最新的Alibaba Developer認證 ACA-Developer考試題庫

問題1

Function Compute supports one-way triggers and two-way triggers. Which of the following triggers is a one-way trigger? That is to say you only need to configure the trigger in the event source, not in Function Compute?.

A. OSS event trigger(s)

B. MNS topic trigger(s)

C. SLS trigger(s)

D. CloudMonitor trigger(s)

正確答案: D

問題2

Which of the following statements are correct, with regard to Alibaba Cloud Log Service? (Number of correct answers: 3)

A. The Log Service frontend service adopts an LVS + NGINX architecture

B. The Logstore backend service is deployed on a single machine to complete the real-time persistence, indexing, query and delivery of Logstore data to MaxCompute

C. As an agent for collecting logs, Logtail can collect logs from existing system log files in a non-intrusive manner

D. Each log written to the Log Service backend will be saved in triplicate (across three separate physical servers)

正確答案: A,B,D

問題3

In Alibaba Cloud RocketMQ, messages are kept for up to _____ days. We recommend configuring a monitoring service to watch the consumption status, and intervene manually when ''not consumed but to be deleted'' message alarms occur.

A. 4

B. 5

C. 3

D. 2

正確答案: C

問題4

If a user finds that the Content Delivery Network (CDN) cache hit rate is low, what could be the reason?
(Number of correct answers: 3)

A. Cache configuration is inappropriate (ex. overly short Cache Expiry Time for popular files).

B. The origin site has a large number of dynamic resources.

C. When the website has low traffic, the CDN will receive fewer requests and this will result in a lower cache hit rate.

D. HTTP Header settings may cause cache misses.

E. Insufficient bandwidth was selected when enabling the CDN service, causing the service capacity reach its limit too early.

正確答案: A,C,E

問題5

Alibaba Cloud Link Tracing Analysis supports call link reporting based on the Open Tracing standard. Which of the following client types does link tracing support? (Number of correct answers:3)

A. Zipkln

B. Skywalklng

C. Jaeger

D. Pinpoint

正確答案: C

說明：（僅 VCESoft 成員可見）

問題6

During the process of backing up an RDS database, a developer found that the backup failed. What might cause this to happen?

A. DCL operations were performed during the backup

B. DML operations were performed during the backup

C. The database instance is not stopped

D. DDL operations were performed during the backup

正確答案: B

問題7

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. 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.

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. 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.

D. A visitor's real IP address can only be obtained by modifying the site or web application.

正確答案: B,D

問題8

Which of the following database connection methods does ApsaraDB for Redis support? (Number of correct answers: 2)

A. Redis-cIl

B. aliyun-cll

C. DMS (Data Management Service)

D. Sentinel

正確答案: A,D

問題9

Which of the following is NOT required for SMC (Server Migration Center) to migrate a server to Alibaba Cloud?

A. From the SMC console, configure the type of disk image to be generated during the migration.

B. The SMC client transfers the source data to an intermediate ECS instance.

C. Import the migration source information to the SMC console.

D. The SMC backend service generates a target Alibaba Cloud image based on the migration source.

正確答案: C

問題10

Which of the following are types of backend services that API Gateway supports? (Number of correct answers: 3)

A. Resources In a VPC

B. HTTP(s) service

C. Function Compute

D. Log service

E. CloudMonitor Service

正確答案: A,B,E

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