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

• A.True
• B.False

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

• A.True
• B.False

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Which of the following statements is NOT correct, when comparing RDS with a self-built database?

• A.RDS provides automatic backup while self-built databases require you to prepare storage space for backup copies and regularly verify that these copies can be restored.
• B.RDS features a high availability of 99 95% while self-built databases require you to implement data protection primary-standby replication, and RAID all by yourself.
• C.Self-built database support quick deployment and elastic scaling.
• D.RDS requires no O&M while self-built database require a dedicated DBA for maintenance, which results in high HR costs.

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Alibaba Cloud Elastic Compute Service (ECS) instances in different Security Groups will definitely have no way to communicate with each other.

• A.True
• B.False

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When forwarding layer 7 service requests using Alibaba Cloud SLB, if you have two domain names under a certain VIP, which are respectively vip.a.com and img.a.com. Now you want to activate session persistence for vip.a.com, but not for img.a.com.
To achieve this, you can select "Rewrite Cookie" mode when enabling session persistence on the console.
In this mode, you can set the cookie name in the response. Server Load Balancer will overwrite the original cookie when it discovers that a new cookie is set. The next time the client carries the new cookie to access the Server Load Balancer, the listener will distribute the request to the previously recorded backend server.

• A.TRUE
• B.FALSE

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