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

Comment: *

Name: *

Email: *

Verification: *

Anti-DDoS is one of the major features in Alibaba Cloud Security Service. Many websites have experienced different types of DDoS attacks, an accurate understanding of DDoS is crucial to protecting websites. Which of the following descriptions about DDoS attack is the most accurate one?

• A.The main target for DDoS attack is the database.
• B.DDoS attack will try to crack the password through a large number of attempts.
• C.The main purpose of DDoS attack is to make the target server unable to provide service normally, which is one of the network attacks that are most difficult to defend.
• D.The purpose of DDoS attack is to steal confidential information.

Comment: *

Name: *

Email: *

Verification: *

Using a cloud computing service is simple and straightforward. One can choose the instance with desired specification, finish payment and then use it right away. Moreover, the underlying physical machines are managed by cloud service providers and transparent to users.

• A.TRUE
• B.FALSE

Comment: *

Name: *

Email: *

Verification: *

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 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.
• B.By adding a SLB instance and increase the number of ECS instances to reduce the work load on current ECS instances.
• C.Use content delivery network, CDN, to accelerate the caching of the platform's css, JavaScript files etc.
• D.Import data into OSS to share the storage load of the platform.

Comment: *

Name: *

Email: *

Verification: *

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

Comment: *

Name: *

Email: *

Verification: *