Which of the following descriptions of the default zone of Huawei firewall is correct?

The attacker scans the ports to discover the ports currently open by the attacked object to determine the attack method. In a port scanning attack, attackers usually use Port Scan attack software to initiate a series of TCP/UDP connections and determine whether the host uses these ports to provide services based on the response messages. Such network detection behavior is called () scanning.

Which of the following levels of protection is generally adopted for extremely important systems in important national fields and departments?

Regarding the difference between pre-accident prevention strategies and post-accident recovery strategies, which of the following statements are correct? (Multiple Choice)

Which of the following are the basic functions of anti-virus software? (Multiple Choice)