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)

To improve ECS instance security, the administrator does not want users on public network to check whether an ECS instance is online using the ping command. Which of the following reinforcement measures designed by the administrator is NOT feasible?

Alibaba Cloud Security's Data R.sk Control can effectively resolve junk registration, database hacking, and other service risk identification problems To use this service. you need to first collect service data. Which of the following methods can be used to collect information off Web application systems?

Clean bandwidth refers to the maximum normal clean bandwidth that can be processed by Anti-DDoS Premium instances when your business is not under attack. Make sure that the Clean bandwidth of the instance is greater than the peak value of the inbound or outbound traffic of all services connected to the Anti-DDoS Premium instances If the actual traffic volume exceeds the maximum Clean bandwidth, your business may be subject to traffic restrictions or random packet losses, and your normal business may be unavailable, slowed, or delayed for a certain period of time

Alibaba Cloud WAF currently supports web security protection for HTTP and HTTPS. Which of the following ports are usually used for HTTP and HTTPS protocols? (Number of correct answers: 2)