A.Confidentiality

B.Non-repudiation

C.Integrity

D.Scalability

A.ICMP unreachable packet attack

B.Teardrop attack

C.Smurf attack

D.TCP fragmentation attack

A.Access user management

B.Internet user management

C.Administrator User Management

D.Device User Management

A.Intrusion detection system includes all hardware and software systems for intrusion detection

B.The intrusion detection system can dynamically collect a large amount of key information and materials through the network and computer, and can timely analyze and judge the current state of the entire system environment.

C.The intrusion detection system can perform blocking operation if it finds that there is a violation of the security policy or the system has traces of being attacked.

D.The flood detection system can be linked with firewalls and switches to become a powerful "helper" of the firewall, which is better and more precise to control traffic access between domains.

A.Malicious programs

B.Natural disasters

C.Hacking

D.DDos attack