When a network security incident occurs, investigate the intrusion behavior, virus or Trojan horse, and repair and strengthen the host. Which of the above actions belong to the work content of the network security emergency response?

The goal of ( ) is to provide a rapid, composed and effective response in emergency situations. Thereby enhancing the ability of a business to recover immediately from a disruptive event. (fill in the blank)

When the company network administrator configures dual-system hot backup, (fill in the blank) configure the status of VRRP backup group l as Active, and configure the virtual IP address as 10.1.1.1/24
<sysname>system-view
[sysname] interface GigabitEthernet 0/0/1
[sysname-GigabitEthernet0/0/l] ( ), the command to be typed in the blank is (please fill in the complete command in all lowercase)

After a network intrusion event occurs, the identity of the intrusion, the source of the attack and other information are obtained according to the plan, and the intrusion behavior is blocked. The above actions belong to PDRR. What are the links in the network security model? (multiple choice)

In the symmetric encryption algorithm, the _______ algorithm is used in data communication channels, browsers or network links.