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ACA Developer Certification Question and Answers

ACA Developer Certification

Last Update May 4, 2024
Total Questions : 95

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Questions 1

A developer received a response code of 409 when trying to use a KMS key via the API. Given that a 409 response was returned, which of these states could the KMS key be in? (Number of correct answers: 3)

Options:

A.  

PendingDeletion

B.  

Pendinglmport

C.  

Disabled

D.  

PendingCreate

Discussion 0
Questions 2

A developer runs a web application on a physical machine in an IDC. The machine is running Ubuntu Linux. Which of the following is the recommended method if he wants to migrate this web application onto an Alibaba Cloud ECS instance?

Options:

A.  

Use a third-party image creation tool to create an image from the physical server. Upload the image to the ECS console to turn it into a custom image. Then, use the custom image to create ECS instances.

B.  

Use SMC(Server Migration Center) to collect data from the origin physical server. Create an intermediate ECS instance on Alibaba Cloud and wait for the data transfer to complete. Then generate a new image directly from that intermediate ECS instance.

C.  

Use a third-party image creation tool to create an image from the physical server. The image is then uploaded to Alibaba Cloud Object Storage Service (OSS) for storage. In the ECS console, import that image from OSS, then, create an ECS instance from the custom image.

Discussion 0
Questions 3

A developer recently discovered that their company's application is beginning to suffer performance degradation as a result of increased user demand for the application. After some analysis, the major bottleneck is discovered to be the RDS database instance which hosts the company's databases, "A" and "B". The developer plans to use the DTS data migration solution to move one of the databases to a new RDS instance. Which of the following statements is correct? (Number of correct answers: 3)

Options:

A.  

The code for the application will have to be rewritten once this migration is complete.

B.  

The database account used for data migration must have read and write permissions. To ensure database security, please delete the database account used for data migration or reclaim related write permissions after data migration is completed.

C.  

After disconnecting the connection between the source instance database B and the application, you need to log in to the source database B to check the session messages to ensure that no new sessions performed write operations.

D.  

Create a reverse data migration task and start it to migrate subsequent incremental data from target Instance database B to source instance database B.

Discussion 0
Questions 4

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

Discussion 0
Questions 5

An Elastic Compute Service (ECS) instance (private IP only) needs to read data from a RDS MySQL database in another VPC through a private IP address, and at the same time, RDS's public internet endpoint needs to be available for requests from some internet clients. Which steps must be taken to allow applications to access this RDS instance via both interfaces? (Number of correct answers: 2)

Options:

A.  

Make sure that the security group of the ECS instance allows outbound access to the MySQL service port.

B.  

Add the private and public IP addresses of all applications to the RDS whitelist.

C.  

Connect the two VPCs through CEN.

D.  

Configure a NAT gateway for the VPC to which the ECS instance belongs.

Discussion 0
Questions 6

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

Discussion 0
Questions 7

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?.

Options:

A.  

OSS event trigger(s)

B.  

CloudMonitor trigger(s)

C.  

MNS topic trigger(s)

D.  

SLS trigger(s)

Discussion 0
Questions 8

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.

Discussion 0
Questions 9

Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)

Options:

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

Discussion 0
Questions 10

Which of these are suitable use cases for Alibaba Cloud's ApsaraDB for Redis service? (Number of correct answers: 3)

Options:

A.  

Online gaming user rankings (scoreboard)

B.  

E-Commerce sales & promotions

C.  

Live video chat system

D.  

Enterprise OA system

Discussion 0
Questions 11

A developer creates a MySQL database service on a Linux ECS instance (ECS-A), and wants to access this database service from another instance (ECS-B) in the same VPC using the private IP address bound to the ECS instance, however, the connection can't be established. What could cause this? (Number of correct answers: 2)

Options:

A.  

The security group for ECS-A does not have the default MySQL service port open.

B.  

The built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port.

C.  

No Internet IP address is configured for ECS-A.

D.  

The bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.

Discussion 0
Questions 12

Which of the following cloud services can be integrated with Alibaba Cloud KMS (Key Managed Service)? (Number of correct answers: 3)

Options:

A.  

Elastic Compute Service (ECS)

B.  

Object Storage Service (OSS)

C.  

Relational Database Service (RDS)

D.  

Server Load Balancer (SLB)

Discussion 0
Questions 13

You can use Alibaba Cloud Data transmission service (DTS) or the open source tool Redis-shake to migrate and synchronize data from a local Redis instance to an Alibaba Cloud Redis instance. What is one feature which DTS has but Redis-shake does not?

Options:

A.  

Full data migration

B.  

Incremental data migration

C.  

One-way data synchronization

D.  

Two-way data synchronization

Discussion 0
Questions 14

Which of the following programming languages are supported by the Alibaba Cloud SDK? (Number of correct answers: 3)

Options:

A.  

Java

B.  

Swift

C.  

PHP

D.  

Python

E.  

Bash shell

Discussion 0
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