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ACA-Developer Sample Questions Answers

Questions 4

In order to have your applications interact with Alibaba Cloud RabbitMQ, you need to create related MQ resources first. Which of the following resources must be created? (Number of correct answers: 3)

Options:

A.

Vhost

B.

Exchange

C.

Queue

D.

Broker

E.

Topic

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Questions 5

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)

Options:

A.

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

B.

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

C.

HTTP Header settings may cause cache misses.

D.

The origin site has a large number of dynamic resources.

E.

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

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Questions 6

Which of the following statements describe the trace/D and spanID in a service tracking system (such as Zipkin) correctly? (Number of correct answers: 3)

Options:

A.

When the user's request enters the system, a globally unique traceld will be generated on the first layer of the calling network.

B.

The tracelD will be called with each layer and passed back continuously, so through traceld, the path of a user request in the system can be connected in series.

C.

Spanld can locate the position of a request in the system call, and who its upstream and downstream dependencies are respectively.

D.

Traceld is used to distinguish the sequence of calls between different services of the system, spanld is used to concatenate all the paths that a certain request traverses in the system.

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Questions 7

A game company is developing a game application for the Apple and Android platforms. Currently, this application stores user data (as flat files) securely on the local storage of a user's device. The game company wants to provide a new feature that allows customers to play the same game on different devices, which requires synchronizing user data between different devices. Which of the following cloud services supports this requirement without creating a new back-end application?

Options:

A.

Function Compute

B.

Object Storage Service (OSS)

C.

Table Store

D.

Log service

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Questions 8

Which of the following options correctly describes CloudMonitor Custom Monitoring and Custom Events? (Number of correct answers; 2)

Options:

A.

Custom Events are used for collection of continuous event type data, queries, and alarms.

B.

Custom Events is for periodic and continuous collection of time series monitoring data, queries, and alarms.

C.

Custom Monitoring is used for periodic and continuous collection of time series monitoring data, queries, and alarms.

D.

Custom Monitoring is used for collection of non-continuous event data, such as information about ECS instance restarts.

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Questions 9

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

Options:

A.

HTTP(s) service

B.

CloudMonitor Service

C.

Resources In a VPC

D.

Function Compute

E.

Log service

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Questions 10

Assume that a company uses ApsaraDB for PolarDB. The company commonly queries users based on their basic information, including: addresses, company names, and ID numbers. In this scenario, what is the best practice for creating a database index (or indexes)?

Options:

A.

Create a b-tree index on each column to be searched.

B.

Create a hash index on each column to be searched.

C.

Create a gin index for multiple fields.

D.

Create a gist index for multiple fields.

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Questions 11

A development team currently supports an application that is designed to be deployed on a single server's local memory As part of migrating to Alibaba Cloud, the team needs to use Auto Scaling, and must therefore move their game state data off of their servers, so that they can automatically scale up and down without losing game data. Where should the team store these game results to best allow for consistent results without impacting performance?

Options:

A.

OSS

B.

RDS

C.

Redis

D.

Log Service

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Questions 12

A developer is writing logs through the Log Service API, and can see via the Logstore monitorin metrics that write traffic is about 10 MB/s, but a 403 error is reported during the writing process. Which of these is a possible cause?

Options:

A.

There is significant network delay

B.

The write throughput of a single partition is limited, and the 10 MB/s write traffic exceeds

C.

There is not enough space in the Logstore partition

D.

The target partition in the Logstore is not specified

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Questions 13

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)

Options:

A.

Event Notifications can cross regions.

B.

Message Service provides synchronous notifications 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 retried based on the specified retry policy.

D.

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

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Questions 14

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

Options:

A.

Import the migration source information to the SMC console.

B.

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

C.

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

D.

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

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Exam Code: ACA-Developer
Exam Name: ACA Developer Certification
Last Update: Mar 25, 2024
Questions: 95
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