Free ACA Developer Exam ACA-Developer Exam Practice Test

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)

• When the user's request enters the system, a globally unique traceld will be generated on the first layer of the calling network.
  
• 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.
  
• Spanld can locate the position of a request in the system call, and who its upstream and downstream dependencies are respectively.
  
• 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.
  

Company A has a large number of files store in Alibaba Cloud OSS that need to be deleted (numbering in the tens of thousands). What is the fastest, easiest way to delete these files?

• Manually delete them one by one
  
• Configure a life cycle rule that matches the entire bucket, and delete all files after one day
  
• Call the API from a script, deleting files in batches
  
• Directly delete the bucket
  

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)

• The security group for ECS-A does not have the default MySQL service port open.
  
• The built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port.
  
• No Internet IP address is configured for ECS-A.
  
• The bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.
  

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)

• Jaeger
  
• Zipkln
  
• Skywalklng
  
• Pinpoint
  

Which of the following options is not included in Object Storage Service (OSS) object URLs?

• Region name
  
• Zone name
  
• Bucket name
  
• Filename
  

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

• Elastic Compute Service (ECS)
  
• Object Storage Service (OSS)
  
• Relational Database Service (RDS)
  
• Server Load Balancer (SLB)
  https://www.alibabacloud.com/help/doc-detail/141499.htm
  

What migration features does Alibaba Cloud SMC (Server Migration Center) support? (Number of correct answers: 3)

• Supports incremental data migration
  
• Supports batch migration
  
• Supports migration from virtual machines to physical machines
  
• Supports migration to Container Registry
  
• Supports all versions Microsoft Windows
  

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

• Custom Events are used for collection of continuous event type data, queries, and alarms.
  
• Custom Events is for periodic and continuous collection of time series monitoring data, queries, and alarms.
  
• Custom Monitoring is used for periodic and continuous collection of time series monitoring data, queries, and alarms.
  
• Custom Monitoring is used for collection of non-continuous event data, such as information about ECS instance restarts.
  

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?

• Manually install the Node. Js package in the Function Compute console
  
• Create a single web application and upload the corresponding code package via the Function Compute console (or fcli)
  
• Configure program startup commands and access ports in the Function Compute console
  
• Start and verify the application in the Function Compute console
  

When a developer calls the Alibaba Cloud SDK to access Elastic Compute Service (ECS), the following error is returned; RealNameAuthenticationError What is the possible cause?

• The ECS instance name violates the ECS service's naming conventions.
  
• The ECS instance name conflicts with other instance names.
  
• The user's Alibaba Cloud account has not passed real name authentication
  
• The API callers account and password are not authorized for ECS access.