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NEW QUESTION 28
A/An _________________ is a copy of data on a disk at a certain point in time.
- A. EIP
- B. snapshot
- C. image
- D. template
Answer: B
NEW QUESTION 29
__________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. least connections scheduling
- B. health check
- C. Weighted Round Robin
- D. session persistence
Answer: D
NEW 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
Answer: B
Explanation:
Explanation
NEW QUESTION 31
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 Linux file system
- C. a file system
- D. a distributed file management system with 3 redundant copies
Answer: D
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 32
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. Configure Auto Scaling appropriately to automatically upgrade/downgrade the ECS instances.
- B. Configure Auto Scaling appropriately to automatically add or reduce ECS instances.
- C. 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.
- D. 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.
Answer: B
Explanation:
Reference:
https://www.alibabacloud.com/product/auto-scaling
NEW QUESTION 33
ECS is a highly flexible service. It can be used independently as a simple web server, or used with other Alibaba Cloud products, such as OSS and CDN, to provide advanced solutions. ECS can be used in applications such as: . (Choose four.)
- A. simple web applications
- B. Databases
- C. no limited online storage
- D. Official corporate websites
- E. large-traffic apps
Answer: A,B,D,E
NEW QUESTION 34
Company A builds a sales management platform based on Alibaba Cloud services, using 3 ECS instances. One of the ECS instance has MySQL installed as the database server of the platform, the other two are used as WEB servers. After some time, due to the rapid increase of employees and sales analysis requests, the performance of the platform is challenged in terms of response time. Through CloudMonitor, it is found that the average CPU usage reaches 70% for the two WEB server ECS instances and the database load reaches
75% for the database server ECS instance. In this situation, company A may choose which Alibaba Cloud services to improve the performance. (Choose two.)
- A. Use content delivery network, CDN, to accelerate the caching of the platform's css, JavaScript files etc.
- B. Import data into OSS to share the storage load of the platform.
- C. By adding a SLB instance and increase the number of ECS instances to reduce the work load on current ECS instances.
- D. Use RDS to replace existing self-built database, in order to obtain better database performance; also creating RDS read-only instances to handle read-only requests, hence reduce the work load on master RDS instance.
Answer: C,D
NEW QUESTION 35
When using Alibaba Cloud OSS, you can set access control in 3 different levels, which are (Choose three.)
- A. Object level
- B. Directory level
- C. Bucket level
- D. RAM account level
Answer: A,B,C
NEW QUESTION 36
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. None of the above is true.
- D. Resources are not shared among the databases in the same RDS instance.
Answer: A
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/26092.htm
NEW QUESTION 37
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. Anti-DDoS Service Basic
- B. Situation Awareness
- C. Managed Security Service
- D. Anti-DDoS Service Pro
Answer: A
NEW QUESTION 38
You canan ECS instance's configuration. (Choose two.)
- A. uploaded
- B. downgraded
- C. downloaded
- D. upgraded
Answer: B,D
NEW QUESTION 39
Multiple lower-configuration I/O-optimized ECS instances can be used with to deliver a high- availability architecture.
- A. Server Load Balancer
- B. RDS
- C. Auto Scaling
- D. OSS
Answer: A
NEW QUESTION 40
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. 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.
- B. 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.
- C. 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.
- D. 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.
Answer: A,B,C
NEW QUESTION 41
Which of the followings are not the operations that you can do on a cloud disk snapshot? (Choose two.)
- A. snapshot rollback
- B. snapshot download
- C. snapshot deletion
- D. snapshot duplicate
Answer: B,D
Explanation:
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/52045.htm#section-1ff-9s6-3i5
NEW QUESTION 42
You can create a custom image for ECS using which of the followings? (Choose two.)
- A. Data disk snapshot
- B. CPU snapshot
- C. System disk snapshot
- D. Memory snapshot
Answer: A,C
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/25460.htm
NEW QUESTION 43
An enterprise hosts their servers (include both Linux and Windows servers) in a traditional IDC. Every night hackers with IP addresses from many countries try to crack the password of their servers, making the administrator terribly worried about this. However, because of work requirements, the remote management port of these servers must be opened to public network.
The administrator heard that Alibaba Cloud has solutions that can help customers improve the security of their systems. Therefore, he/she wants to migrate the system to Alibaba Cloud. Which of the following functions should the administrator activate in Alibaba Cloud to reduce the possibility of brute force password cracking?
- A. Server Guard
- B. Anti-DDoS Basic Service
- C. CloudMonitor
- D. Situation Awareness
Answer: A
Explanation:
Explanation/Reference: https://www.alibabacloud.com/blog/blogblogalibaba-cloud-server-guard-a-comprehensive- assessment_284390
NEW QUESTION 44
Alibaba Cloud does not support Intranet communication between products that are not in the same region, which does not mean ?
- A. ECS instances and other products in different regions, such as ApsaraDB for RDS and OSS instances, cannot communicate with each other on the intranet.
- B. Server Load Balancer cannot be deployed for ECS instances in various regions.
- C. ECS instances in different regions cannot communicate with each other on the intranet.
- D. Server Load Balancer can be deployed for ECS instances in various regions.
Answer: A
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/40654.htm
NEW QUESTION 45
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