A.正确

B.错误

正确答案：正确

第四章单元测试

1、RARP protocol translates IP addresses into MAC addresses.。

A.正确

B.错误

正确答案：错误

2、The PING command is implemented by the ICMP echo request/reply.。

A.正确

B.错误

正确答案：正确

3、An IP address consists of a network number field and a host number fielD.。

A.正确

B.错误

正确答案：正确

4、The main task of the Internet’s Domain Name System（DNS） is to：

A.Translate mnemonic（记忆的）names to IP addresses

B.Translate port numbers to IP addresses

C.Specify the standards for Internet domain names

D.Provide an authority for registering domain names

正确答案：Translate mnemonic（记忆的）names to IP addresses

5、The Internet’s network layer is responsible for moving network-layer packets known as（） from one host to another.

A.frame

B.datagram

C.message

D.segment

正确答案：datagram

第五章单元测试

1、MAC address is unique in the worlD.。

A.正确

B.错误

正确答案：正确

2、A 16-port switch，each port is 10/100M full-duplex adaptive，then bus bandwidth of the switch is（）

A.3.2G

B.10M

C.100M

D.1.6G

正确答案：100M

3、The switch receives a frame whose targe address cannot be found in its MAC address table，then switch will do（）

A.send back

B.flooding

C.discard

D.forward

正确答案：flooding

4、What is true of the ARP table in the following description is？

A.mapping of IP address to MAC address

B.error detection

C.reduce network traffic

D.routing selection

正确答案：mapping of IP address to MAC address

5、Which layer does the switch work on？

A.transport layer

B.link layer

C.application layer

D.network layer

正确答案：link layer

第六章单元测试

1、There are two address fields in 802.11 frame.。

A.正确

B.错误

正确答案：错误

2、What are the type of wireless networks？

A.Single hop， infrastructure-less

B.Single hop， infrastructure-based

C.Multi-hop， infrastructure-based

D.Multi-hop， infrastructure-less

正确答案：Single hop， infrastructure-less；Single hop， infrastructure-based；Multi-hop， infrastructure-based；Multi-hop， infrastructure-less

3、Hosts in wireless networks can work in two modes（）

A.infrastructure mode

B.online mode

C.ad hoc mode