计算机网络英文复习题

计算机网络英文复习题-CAL-FENGHAI.-(YICAI)-Company One1

、英译汉（10分）

1.TCP(Transmission Control Protocol) 传输控制协议

2.IP(Internet Protocol) 互联网协议

3.RFC(Requests for comments) 请求评议

4.SMTP(Simple Mail Transfer Protocol) 简单邮件传输协议

5.Congestion-control 拥塞控制

6.Flow control 流控制

7.UDP (User Datagram Protocol) 用户数据报协议

8.FTP(File Transfer Protocol) 文件传输协议

9.HTTP( Hyper-Text Transfer Protocol ) 超文本传输协议

10.TDM 时分复用

11.FDM 频分复用

12.ISP(Internet Service Provider) 互联网服务提供商

13.DSL(Digital Subscriber Line) 数字用户线路

14.DNS(Domain Name System) 域名系统

15.ARQ(Automatic Repeat Request) 自动重发请求

16.ICMP(Internet Control Message Protocol) 网间控制报文协议

17.AS(Autonomous Systems) 自制系统

18.RIP(Routing Information Protocol)\ 路由信息协议

19.OSPF(Open Shortest Path First) 开放最短路径优先

20.BGP (Border Gateway Protocol) 边界网关协议

21.HFC 光纤同轴电缆混合网

22.CRC(Cyclic Redundancy Check) 循环冗余检验

23.CSMA/CD 带冲突检测的载波侦听多路存取

24.ARP 地址解析协议

25.RARP 反向地址解析协议

26.DHCP 动态主机配置协议

27.RTT 循环时间

28.IETF(P5) 互联网工程任务组

29.URL(P88) 统一资源定位

30.API 应用程序编程接口

31.MIME 多用途互联网邮件扩展

32.MTU(P328) 最大传输单元

二、单项选择题（每小题l分，共30分）

1. DSL divides the communication link between the home and the ISP into three nonoverlapping frequency bands, a upstream channel is in _A_________.

A)50 kHz to 1MHz band B) 1MHz to 2MHz band

C)4 kHz to 50kHz band D) 0 to 4kHz band

2. As a data packet moves from the upper to the lower layers, headers are A .

A) Added; B) subtracted; C) rearranged; D) modified

3. What is the main function of the network layer D

A) node-to-node delivery; B) process-to-process message delivery

C) synchronization; D) updating and maintenance of routing tables

4. Which of the following is the default mask for the address 168.0.46.201

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B

A) 255.0.0.0; B) 255.255.0.0; C) 255.255.255.0; D) 255.255.255.255

5. A router reads the address on a packet to determine the next hop. A

A) IP ; B) MAC; C) source; D)ARP

6 . Which device can’t isolates the departmental collision domains. A

A) Hub; B) switch; C) router; D) A and B

7. Input port of a router don’t perform ____D____ functions.

A) the physical layer functions B) the data link layer functions

C) lookup and forwarding function D) network management

8. HTTP has a mechanism that allows a cache to verify that its objects are up to date. The mechanism is D

A) persistent connections B) cookies C) Web Caching D) conditional GET

9. A protocol layer can be implemented in ___D_____.

A) software B) hardware C) a combination of the software and hardware D) All of the above

10. A protocol has three important factors, they are_A______.

A)syntax, semantics, order B) syntax, semantics, layer

C)syntax, semantics, packet D) syntax , layer, packet

11. There are two broad classes of packet-switched networks: datagram networks and virtual-circuit networks. The virtual-circuit networks forward packets in their switches use ___D___.

A) MAC addresses B) IP addresses

C) e-mail addresses D) virtual-circuit numbers

12. TCP service model doesn’t provide ___D_______service.

A) reliable transport service B) flow control service

C) congestion-control service D) guarantee a minimum transmission rate service.

13. Usually elastic applications don’t include____B______.

A) Electronic mail B) Internet telephony

C) file transfer D) Web transfer

14. A user who uses a user agent on his local PC receives his mail sited in a mail server by using _B___ protocol.

A)SMTP B) POP3

C)SNMP D) FTP

15. Considering sliding-window protocol, if the size of the transmitted window is N and the size of the receiving window is 1,the protocol is B

A) stop-and-wait protocol B) Go-Back-N protocol

C) selective Repeat protocol D) alternating-bit protocol

16. which IP address is effective___B______.

A) 202,131,45,61 B) 126.0.0.1

C) 192.268.0.2 D) 290.25.135.12

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17. if IP address is 202.130.191.33, subnet mask is 255.255.255.0,then subnet prefix is__D_____

A) 202.130.0.0 B) 202.0.0.0

C) 202.130.191.33 D)202.130.191.0

18.The command Ping s implemented with __B______messages

A) DNS B) ICMP

C) IGMP D) RIP

19. Which layer-function is mostly implemented in an adapter __A________

A) physical layer and link layer B) network layer and transport layer

C)physical layer and network layer D) transport layer and application layer

20. If a user brings his computer from Chengdu to Peking, and accesses Internet again. Now, __B_____ of his computer needs to be changed.

A) MAC address B) IP address

C) e-mail address D) user address

1. .traceroute is implemented with __B____messages.

A) DNS B) ICMP

C) ARP D) RIP

2. A router reads the A address on a packet to determine the next hop.

A. IP ;

B. MAC;

C. source;

D.ARP

3. There are two broad classes of packet-switched networks: datagram networks

and virtual-circuit networks. The virtual-circuit networks forward packets in

their switches use ___D___.

A) MAC addresses B) IP addresses

C) e-mail addresses D) virtual-circuit numbers

4. About subnet, which underlying description isn’t right______

A) device interfaces with same subnet part of IP address

B) can’t physically reach each other without intervening a router.

