D. The plaintext of Alibaba Cloud's private key is usually stored on disk and backed up regularly
Answer: C
NEW QUESTION 40
How does Cloud Config get permission to gather information about other Alibaba Cloud services?
- A. An Access Key
- B. It gets automatic permission to access everything, because it is an Alibaba Cloud service
- C. By storing a copy of your password
- D. A RAM Role
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/156642.htm
NEW QUESTION 41
Which of the following data volume types is not supported by Elastic Container Instance (ECI)?
- A. FixedVolume
- B. EmptyDir
- C. NFS
- D. ConfigFile
Answer: A
Explanation:
Explanation
FlexVolume is the correct one
https://www.alibabacloud.com/help/doc-detail/90672.htm
NEW QUESTION 42
Which of the following engines is NOT supported by PolarDB?
- A. Oracle
- B. MySQLo
- C. PostgreSQL
- D. MongoDB
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/58764.htm
NEW QUESTION 43
Which command should you run to create the resources described in the Terraform scripts?
- A. terraform init
- B. terraform plan
- C. terraform apply
- D. terraform destroy
Answer: C
Explanation:
Explanation
https://www.terraform.io/docs/cli/commands/apply.html
NEW QUESTION 44
Your company decided to replicate the whole cloud environment in another region and use it as a cross-region failover in disaster recovery scenarios.
Your current environment includes Elastic Compute Service (ECS) instances, Server Load Balancer (SLB) instances and Relational Database Service (RDS) instances. Which of the following statements is correct?
- A. You can provision multiple ECS instances in multiple regions, thereby leveraging automatic high availability across regions
- B. You can use DNS to resolve domain names to the IP addresses of multiple ECS instances running in different regions
- C. You can provision multiple SLB instances in multiple regions, thereby leveraging automatic high availability across regions
- D. You can use DNS to resolve domain names to the IP addresses of multiple SLB instances running in different regions
Answer: D
Explanation:
Explanation
https://cloudacademy.com/course/alibaba-server-load-balancer-1066/alibabas-high-availability/
NEW QUESTION 45
Which of the following database connection methods does ApsaraDB for Redis support? (Number of correct answers: 2)
- A. DMS (Data Management Service)
- B. Redis-cli
- C. Sentinel
- D. Aliyun-cli
Answer: A,B
NEW QUESTION 46
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 47
RAM supports custom policies.
- A. False
- B. True
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/93733.htm
NEW QUESTION 48
Which of the following options are correct for Multipart Upload and Resumable Upload in Object Storage Service (OSS)? (Number of correct answers: 3)
- A. If the upload fails due to an accident during the uploading of fragments, you need to upload all the fragments again
- B. Multipart Upload is usually used when the size of the file to be uploaded is large
- 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 multiple parts of a file in parallel to speed up the upload process
Answer: B,C,D
NEW QUESTION 49
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