2007级计算机网络基础试卷及答案

1、集 美 大 学 试 卷 纸2009 2010 学年 第 二 学期课程名称计算机网络基础试卷卷别A适 用学院、专业、年级信息与计算科学2007级，数学与应用数学2007级，应用物理学2008级，光信息科学与技术2008级考试方式闭卷 开卷 备注答案请写在答题纸上，否则视为不得分。一、选择题(共 30 分，每小题 2 分,选择符合题目要求的答案)。1.Which of the following topologies are considered logical topologies? (Choose two.)a. broadcast b. star c. token-passing d. hi

2、erarchical e. bus f. mesh 2.Which of the following describe Ethernet MAC addresses? (Choose three.)a. 6 pairs of hex digits b. logical host address c. physical address d. 48 hex digits e. 32 bit network and 48 bit host address f. 24 bit OUI and 24 bit serial number 3.What is the name of the Layer 2

3、Protocol Data Unit(PDU)?a. data b. bit c. packet d. segment e. frame 4. Which combinations of charges will be repelled by electric force? (Choose two.)a. positive and positive b. negative and negative c. neutral and neutral d. neutral and negative e. positive and negative f. neutral and positive 5.

4、Which type of cable has the color of the wires in pins #1 and #2 on one end appear on the other end at pins #3 and #6.a. straight-through cable b. hub connector cable c. rollover cable d. console cable e. crossover cable 6. Which items are contributors to latency in a switched network? (Choose two.)

5、a. incorrect MAC addressing b. circuit delays c. software delays d. too many collision domains 7. Which switching mode results in the lowest amount of latency and provides no error checking?a. store-and-forward b. cut-through c. synchronous d. fragment-free 8. Which TCP/IP layer provides services th

6、at support a logical connection between the sending and receiving hosts?a. application b. transport c. ip d. network e. presentation 9. In what ways are the TCP/IP and OSI models the same? (Choose three.)a. Both assume circuit-switched networks. b. Both have similar transport and network layers. c.

7、Both have an application layer d. Both have a physical layer. e. Both have network access and data-link layers. f. Both assume packet-switched networks. 10. What does TCP use to begin the three-way handshaking process?a. The destination host sends an ACK segment. b. The sending host sends a SYN and

8、ACK segment. c. The destination host sends a SYN segment. d. The sending host sends a SYN segment.11. Which of the following characteristics of TCP is provided by windowing?a. well-known ports b. flow control c. best-effort delivery d. connectionless data transport12. Which of the following services

9、 is used to translate a web address into an IP address?a. dhcp b. telnet c. wins d. dns 13.In the network shown in the accompanying graphic, where would it be appropriate to use private addressing ?a. only area b b. areas c and b c. only area c d. areas a and c e. areas a and b and c f. only area a

10、14. Several solutions have been developed to expand the number of IP addresses available for public use. Which technologies are solutions? (Choose three.)a. classlfull routing b. classless interdomain routing c. ipv10 d. Network Address Translation e. IPv6 f. a new 64 bit addressing scheme15. Which

11、layer is considered to be the host-to-network layer of the TCP/IP modela. application b. transport c. presentation d. data link e. network access二、填空题（共 14 分，每空 2 分)1. 在以太网中，ip的做用是 _1_识别_和_2_定位_2. TCP通过使用_3_流量控制_和_4_滑动窗口_来提供拥塞（overflows）控制3. 日常生活使用的无线网络802.11N最高速度可以达_5 300Mbps_4. 对于在不同网段的两台主机，在数据的传输

12、过程中，从源主机发送后，到目的主机接收前，数据所经过的OSI模型的最高层是_6_网络层_5. 在微软系列操作系统中，我们可以使用_7_tracert _命令来跟踪从源主机到目的主机所经过的路由器地址。三、简答题(共 15分，每小题5分)。1. 请指出下列IP分别属于ABCDE类的那一类？210.34.1591CBAD E2. 请指出下面的协议(protocol)分别属于TCP/IP模型(model)的哪一层（layer） http应用层ICMP网际层UDP传输层ARP网际层POP3应用层3. 四、简述题(共 15 分,每小题5分)。1. 请以OSI七层模型为例，说明在网络通信

13、过程中，如何保证数据的可靠性的。2. 网段分成两个字网，由于客户端(client)子网掩码设置错误,都设成，造成两个子网不能正常通信，请解释1) 子网掩码的作用2) 不能通信的原因（从ARP的角度）3. 请解释数据到传输层后(包括传输层)，物理层前，这些层对数据封装（encapsulation）过程五、实践题(共 26 分，第一小题5分，信计数学专业：第二小题15分第三小题6分|物理光电专业：第二小题10分，第三小题6分，第四小题5分）。某网络的拓扑图如上所示，请根据此图完成下列问题。1. 1) 当数据从host1到外网(如)，经过NAT服务器时，数据的源IP地址由_(1)_变为_(2)_.2

14、) 当host1对外访问获取的数据，从外回来，经过NAT服务器时,数据的目的IP地址由_(3)_变为_(4)_3) 在IPV4网络中除了安全原因，使用 NAT的最主要原因是_(5)_2. 对子网1按要求进行子网划分。1) 要求说明每个子网的网络地址，子网掩码，广播地址。2) 子网1所对应的路由器的三个接口所对应的IP是什么3. 对于IPV6，其地址生成有其相应的规律，假设一网络所对应的IPV6网络地址部分为：2001:250:0000:0059，其中一台主机的MAC地址为: 00-13-D3-02-F7-30请问:1) 通过以上信息可以生成的IPV6地址是2001 : 250 : 0000 : 0059 : 0213 ：d3ff ：fe02 : f7302) 其IPV6地址的简化形式为2