A customer built his website on Alibaba Cloud- To defend against Web attacks he activated Alibaba Cloud WAF However, a week later, the customer finds that his website has suffered intrusion. Which of the following actions should he take to ensure that WAF functions correctly and enhance system security?
(Number of correct answers: 4)

• A.Delete all snapshots and clear the server
• B.Configure a security group for the ECS instance.
• C.Use Security Center to remove Trojans and fix vulnerabilities
• D.Secure other HTTP services on the ECS instance using WAF
• E.Resolve the website domain name to the site s source IP address
• F.Check whether or not the DNS resolution results point to the WAF address

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Alibaba Cloud's CloudMonitor can not only monitor ECS instances in a secure and efficient way, but also monitor HTTP sites of clients' servers in data centers However, in the latter case, Alibaba Cloud does not provide monitor agent so users need to develop their own scripts to collect data

• A.False
• B.True

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Border Gateway Protocol (BGP) is mainly used for interconnection between autonomous systems (AS) on the Internet It. Controlling route transmission and selecting the best route Alibaba Cloud uses a BGP multi-line access mechanism for all its IDCs in China. Which of the followings are advantages of a BGP multi-line IDC?
(Number of correct answers 2)

• A.High-speed interconnection
• B.Larger bandwidth
• C.Elimination of access barriers between North China and South China because China is big and North China and South China has different telecom operators
• D.Low bandwidth cost

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Cloud computing service security requires the joint effort of the cloud service supplier (such as Alibaba Cloud), independent software vendor (ISV), and users The failure of any party to fulfill their responsibilities may lead to security risks. Which of the following are the responsibilities of the cloud computing service users? (Number of correct answers 2)

• A.Regularly change the service system password
• B.Provide security protection for physical infrastructure
• C.Ensure multi-channel power supply in the Cloud data center
• D.Strengthen information security management in the company to prevent sensitive information leakage

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Alibaba Cloud ECS instances are common targets of hacker attacks. There are many types of attacks against ECS instances. Which of the following attacks specifically target the operating system of an ECS instance?
(Number of correct answers: 3)

• A.Trojan or Webshell installation
• B.Brute force RDP password cracking
• C.SQL injection
• D.Brute force SSH password cracking

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