下列关于Firewall的说法最准确的是（）.

A:Security Gateway B:System C:NET D:计算机

下列关于firewall的叙述，何者正确？（）

A:网络防火墙 B:一套用来明显区隔两个（或以上）网络之间的一组软硬件装置 C:最大的目的在于防止网络遭受入侵 D:以上皆是

Firewall is a（）mechanism used by organizations to protect their LANs from the Internet.

A:reliable B:stable C:peaceful D:security

The typical firewall consists of two packet filters and a (an)

A:router B:bridge C:application D:server

The typical firewall consists of two packet filters and a (an)（）

A:router B:bridge C:application D:server

The typical firewall consists of two packet filters and a (an)（）

A:router B:bridge C:application D:server

The typical firewall consists of two packet filters and a (an)

A:router B:bridge C:application D:server