2024年3月12日发(作者：)

《计算机网络英语》期末复习试题及答案

一 选择题

1．A ( ) protocol is used to move a datagram over an individual link.

A application-layer

B transport-layer

C network-layer

D link-layer

2．The units of data exchanged by a link-layer protocol are called ( ).

A datagrams

B frames

C segments

D messages

3．Which of the following protocols is not a link-layer protocol? ( )

A Ethernet

B PPP

C HDLC

D IP

4．In the following four descriptions, which one is not correct? ( )

A link-layer protocol has the node-to-node job of moving network-layer datagrams over a

single link in the path.

B The services provided by the link-layer protocols may be different.

C A datagram must be handled by the same link-layer protocols on the different links in the

path.

D The actions taken by a link-layer protocol when sending and receiving frames include

error detection, flow control and random access.

5．Which of the following services can not offered by a link-layer protocol? ( )

A congestion control

B Link Access

C Error control

D Framing

6．( ) protocol serves to coordinate the frame transmissions of the many nodes when

multiple nodes share a single broadcast link.

A ARP

B MAC

C ICMP

D DNS

7．In the following four descriptions about the adapter, which one is not correct? ( )

A The adapter is also called as NIC.

B The adapter is a semi-autonomous unit.

C The main components of an adapter are bus interface and the link interface.

D The adapter can provide all the link-layer services.

8．Consider CRC error checking approach, the four bit generator G is 1011, and suppose that

the data D is 10101010, then the value of R is( ).

A 010

B 100

C 011

D 110

9．In the following four descriptions about random access protocol, which one is not correct?

( )

A In slotted ALOHA, nodes can transmit at random time.

B In pure ALOHA, if a frame experiences a collision, the node will immediately retransmit

it with probability p.

C The maximum efficiency of a slotted ALOHA is higher than a pure ALOHA.

D In CSMA/CD, one node listens to the channel before transmitting.

10．In the following descriptions about MAC address, which one is not correct? ( )

A The MAC address is the address of one node’s adapter.

B No two adapters have the same MAC address.

C The MAC address doesn’t change no matter where the adapter goes.

D MAC address has a hierarchical structure.

11．The ARP protocol can translate ( ) into ( ). ( )

A host name, IP address

B host name, MAC address

C IP address, MAC address

D broadcast address, IP address

12．The value of Preamble field in Ethernet frame structure is ( )

A 10101010 10101010……10101010 11111111

B 10101011 10101011……10101011 10101011

C 10101010 10101010……10101010 10101011

D 10101010 10101010……10101010 10101010

13．There are four steps in DHCP, the DHCP server can complete ( ).

A DHCP server discovery

B DHCP server offers

C DHCP request

D DHCP response

14．In CSMA/CD, the adapter waits some time and then returns to sensing the channel. In the

following four times, which one is impossible? ( )

A 0 bit times

B 512 bit times

C 1024 bit times

D 1028 bit times

15．The most common Ethernet technologies are 10BaseT and 100BaseT. “10” and

“100”indicate( ).

A the maximum length between two adapters

B the minimum length between two adapters

C the transmission rate of the channel

D the transmission rate of the node

16．The principal components of PPP include but not( ).

A framing

B physical-control protocol

C link-layer protocol

D network-layer protocol

17．In the following four options, which service can not be provided by switch? ( )

A filtering

B self-learning

C forwarding

D optimal routing

18．In the following four services, which one was be required in PPP? ( )

A packet framing

B error detection

C error correction

D multiple types of link

19．The ability to determine the interfaces to which a frame should be directed, and then

directing the frame to those interfaces is( ).

A filtering

B forwarding

C self-learning

D optimal routing

20．In ( ) transmission(s), the nodes at both ends of a link may transmit packets at the same

time.

A full-duplex

B half-duplex

C single-duplex

D both full-duplex and half-duplex

21．Consider the data D is , if use even parity checking approach, the parity bit

is( ① ), if use odd parity checking approach, the parity bit is( ② ). ( )

A ①0 ②1

B ①0 ②0

C ①1 ②1

D ①1 ②0

22．In the following four descriptions about parity checks, which one is correct? ( )

A Single-bit parity can detect all errors.

B Single-bit parity can correct one errors.

C Two-dimensional parity not only can detect a single bit error, but also can correct that

error.

D Two-dimensional parity not only can detect any combination of two errors, but also can

correct them.

23．MAC address is ( ) bits long.

A 32

B 48

C 128

D 64

24．Wireless LAN using protocol ( ).

A IEEE 802.3

B IEEE 802.4

C IEEE 802.5

D IEEE 802.11

25．The following protocols are belonging to multiple access protocols except for ( ).

A channel partitioning protocols

B routing protocols

C random access protocols

D taking-turns protocols

26．Which of the following is not belonging to channel partitioning protocols? ( )

A CSMA

B FDM

C CDMA

D TDM

27．In the following four descriptions about CSMA/CD, which one is not correct? ( )

A A node listens to the channel before transmitting.

B If someone else begins talking at the same time, stop talking.

