Alibaba Cloud ACA-Developer 問題集

質問 1：
Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)
A. 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
B. A STS request consists of an access address, communication protocol, request method, request parameters and character encoding
C. 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
D. The STS service supports the use of both HTTP and HTTPS protocols
正解：A,B,D

質問 2：
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 visitors real IP address. Which of the following statements about obtaining the visitor's real IP address are correct? (Number of correct answers: 2)
A. In Windows, if IIS is used, after installing the "F5XForwardedFor" extension module, the visitor's real IP address can be seen via IIS logs.
B. A visitor's real IP address can only be obtained by modifying the site or web application.
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. 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.
正解：A,B

質問 3：
Which of the following descriptions of Alibaba Cloud ECS storage are correct? (Number of correct answers:
3)
A. Two types of Cloud Disks can be attached to an ECS: System Disks and Data Disks. System Disks host the ECS instances operating system.
B. Alibaba Cloud provides a wealth of block storage products for ECS, including Cloud Disks (virtualized storage) and Local Disks (physically attached to the server(s) that host your ECS Instances).
C. Both Local Disks and Cloud Disks use a multi-copy distributed storage mechanism, which has low latency, high performance, durability, and high reliability, and supports creation, expansion and release at any time.
D. Cloud Disks come In several different varieties: ESSD (Enhanced Solid State) Cloud Disks. SSD (Solid State ) Cloud Disks, and high-efficiency Cloud Disks.
正解：B,C,D

質問 4：
you have a Node.js based application and you plan to migrate it to Alibaba Cloud Function Compute, which of the following steps is unnecessary?
A. Create a single web application and upload the corresponding code package via the Function Compute console (or fcli)
B. Start and verify the application in the Function Compute console
C. Configure program startup commands and access ports in the Function Compute console
D. Manually install the Node. Js package in the Function Compute console
正解：D

質問 5：
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.
正解：A

質問 6：
A developer is making the ModifyDDInstanceSpec 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
正解：A,B,D

質問 7：
Which of the following statements about PolarDB's endpoint(s) is NOT correct?
A. The endpoint of the PolarDB MySQL database includes the cluster endpoint and the primary endpoint.
B. Through a cluster endpoint, applications can connect to data nodes.
C. The primary endpoint supports read/write splitting.
D. Cluster endpoints support read/write splitting.
正解：D

質問 8：
Which of the following permission control policies does Object Storage Service (OSS) provide for access to objects stored in a bucket? (Number of correct answers: 4)
A. IntranetAccess
B. RAM Policy
C. Bucket Policy
D. Object Policy
E. Dynamic blacklist
F. ACL
G. STS authorization
正解：C,D,F,G

質問 9：
Which of the following is NOT a feature of Alibaba Cloud's Cassandra database service?
A. Supports both narrow and wide tables, providing flexible schema functions
B. Cluster storage, strong expansion of read and write capabilities
C. Enterprise-level capabilities such as disaster tolerance, backup and recovery, security, and monitoring across data centers
D. Centerless distributed architecture
正解：A