All versions of Alibaba Cloud RDS use master-slave mode to ensure high availability. When the master database fails, RDS will switch to the standby database within 30 seconds.

• A.True
• B.False

Comment: *

Name: *

Email: *

Verification: *

Many of Alibaba Cloud services provide highly reliable data storage capacity. For example, Object Storage Service (OSS) promises that its data reliability is no less than 99 99999999%. This high data reliability is solely achieved by RAID 0+1 redundancy technology.

• A.True
• B.False

Comment: *

Name: *

Email: *

Verification: *

A company launched its online service just a year ago. It uses five ECS instances and does not have a full-time system administrator Over the last six months, the company's system has encountered various security problems Several high-risk vulnerabilities were exploited by hackers, leading to leakage of the company's confidential data. Which of the following Alibaba Cloud products can be used to quickly resolve this problem?

• A.Managed Security Service
• B.Cloud Firewall
• C.Anti-DDoS Pro Service
• D.Security Center

Comment: *

Name: *

Email: *

Verification: *

An online education website is built based on ECS. SLB and Auto Scaling, which greatly reduces resource cost, O&M cost and without compromising system stability and user experience.
Now. the website admin wants to keep the user information (such as source IP, accessed URLs, and duration on each page) for analysis to support their upcoming campaign events In this case, which of the following statements is NOT correct?

• A.Save user-related access information to ApsaraDB for RDS in real time or quasi real time, which can then be used for performing query and analysis.
• B.Synchronize user-related access information to OSS in real time or quasi real time for further use
• C.Let each ECS instance in the scaling group keeps the user access information it processes Thus, the data saved by these ECS instances can be accessed and analyzed at any time, making the solution not only simple, but also efficient reliable, and cost-effective.
• D.Synchronize user-Synchronize user-related access information to ApsaraDB for Memcache in real time or quasi real time. Then, access Memcache using an application or make the data in Memcache persistent based on certain rules and then can use the persistent data for further analysis.

Comment: *

Name: *

Email: *

Verification: *

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 must be in the same region and zone.
• B.The instance and the scaling group must be in the same region but not necessarily the same zone.
• C.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.
• D.The instance and the scaling group can be in different regions and zones.

Comment: *

Name: *

Email: *

Verification: *