In Alibaba Cloud, a developer finds that the ECS instance he created does not have public IP assigned. The API method used was "CreateInstance". Which of the following is the most likely reason?

• A.The developer did not call AllocatePublicIpAdress (an additional API call), which is needed to assign a public IP
• B.The CreateSecurityGroup API call was not made
• C.The CreateDisk API call was not made
• D.The ECS was not restarted after being created

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PolarDB supports three engines: MySQL, PostgreSQL and Oracle.

• A.True
• B.False

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Which of the following statements about ECS Snapshot is NOT correct?

• A.You can manually create snapshots
• B.You can create automatic snapshots
• C.You can roll back a disk by using a snapshot
• D.You can create an ECS instance from a snapshot

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Which of these metrics are collected by CloudMonitor's Host Monitoring function? (Number of correct answers: 3)

• A.CPU status of the ECS instance
• B.Running processes on the ECS instance
• C.Storage space used by OSS buckets
• D.ECS network I/O

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Which of the following services is used to establish private network connections between virtual private clouds (VPCs) in different regions, or between VPCs and data centers?

• A.CEN (Cloud Enterprise Network)
• B.Express Connect
• C.VPN Gateway
• D.NAT Gateway

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