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ACA-Operator Alibaba Cloud ACA System Operator Certification Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Alibaba Cloud ACA-Operator ACA System Operator Certification certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 62 questions

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 ECS instances in the Scaling Group have not yet installed the CloudMonitor monitoring agent

B.

Before triggering the alarm task, the number of instances in the group has reached the maximum number of instances allowed (MaxSize)

C.

The instance types chosen in the Scaling Configuration are out-of-stock in the Alibaba Cloud Region where the Scaling Group is located

D.

The number of instances in the current group exceeds the “expected number of instances” for the Scaling Group

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

A.

True

B.

False

Which of the following data volume types is not supported by Elastic Container Instance (ECI)?

A.

EmptyDir

B.

NFS

C.

ConfigFile

D.

FixedVolume

Which of these are important concepts in Terraform’s configuration language, HCL? (Number of correct answers: 3)

A.

Provider

B.

Variable

C.

Resource

D.

Service Mesh

RAM supports custom policies.

A.

True

B.

False

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.

Event Notifications can cross regions.

B.

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

C.

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.

D.

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

Which of these services can be used to monitor Alibaba Cloud resources and send alerts? (Number of correct answers: 3)

A.

CloudMonitor

B.

ActionTrail

C.

Cloud Config

D.

Object Storage Service (OSS)

Which database utility is suitable for automate perception, healing, optimization, O&M, and security assurance for databases?

A.

DMS

B.

DBS

C.

DTS

D.

DAS

Which configuration language does Terraform support?

A.

Python

B.

XML

C.

HCL

D.

YAML

Which command should you run to create the resources described in the Terraform scripts?

A.

terraform init

B.

terraform plan

C.

terraform destroy

D.

terraform apply

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.

Auto Scaling

C.

Resource Orchestration Service (ROS)

D.

Resource Access Management (RAM)

________________ is a fully-managed event-driven computing service that allows you to run code in an elastic and reliable way?

A.

Function Compute

B.

Serverless Workflow

C.

Elastic Compute Service (ECS)

D.

Batch Compute

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.

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

B.

Change the website access mode to HTTPS

C.

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

D.

Use SLB for extra protection

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.

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.

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

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.

True

B.

False

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.

Request response mode

B.

Synchronization mode

C.

Asynchronous mode

D.

Waiting for callback mode

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

Resource Management provides a collection of resource management services that support enterprise IT administration.

A.

True

B.

False

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Total 62 questions
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