Latest [Oct 04, 2021] ACA-Operator Exam with Accurate ACA System Operator Certification PDF Questions
Take a Leap Forward in Your Career by Earning Alibaba Cloud 63 Questions
NEW QUESTION 13
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 is stored in the "X-Forwarded-For" HTTP header. It can be directly obtained via Apache or NGINX logs.
- B. In Windows, if IIS is used, after installing the "F5XForwardedFor" extension module, the visitor's real IP address can be seen via IIS logs.
- C. 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.
- D. visitor's real IP address can only be obtained by modifying the site or web application.
Answer: A,B
NEW QUESTION 14
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. Resource Orchestration Service (ROS)
- B. Auto Scaling
- C. Resource Access Management (RAM)
- D. Server Load Balancer (SLB)
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/25857.htm
NEW QUESTION 15
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 16
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 17
________________ 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 18
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 19
A Developer is creating a Function Compute function. This function requires around 1 GB of temporary storage for files while executing. These files will not be needed after the function is completed for a fixed period. How can this developer MOST efficiently handle the temporary files?
- A. Store the files in the /tmp directory on a temporary ECS instance, and delete the files at when the Function Compute function call completes.
- B. Store the files in Cloud Disk and delete the files when Function Compute function call completes.
- C. Copy the files to an OSS bucket with a lifecycle policy configured to delete the files automatically.
- D. Copy the files to NFS and delete the files when the Function Compute function call completes.
Answer: C
NEW QUESTION 20
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 21
RAM supports custom policies.
- A. True
- B. False
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/93733.htm
NEW QUESTION 22
PolarDB supports three engines: MySQL, PostgreSQL and Oracle.
- A. False
- B. True
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/58764.htm
NEW QUESTION 23
Tracing Analysis is used to analyze and diagnose performance bottlenecks in a distributed application architecture and make microservice development and diagnostics more efficient.
- A. True
- B. False
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/90277.htm
NEW QUESTION 24
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 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: C
Explanation:
Explanation
1-request, 2-load balancer, 3-authentication service, 4-billing service, 5-resource request
NEW QUESTION 26
Which of the following steps is NOT mandatory when creating an API through Alibaba Cloud API Gateway?
- A. Attach a domain name
- B. Define API Request parameters
- C. Define basic API information
- D. Define the API backend service
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/29478.htm
NEW QUESTION 27
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 28
Which command is used to get the Docker daemon information?
- A. docker pull
- B. docker info
- C. docker version
- D. docker image
Answer: B
Explanation:
Explanation
https://docs.docker.com/engine/reference/commandline/info/
NEW QUESTION 29
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 30
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