C) all of the devices on a given subnet having the same subnet address.

D) A portion of an interface’s IP address must be determined by the subnet to which it is connected.

5. if IP address is 102.100.100.32, subnet mask is 255.255.240.0,then subnet prefix is___A___

A) 102.100.96.0 B) 102.100.0.0

C) 102.100.48.0 D) 102.100.112.0

6 If a user brings his computer from chengdu to beijing, and accesses Internet

again. Now, ___B__ of his computer needs to be changed.

A) MAC address B) IP address

C) e-mail address D) user address

7.Input port of a ro uter don’t perform ____D___ functions.

A) the physical layer functions B) the data link layer functions

C) lookup and forwarding function D) network management

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8.switching fabric is at the heart of a router, switching can be accomplished in a

number of ways, donit include_ D _

A)Switching via memory B)Switching via crossbar

C)Switching via a bus D) Switching via buffer

9.if a host wants to emit a datagram to all hosts on the same subnet, then the

datagram’s destination IP address is ___B__

A)255.255.255.0 B) 255.255.255.255

C)255.255.255.254 D) 127.0.0.1

10.The advantage of Circuit switching does not include________.

A) small transmission delay B)small Processing cost

C) high link utilization D)no limited to format of message

1.an ARP query sent to __A__

A) local network B) all over the Internet.

2. .packet-switching technologies that use virtual circuits include__B___:

A) X.25, ATM, IP B) X.25, ATM, frame relay.

C) IPX, IP, ATM D) IPX, IP, TCP

3. In Internet, _ D _ protocol is used to report error and provide the information

for un-normal cases.

A) IP B) TCP C)UDP D) ICMP

1．A is a Circuit-switched network.

A. TDM

B. Datagram network

C. Internet

D. virtual circuit network

2．The store-and-forward delay is D

A. processing delay

B. queuing delay

C. propagation delay

D. transmission delay

3．Which is not the function of connection-oriented service D

A. flow control

B. congestion control

C. error correction

D.

reliable data transfer

4．The IP protocol lies in C

A. application layer

B. transport layer

C. network layer

D. link layer

5．Which of the following is the PDU for application layer __B___

A.datagram;

B. message;

C. frame;

D. segment

6．bandwidth is described in _B__

A) Bytes per second B) Bits per second

C) megabits per millisecond D) centimeters

7．A user who uses a user agent on his local PC receives his mail sited in a mail server by using __A__ protocol.

A)SMTP B) POP3

C)SNMP D) FTP

8．As a data packet moves from the lower to the upper layers, headers are B .

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A)Added; B. subtracted; C. rearranged; D. modified

三、填空题（每空1分，共22分 (注意：所有填空题不能写中文，否则中文答案对的情况下扣0.5分)

1. link-layer address is variously called a LAN address, a MAC address, or a physical address.

2 In the layered architecture of computer networking, n layer is the user of n-1 layer and the service provider of n+1 layer.

A) n B) n+3 C) n+1 D) n-1

四、判断题（每小题1分，共10分）

1.√The services of TCP’s reliable data transfer founded on the services of the

unreliable data transfer.

2.√Any protocol that performs handshaking between the communication entities

before transferring data is a connection-oriented service.

3.× HOL blocking occur in output ports of router.

4.√Socket is globally unique.

5.√SMTP require multimedia data to be ASCII encoded before transfer.

6.×The transmission delay is a function of the distance between the two routers.

7.×IP address is associated with the host or router. SO one device only have one IP

address.

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7 8. √ In packet-switched networks, a session’s messages use the resources on demand, and Internet makes its best effort to deliver packets in a timely manner.

9. × UDP is a kind of unreliable transmission layer protocol, so there is not any checksum field in UDP datagram header.

10. √ Forwarding table is configured by both Intra and Inter-AS routing algorithm IP is a kind of reliable transmission protocol . F

8.

Forwarding table is configured by both Intra and Inter-AS routing algorithm. T 9.

Distance vector routing protocol use lsa to advertise the network which router knows. F 10.

RIP and OSPF are Intra-AS routing protocols T 11. Packet switching is suitable for real-time services, and offers better sharing of

bandwidth than circuit switching F

五、计算题 (28 points)

1.Consider the following network. With the indicated link costs, use Dijkstra’s shortest-path algorithm to compute the shortest path from X to all network nodes.

Step N’ D(s),p(s) D(t),p(t) D(U),p(u) D(v),p(v) D(w),p(w) D(y),p(y) 1 X ∞ ∞ ∞

3,x 1, x 7,x 2 xw ∞ ∞

4,w 2,w 7,x 3 xwv ∞

11,v 3,v 3,v 4 xwvu 8,u 5,u 3,v 5 xwvuy 8,u 5,u 6 xwvuyt 6,t 7 xwvuyts

2 Given: an organization has been assigned the network number 198.1.1.0/24 and it needs to define six subnets. The largest subnet is required to support 25 hosts. Please:

Defining the subnet mask; (2分) 27bits or 255.255.255.224

4 7 1 1 3 3 2

5 1 x 9 1

1 u s t

y v w

●Defining each of the subnet numbers; which are starting from 0# (4分)

198.1.1.0/27 198.1.1.32/27 198.1.1.64/27 198.1.1.96/27 198.1.1.128/27 198.1.1.160/27 198.1.1.192/27 198.1.1.224/27

●Defining the subnet 2#’s broadcast add ress.(2分) 198.1.1.95/27

●Defining host addresses scope for subnet 2#. (2分) 198.1.1.65/27--

198.1.1.94/27

3. Consider sending a 3,000-byte datagram into a link that has an MTU of

1500bytes.Suppose the original datagram is stamped with the identification number 422 .Assuming a 20-byte IP header,How many fragments are generated

What are their characteristics(10分)

8

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