题目内容

Section B
Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.
(6)

A. It's better than it was.
B. It's not as good as it was.
C. It's as good as it used to be.
D. It was even worse than now.

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关于即时通信系统的描述巾,正确的是

A. 视频聊天数据通常以TCP报文传输
B. 通常具有文件传输功能
C. 消息的发送和接收必须通过服务器中转
D. 不同的即时通信系统都互相兼容

以下不属于身份认证协议的是

A. S/Kev协议
B. 口令认证
C. S/MIME
D. Kerberos

如果主机的IP地址为25.36.8.6,子网掩码为255.255.0.0,那么该主机所属的网络 (包括子网)为

A. 25.36.8.0
B. 25.36.O.O
C. 25.O.0.0
D. O.O.0.O

下表为一路由器的路由表。如果该路由器接收到源IP地址为10.2.56.79,目的IP地址为10.2.1.4的IP数据报,那么它将该数据报投递到

A. 10.2.O.5
B. 10.3.O.7
C. 10.2.56.79
D. 10 .2.1.4

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