ACA Cloud Computing Certification Exam v1.0 (ACA-Cloud1)

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Total 77 questions

Alibaba Cloudג€™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


Answer : A

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

  • A. TRUE
  • B. FALSE


Answer : A

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


Answer : B

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


Answer : A

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


Answer : B

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


Answer : A

Reference:
http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNA0011858383_en-
US_intl_190320132947_public_91775d442a4b315acafcb25df8bcc84f.pdf

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


Answer : A

Explanation:
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-2017-03-24.pdf

Which of the following ECS instance configurations can't be changed if we don't change instance type?

  • A. Mem size
  • B. System disk size
  • C. Data disk size
  • D. Number of data disk


Answer : B

Some applications may encounter large traffic fluctuations within a short period. When ECS is used with _______, the number of ECS instances is automatically adjusted based on traffic.

  • A. Server Load Balancer
  • B. RDS
  • C. Auto Scaling
  • D. OSS


Answer : C

Reference:
https://www.alibabacloud.com/help/doc-detail/25371.htm

A company uses Alibaba Cloud SLB and Auto Scaling at the same time, hoping this combination can help save O&M cost and provide a stable and reliable system.
However, because they do not have relevant experience, the company's engineers listed some precautions based on their understanding, and turned the list to you for advice.
As an expert of Alibaba Cloud, you tell them only _______________ is correct.

  • A. SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
  • B. All ECS instances under the same SLB instance must be running on the same operating system
  • C. All backend servers under the same SLB instance must be in the same Scaling Group
  • D. All backend servers under the same SLB instance must have the same configuration


Answer : A

Reference:
https://www.alibabacloud.com/blog/comprehensive-upgrade-of-alibaba-cloud-auto-scaling-product_594112

___________ feature in Server Load Balancer means that it can forward the access requests from a single user to the same ECS instance within a certain period to ensure session continuity.

  • A. session persistence
  • B. health check
  • C. Weighted Round Robin
  • D. least connections scheduling


Answer : A

Reference:
https://www.alibabacloud.com/help/doc-detail/55202.htm

Alibaba Cloud Object Storage Service (OSS) is a massive, highly available, secured and cost effective storage service. One of the special characteristics of OSS is its superior data reliability, because of its underlying backup technology and policies. Which of the following statement about OSS backup is correct?

  • A. OSS supports 3 internal data copies, so the data can be manually recovered should there be any problem.
  • B. Customer has to safeguard their own data. OSS provides various backup interfaces to facilitate offsite backups.
  • C. OSS leverages RAID0+1 configuration of its underlying physical hard disks. There is no impact even if 2 hard disks were to fail simultaneously.
  • D. OSS supports 3 internal data copies, no human intervention is required to recover the data when anything goes wrong.


Answer : B

Alibaba Cloud Object Storage Service (OSS) is a massive, highly available, secured and cost effective storage service. OSS is superior than self-built storage in all these aspects. Which of the following advantage relates to the high availability of OSS?

  • A. Availability actually relies on the underlying hardware, which can break down easily. Once the hard disk malfunctions, it can also lead to permanent data loss.
  • B. Data Reliability is not less than 99.99999999%. Data is backed up automatically with multiple redundant copies.
  • C. Data has to be backed up by customer manually, which is time-consuming and labor-intensive.
  • D. The following features are available: Multiple Authentication and Authorization mechanism, Whitelist, Anti-leech URL, and Master-Sub Account


Answer : B

Reference:
https://www.alibabacloud.com/blog/alibaba-cloud-object-storage-vs--ibm-cloud-and-oracle-cloud-equivalent_293464

Company ׀’ builds a music download website based on OSS and ECS, and users can download mp3 files after registering for the website. Recently, the public network traffic to the OSS has doubled but the increase of registered users is less than 10%. After in-depth analysis, engineers find that many user download requests are raised from search engine but not the website itself. In this case, which of the following measures is thought to be able to address this issue.

  • A. Migrates music files from the OSS to the data disks for ECS instances.
  • B. Changes the website access mode to HTTPS.
  • C. Limits access sources by configuring ג€Anti-leech settingsג€ of OSS bucket attributes.
  • D. Introduce SLB for extra protection.


Answer : C

Reference:
http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNOSS11828897_en-
US_intl_190202150837_public_b55986256a50380c526a35e863023ec9.pdf
(55)

Which of the following statements is true for RDS?

  • A. Multiple databases can be created in one RDS instance.
  • B. Databases with the same name are allowed in the same instance.
  • C. Resources are not shared among the databases in the same RDS instance.
  • D. None of the above is true.


Answer : A

Reference:
https://www.alibabacloud.com/help/doc-detail/26092.htm

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Total 77 questions