Alibaba Alibaba Cloud ACA-CLOUD1 Questions & Answers

• Question 21:

  Cloud disks are reliable because they use __________ to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.

  A. a distributed file management system with 3 redundant copies

  B. a file system

  C. a double copy distributed system

  D. a Linux file system

  Correct Answer: A

  An ECS disk can be used jointly or separately to meet the requirements of different application scenarios. ECS disks are categorized into ephemeral SSD disks and cloud disks. Compared with ephemeral SSD disks, cloud disks are more reliable as they use a triplicate distributed system to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.

  Reference: http://docs-aliyun.cn-hangzhou.oss.aliyun-inc.com/pdf/ecs-product-introduction-intl-en-201703-24.pdf

• Question 22:

  ECS can be used along with ______ to store static images, videos, and reducing storage fees.

  A. OSS

  B. Server Load Balancer

  C. RDS

  D. VPC

  Correct Answer: A

  Reference: http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNA0011858383_enUS_intl_190320132947_public_91775d442a4b315acafcb25df8bcc84f.pdf

• Question 23:

  Alibaba Cloud provides powerful security services (the same level of security services used to support Alibaba Group double 11 shopping festival). However, you have to pay first before using any of the security services.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 24:

  Alibaba Cloud CDN can directly accelerate the access to the files stored in OSS and reduce OSS traffic costs.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 25:

  RDS for MySQL is a PaaS, which means after creating the RDS instance, the user does not need to take care of the underlying OS, runtime environment of software packages. These would be taken care of by Alibaba Cloud.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 26:

  Auto Scaling can automatically remove unhealthy ECS instances from the scaling group (this feature is called Elastic Self-Health). Yet, after removal, the user has to manually add equivalent amount of new ECS instances back to the scaling group.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 27:

  Server Load Balancer can manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application.

  A. TRUE

  B. FALSE

  Correct Answer: A

  Manage sudden spikes in traffic, minimize response time and maintain 99.99% availability of your web application with Server Load Balancer. Reference: https://arcelon.co.id/product/server_load_balancer.php

• Question 28:

  Alibaba Cloud's object storage (Object Storage Service, OSS for short) can be used to store massive amount of files, but there is still a maximum number of files in a single bucket.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 29:

  You can retrieve data directly from an ECS Image and use it right away.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 30:

  Server Load Balancer supports health checks for ECS instances and allows user to specify the frequency. If an ECS instance does not qualify the health check, traffic will not be forwarded to that instance, thereby ensuring application availability.

  A. TRUE

  B. FALSE

  Correct Answer: B