未分类题

根据下面的文字资料回答 6～7 题 SSL协议是运行在（ 1 ）层的协议，而IPSec协议是运行在（ 2 ）层的协议。
第6题：文中（ 1 ）处正确的答案是（）。

A.数据链路
B．网络
C．传输
D．应用

【参考答案】

C

此题考查安全协议的工作层，SSL运行于传输层；IPSec则运行于网络层。

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单项选择题

SSL协议是运行在（1）层的协议，而IPSec协议是运行在（2）层的协议。文中（1）处正确的答案是（）。

A．数据链路
B．网络
C．传输
D．应用

未分类题

根据下面的文字资料回答 71～75 题 connected by（ 1 ）or Hubs,which just move the bits from one network to an identical network. One layer up we find bridgas and swiehes,which operate at data link layer. They can accept （ 2 ） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer,we have touters that can connect two netwoks. If two networks have（ 3 ）network layer,the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which cart interface between the two transport connections. Finally, in the application layer, application gateways translate message（ 4 ）. As an example,gateways between Internet e-mail and X.400 e-mail must （ 5 ）the e-mail message and change various header fields. 第6题：文中（ 1 ）处正确的答案是（）。A．reapersB．relaysC．connectsD．modems

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