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NEW QUESTION 17
Cloud disks are reliable because they use to provide block-level data storage for ECS instances, ensuring 99.9999999% data reliability.
- A. a double copy distributed system
- B. a distributed file management system with 3 redundant copies
- C. a Linux file system
- D. a file system
Answer: B
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
NEW QUESTION 18
___________ 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. least connections scheduling
- C. health check
- D. Weighted Round Robin
Answer: A
Explanation:
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/55202.htm
NEW QUESTION 19
A video streaming company uses SLB to distribute user requests to 30 ECS instances (the 30 ECS instances have the same configuration). Yet, the company finds that the service traffic soars dramatically every night from 20:00 to 02:00. According to their calculation, the evening traffic is 100% higher than the traffic in other periods of time. To properly respond to user requests, which of the following methods is most preferred from the perspective of cost and implementation simplicity?
- A. Manually create 30 ECS instances using the custom image, and then add them to SLB every night before 20:00 and remove them after 02:00.
- B. Create 30 ECS instances based on the custom image and add them to SLB. Then, configure weights for these ECS instances to respond to user requests every night from 20:00 to 02:00, and reset those weights to zero for other periods of time.
- C. Configure Auto Scaling appropriately to automatically add or reduce ECS instances.
- D. Configure Auto Scaling appropriately to automatically upgrade/downgrade the ECS instances.
Answer: C
Explanation:
Reference:
https://www.alibabacloud.com/product/auto-scaling
NEW QUESTION 20
Company B 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. Introduce SLB for extra protection.
- C. Limits access sources by configuring "Anti-leech settings" of OSS bucket attributes.
- D. Changes the website access mode to HTTPS.
Answer: C
Explanation:
Explanation/Reference: http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNOSS11828897_en- US_intl_190202150837_public_b55986256a50380c526a35e863023ec9.pdf (55)
NEW QUESTION 21
You can __________________ an ECS instance's configuration. (Choose two.)
- A. downgraded
- B. uploaded
- C. downloaded
- D. upgraded
Answer: A,D
Explanation:
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/25437.htm
NEW QUESTION 22
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 leverages RAID0+1 configuration of its underlying physical hard disks. There is no impact even if 2 hard disks were to fail simultaneously.
- B. OSS supports 3 internal data copies, so the data can be manually recovered should there be any problem.
- C. OSS supports 3 internal data copies, no human intervention is required to recover the data when anything goes wrong.
- D. Customer has to safeguard their own data. OSS provides various backup interfaces to facilitate offsite backups.
Answer: D
NEW QUESTION 23
Alibaba Cloud OSS is a cloud storage service that features massive capacity, outstanding security, low cost, and high reliability. To control the access to the files stored on OSS, OSS provides multiple access permissions for each bucket. These bucket permissions are . (Choose three.)
- A. Private-read
- B. Public-read
- C. Private
- D. Public-read-write
Answer: B,C,D
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/100676.htm
NEW QUESTION 24
A/An _________________ is a copy of data on a disk at a certain point in time.
- A. image
- B. template
- C. snapshot
- D. EIP
Answer: C
NEW QUESTION 25
ECS can be used along with_____to store static images, videos, and reducing storage fees.
- A. VPC
- B. RDS
- C. OSS
- D. Server Load Balancer
Answer: C
NEW QUESTION 26
Alibaba Cloud provides anti-DDoS products of different levels. If the service availability needs to be kept at 99.9% or higher under DDoS attacks, which of the following is the MOST suitable product?
- A. Situation Awareness
- B. Anti-DDoS Service Basic
- C. Managed Security Service
- D. Anti-DDoS Service Pro
Answer: B
NEW QUESTION 27
Your friend purchases some Alibaba Cloud resources and uses them to build an online training website. Before the site goes online, your friend wants to perform some performance tests but doesn't know how to do it. In this case, which of the following services can help?
- A. Load and Performance Testing Service
- B. Support Ticket Service
- C. None Of The Above
- D. After-Sales Support Service
Answer: D
Explanation:
Reference:
https://www.alibabacloud.com/support/after-sales
NEW QUESTION 28
Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. Which of the following application scenarios are suitable for Auto Scaling?
(Choose three.)
- A. You need to flexibly adjust elastic computing resources based on your business needs, and ECS instances will be added seamlessly to address traffic peaks and surges.
- B. When an ECS instance reacts abnormally in a scaling group, Auto Scaling will create a new ECS instance to take over the computing tasks conducted by the faulty instance.
- C. You want to flexibly adjust elastic computing resources based on your business needs, and ECS instances will be automatically upgraded (with more Memory, more powerful CPU) when needed.
- D. You need to flexibly adjust elastic computing resources based on your business needs, and ECS instances will be reduced automatically to save costs when business needs drop.
Answer: A,B,D
NEW QUESTION 29
ECS can be used along with to store static images, videos, and reducing storage fees.
- A. VPC
- B. RDS
- C. OSS
- D. Server Load Balancer
Answer: C
Explanation:
Reference:
http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNA0011858383_en- US_intl_190320132947_public_91775d442a4b315acafcb25df8bcc84f.pdf
NEW QUESTION 30
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. ECS
- B. CDN
- C. OSS
- D. Container Service
Answer: C
NEW QUESTION 31
Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. It supports adding an existing ECS instance into the scaling group but imposes certain requirements on instance region. In this case, which of the following statements is true?
- A. The instance and the scaling group can be in different regions and zones.
- B. The instance and the scaling group must be in the same region but not necessarily the same zone.
- C. The instance and the scaling group must be in the same region and zone.
- D. Each scaling group can span up to two regions. After adding the ECS instance, the number of regions of all the ECS instances in the scaling group must be no greater than two.
Answer: C
NEW QUESTION 32
Which of the following statements is wrong when comparing RDS with self-built database?
- A. Self-built database supports quick deployment and elastic scaling.
- B. 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.
- C. RDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.
- D. 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.
Answer: A
NEW QUESTION 33
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