C A transmitting node listens to the channel while it is transmitting.

D With CSMA/CD, the collisions can be avoided completely.

28．( ) provides a mechanism for nodes to translate IP addresses to link-layer address.

A IP

B ARP

C RARP

D DNS

29．A MAC address is a ( )address.

A physical-layer

B application-layer

C link-layer

D network-layer

30．Which of the following is correct? ( )

A No two adapters have the same MAC address.

B MAC broadcast address is FF-FF-FF-FF-FF-FF.

C A portable computer with an Ethernet card always has the same MAC address, no matter

where the computer goes.

D All of the above

31．In the following four descriptions, which one is not correct? ( )

A ARP resolves an IP address to a MAC address.

B DNS resolves hostnames to IP addresses.

C DNS resolves hostnames for hosts anywhere in the Internet.

D ARP resolves IP addresses for nodes anywhere in the Internet.

32．In the LAN, ( )protocol dynamically assign IP addresses to hosts.

A DNS

B ARP

C DHCP

D IP

33．DHCP protocol is a four-step process: ①DHCP request. ②DHCP ACK. ③DHCP server

discovery. ④DHCP server offer(s). The correct sequence is ( )

A ①②③④

B ③②①④

C ③④①②

D ①④③②

34．In the Ethernet frame structure, the CRC field is ( )bytes.

A 2

B 4

C 8

D 32

35．In the Ethernet frame structure, the Data field carries the ( ).

A IP datagram

B segment

C frame

D message

36．In the following four descriptions, which one is not correct? ( )

A Ethernet uses baseband transmission.

B All of the Ethernet technologies provide connection-oriented reliable service to the

network layer.

C The Ethernet 10Base2 technology uses a thin coaxial cable for the bus.

D The Ethernet 10BaseT technology uses a star topology.

37．Ethernet’s multiple access protocol is ( ).

A CDMA

B CSMA/CD

C slotted ALOHA

D token-passing protocol

38．In the following four descriptions about CSMA/CD, which one is not correct? ( )

A An adapter may begin to transmit at any time.

B An adapter never transmits a frame when it senses that some other adapter is

transmitting.

C A transmitting adapter aborts its transmission as soon as it detects that another adapter is

also transmitting.

D An adapter retransmits when it detects a collision.

39．Which of the following descriptions about CSMA/CD is correct? ( )

A No slots are used.

B It uses carrier sensing.

C It uses collision detection.

D All of the above.

40．The Ethernet 10BaseT technology uses( )as its physical media.

A fiber optics

B twisted-pair copper wire

C coaxial cable

D satellite radio channel

41．For 10BaseT, the maximum length of the connection between an adapter and the hub is

( )meters.

A 100

B 200

C 500

D 10

42．A ( )is a physical-layer device that acts on individual bits rather than on frames.

A switch

B hub

C router

D gateway

43．A hub is a ( )device that acts on individual bits rather than on frames.

A physical-layer

B link-layer

C network-layer

D ransport-layer

44．A switch is a( )device that acts on frame.

A physical-layer

B link-layer

C network-layer

D transport-layer

45．In the following four descriptions, which one is not correct? ( )

A Switches can interconnect different LAN technologies.

B Hubs can interconnect different LAN technologies.

C There is no limit to how large a LAN can be when switches are used to interconnect

LAN segments.

D There is restriction on the maximum allowable number of nodes in a collision domain

when hubs are used to interconnect LAN segments.

46．The ability to determine whether a frame should be forwarded to some interface or should

just be dropped is ( ).

A filtering

B forwarding

C self-learning

D optimal routing

47．Which of the following devices is not a plug and play device? ( )

A hub

B router

C switch

D repeater

48．Which of the following devices is not cut-through device? ( )

A hub

B router

C switch

D repeater

49．In the following four descriptions, which one is not correct? ( )

A Switches do not offer any protection against broadcast storms.

B Routers provide firewall protection against layer-2 broadcast storms.

C Both switches and routers are plug and play devices.

D A router is a layer-3 packet switch, a switch is a layer-2 packet switch.

50．Which device has the same collision domain? ( )

A Hub

B Switch

C Router

D Bridge

51．IEEE802.2 protocol belong to ( )layer

A network

B MAC

C LLC

D physical

52．IEEE802.11 protocol defines ( )rules.

A Ethernet Bus

B wireless WAN

C wireless LAN

D Token Bus

53．In data link-layer, which protocol is used to share bandwidth? ( )

A SMTP

B ICMP

C ARP

D CSMA/CD

54．When two or more nodes on the LAN segments transmit at the same time, there will be a

collision and all of the transmitting nodes well enter exponential back-off, that is all of the

LAN segments belong to the same( ).

A collision domain

B switch

C bridge

D hub

55．( )allows different nodes to transmit simultaneously and yet have their respective

receivers correctly receive a sender’s encoded data bits.

A CDMA

B CSMA

C CSMA/CD

D CSMA/CA

56．Because there are both network-layer addresses (for example, Internet IP addresses) and

link-layer addresses (that is, LAN addresses), there is a need to translate between them. For