A. self protection

B. format the disk

C. Shelling technology

D. Update virus database in real time

A. Passive Protection

B. Self-protection

C. Forced Protection

D. Verification Protection

A. The IP layer can be encrypted

B. No authentication required

C. Can be used without a client

D. There is a NAT traversal problem

A. False

B. True

A. WEB server is down

B. The security policy deployed on the firewall allows the HTTP protocol, but not the ICMP protocol

C. The security policy deployed on the firewall allows the TCP protocol, but not the ICMP protocol

D. The interface of the firewall connecting to the server is not added to the security zone