网络工程复习题和答案

1．Which one of the following is a broadcast address?（）

A. The MAC address used is 11-11-11-11-11-11

B. The MAC address used is 22-22-22-22-22-22

C. The MAC address used is 00-00-00-00-00-00

D. The MAC address used is FF-FF-FF-FF-FF-FF.

2.Which of the following is a loop back address?( )

A. 10.14.16.12

B. 127.0.0.1

C. 172.15.42.34

D. 209.123.32.212

3. HTTP uses which port number?( )

A. 21

B. 23

C. 80

D. 1024

4. Which of the following is the approximate number of hosts supported in a Class C IP network? ( )

A.254

B. 2024

C. 65 thousand

D.16 million

5. e-Mail and WWW services are available to network users through the ( ) layer.

A. data link

B. network

C. transport

D. application

6. UDP protocol works in the ( ) layer.

A. data link

B. network

C. transport

D. application

7. A periodic signal completes one cycle in 0.001 second .what is the frequency?( )

A. 1Hz

B. 100Hz

C. 1KHz

D. 1MHz

8.Which of the following translate Domain Names into IP addresses?

( )

A. Wins

B. DNS

C. SNMP

D. TCP

9. Which of the following transfer e-mails?

A. telnet

B. DNS

C. FTP

D. SMTP

10. Which of the following is a LAN technology?

A. HDLC

B. PPP

C. FTP

D. Ethernet

11. The network layer works with which of the following( )

A. Segments

B. Bits

C. Frames

D. Packets

12.What is the bandwidth of the FastEthernet networks?( )

A. 1Mbps

B. 10Mbps

C. 100Mbps

D. 1000Mbps

13．The Media Access Control Method of Ethernet is ( ).

A. Aloha

B. Tree walk

C. CSMA/CD

D. CSMA/CA

14. Which protocol works in the Network layer? ( ).

A. IP

B.HTTP

C.FTP

D.UDP

15. Which of the following is the address of Network layer? ( )

A. MAC Address

B.IP Address

C. Port Address

D.Mail Addres

7. Station A is transmitting data to station B, and expects an acknowledgment after every 400 bytes. After transmitting data for a while, the two stations determine the line is reliable and change to expecting and acknowledgement every 600 bytes. This is an example of ( ):

A. Count to infinity

B. Hold down timers

C. Sliding Windows

D. Split Horizon

8. Which factor reduces throughput? ( )

A. increased number of users

B. decreased number of users

C. increased size of hard drive

D. decreased size of hard drive

9. Which is a characteristic of a collision domain? ( )

A. all computers on a single shared access media

B. all computers sharing a single IP address

C. all computers sharing a single MAC address

D. all computers within a WAN

10. Which subnet is the host 200.1.1.67 /26 on? （）

A. 200.1.1.32

B. 200.1.1.128

C. 200.1.1.0

D. 200.1.1.64

一、中文单项选择题（每小题 1 分，总计10 分）

1、可以将模拟数据编码为数字信号的方法有（）

A.FSK

B. PCM

C. QAM

D.曼彻斯特编码

2、如果每个协议数据单元中序号占1个字节，那么序号的范围是（）

A.0～7

B. 0～8

C. 0～255

D. 0～256

3、如果A只会说汉语、B只会说英语，他们通过一个语言翻译器进行会话，这个语言翻译器相当于OSI 7层结构中的（）

A.应用层

B. 表示层

C. 会话层

D. 传输层

4、通信子网不包括（）

A.物理层

B. 数据链路层

C. 网络层

D. 传输层

5、数据链路层采用后退N帧（GBN）协议，发送方已经发送了编号为0～7的帧。当计时器超时，若发送方只收到0、2、3号帧的确认，则发送方需要重发的帧数是（）。

A.2

B. 3

C. 4

D. 5

6、FTP客户和服务器之间传递FTP命令时，使用的连接是（）。

A.建立在TCP之上的控制连接

B. 建立在TCP之上的数据连接