计算机 网络原理 期末考试 试题及答案
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
注意:这是04-05学期王老师出的试题。大家可以做一做,考试时如果抽到王老师出的题或许对大家就有帮助了。
1.Ethernet使用的MAC协议是(1)。当发生冲突时,将进入二进制指数退避阶段,对于第3次冲突,等待重传的最长时间是512位时间的(2)倍。
(1)A.ALOHA B.CSMA/CD C.CSMA/CA D.CSMA/DD
(2)A.1 B.3 C.5 D.7
2.网络体系结构定义计算机网络的分层结构,TCP/IP模型和ISO/OSI参考模型是两个主要的网络模型,其中TCP/IP协议传送层之上的层是(3)层,而ISO/OSI则是一个(4)层的模型。
(3)A.应用B.表述C.会话D.网络
(4)A.4 B.5 C.6 D.7
3.传统的以太网传输介质是同轴电缆,其中使用粗同轴电缆的网络称为(5)网络,使用细同轴电缆的网络称为(6)网络。10Base-T网络使用的传输介质是无屏蔽双绞线,简称为(7)。
(5)A.5BASE B.10BASE-10 C.10BASE-5 D.10BASE-2
(6)A.5BASE B.10BASE-10 C.10BASE-5 D.10BASE-2
(7)A.UPT B.UTP C.UPP D.UUP
4.有N个节点共享一条总传输速率为R的通信信道,若采用TDMA协议,则每个节点的平均传输速率是(8),而瞬时传输速率则为(9);如果采用FDMA协议,则每个节点的平均传输为(10),而瞬时传输速率则为(11)。
(8)A.R B.R/N C.NR D.2R
(9)A.R B.R/N C.NR D.2R
(10)A.R B.R/N C.NR D.2R
(11)A.R B.R/N C.NR D.2R
5.可靠传输协议rdt3.0的发送和接收窗口都是1,对其进行改进后的GBN协议和SR协议都把发送窗口尺寸扩大为N(>1)。但GBN协议的接收窗口为(12),而SR协议的接收窗口为(13)。对SR协议,若使用k位的序号,则其发送窗口尺寸应(14)。
(12)A.1 B.N/4 C.N/2 D.N
(13)A.1 B.N/4 C.N/2 D.N
(14)A.不大于2k B.等于2k C.不大于2k-1 D.等于2k-1
6.PPP协议可以用在(15)链路上,并使用(16)协议完成链路状态的管理,使用(17)协议完成网络层地址配置和压缩方式协商。
(15)A.多点对多点B.点对点C.点对多点D.任何
(16)A.CNP B.PLC C.LCP D.NCP
(17)A.CNP B.PLC C.LCP D.NCP
7.RTP协议和RTCP协议是TCP/IP协议的(18)层的扩充子层,H.323是(19)层协议。
(18)A.应用层B.传送层C.网络层D.链路层
(19)A.应用层B.传送层C.网络层D.链路层
8.在以太网中,增加帧的尺寸将使信道利用率(20)。
(20)A.提高B.降低C.保持恒定D.无法断定
二、Match the following tasks to one of the TCP/IP layers: (10%)
Route determination ( )
Transmission of Segment ()
ASCII changed to EBCDIC ( )
Frame defined ( )
Transmission of data frame ( )
Provides log-in and logout procedures ( )
Selects a destination network ( )
Provides services for the network applications ( )
Reliable end-to-end data transmission ( )
Provides E-mail and file transfer services ( )
三、Answer the following questions (20%):
(1)Please show an example for every IP V4 address classes. (5%)
A类地址范围(0.0.0.0----127.255.255.255)
B类地址范围(128.0.0.0----191.255.255.255)
C类地址范围(192.0.0.0----223.255.255.255)
D类地址范围(224.0.0.0----239.255.255.255)
E类地址范围(240.0.0.0----255.255.255.255)
(2)Consider IP address 202.203.208.68 . What are the broadcast address and network address when default network mask is used? (5%)
broadcast address :202.203.208.255
network address :202.203.208.0
(3)What are the format and example of IPv6 address?(5%)
(4) Consider plain text “thisisatest” , and the Caesar cipher of k=4 is used. What is the Cipher text after encrypting? (5%)
四、Complete follow problems. (35%)
Suppose we want to transmit the message 10101001 and protect it from errors using the CRC generator x3+1. Use long division to determine the message that should be transmitted.(10%)
2. Consider a CSMA/CD network running at 100Mbps, over a 1000m cable with no repeaters. The signal speed in the cable is 2×108m/sec. What is the minimum frame size for check collision reliably? (10%)
3. Suppose two Ethernet nodes of 10Mbps, A and B, are attached to opposite ends of a 900m cable, and there are 4 repeaters between A and B. If the size of frame is 1000 bits, and the signal propagation speed is 2×108m/s, and each repeater inserts 20-bit delay. (15%)
(1) What is the one-way propagation delay (including repeater delays) between A and B in second ?
(2) How long time is node A’s a frame completely delivered at node B?
五、Consider a LAN shown below and one class C address 202.1.0.0/24 is available only. Please accomplish the following questions: (15%)
Assign IP Network number and netmask for all LANs.