Alibaba Alibaba Certifications ACA-CLOUD1 Questions & Answers

• Question 51:

  Which of the following statements is wrong when comparing RDS with self-built database?

  A. RDS features a high availability of 99.95% while self-built database requires you to implement data protection, primary-standby replication, and RAID all by yourself.

  B. RDS provides automatic backup while self-built database requires you to prepare storage space for backup copies and regularly verify that these copies can be restored.

  C. Self-built database supports quick deployment and elastic scaling.

  D. RDS requires no OandM while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.

  Correct Answer: C

• Question 52:

  A company wants to use Alibaba Cloud service to replace their self-built database, which of the following services should it choose?

  A. AsparaDB for RDS

  B. Server Load Balancer (SLB)

  C. Alibaba Cloud CDN (Content Delivery Network)

  D. Deploy more ECS instances

  Correct Answer: D

• Question 53:

  Which of the following is not the database type supported by RDS?

  A. MySQL

  B. SQL Server

  C. Postgre SQL

  D. Oracle database

  Correct Answer: D

  Reference: https://aws.amazon.com/rds/features/

• Question 54:

  SQL injection is a common application layer attack, usually through building special input parameters and pass it to web applications to steal or sabotage the application data. Which of the following is the target for SQL injection?

  A. Web application

  B. Database

  C. Confidential files on the server

  D. Pictures on server

  Correct Answer: B

  Reference: https://www.rapid7.com/fundamentals/sql-injection-attacks/

• Question 55:

  Which of the following scenarios is applicable to use RDS read-only instances?

  A. Reduces the write pressure on the RDS primary instance.

  B. Reduces the read pressure on the RDS primary instance.

  C. Implements data backtracking for the last two days.

  D. Improves RDS storage capabilities.

  Correct Answer: B

• Question 56:

  Which of the following statements about file uploading to OSS strategy is not correct?

  A. All file uploading method provided by Alibaba Cloud OSS service will support resuming from break point.

  B. If you are uploading some small files (<1m), you can choose using put method to be able finish uploading in one http request.

  C. If you are using OSS to store some log files which are continuously being updated, you better choose streaming method to be able to append to one existing object instead of overwriting.

  D. If you need to upload very large file you better use multi-part uploading to get the capability of resuming from break point.

  Correct Answer: C

• Question 57:

  Which method is not supported by OSS to create a bucket?

  A. through OSS API/SDK

  B. through ECS instance filesystem directory operation

  C. through oss cmd tool

  D. through cloud console

  Correct Answer: C

• Question 58:

  A large shopping mall deploys a new video surveillance system. The five-floor building in which the mall is located installed 35 HD cameras to monitor the major exits. The surveillance system is deployed on an ECS instance, which has four 2 TB data disks to store video data.

  However, video data grows rapidly and the engineers find that the ECS will run out of storage space within 2 weeks.

  In this case, _____________ product is thought to be the best solution for addressing the storage challenge while ensuring quick access to historical video data when needed.

  A. Container Service

  B. ECS

  C. OSS

  D. CDN

  Correct Answer: C

• Question 59:

  www.company.com is a newly launched social portal for exchanging automotive information. The portal is based on PHP, including 10GB of images, and some JavaScripts files. Currently one single ECS instance is used to host all the application content as well as a MySQL database. With the growing number of users, the portal is getting slower to load images or respond to user requests. Moreover, there will be additional 50GB image content uploaded to the portal every week. Which combination of Alibaba Cloud services below can help resolve the storage and performance issue at the same time?

  A. OSS + CDN combination

  B. OSS + MTS combination

  C. OSS + RDS combination

  D. OSS + ECS combination

  Correct Answer: D

• Question 60:

  Which of the following statements to OSS bucket is not correct?

  A. Every user can create more than one bucket

  B. Bucket name can be changed after creation

  C. Every bucket should have a unique name

  D. There is no limitation to objects number inside one bucket

  Correct Answer: B

  Reference: https://www.alibabacloud.com/help/doc-detail/31885.htm? spm=a2c63.p38356.a3.3.43f03bb9a3KjLl