选择题和拖拉题没出新题，实验题是NAT和RIP和FR。其中FR题目有得变动，

第四题认证是有密码的通过sh ru 可以看到Brach offices 的三个路由器都是username ** passwor **username ** passwor **

username ** passwor ** 一类的， 一眼就看出密码来了。

Which of the following correctly describe steps in the

OSI data encapsulation process? (Choose two.)

A. The transport layer divides a data stream into segments and may add reliability and flow controlinformation.

B. The data link layer adds physical source and destination addresses and an FCS to the segment.

C. Packets are created when the network layer encapsulates a frame with source and destination hostaddresses and protocol-related control information.

D. Packets are created when the network layer adds Layer 3 addresses and control information to asegment. E. The presentation layer translates bits into voltages for transmission across the physical link.

这题选 AD是没问题的。