計算機網(wǎng)絡(luò)與通信期末考試_畢業(yè)生【教學(xué)相關(guān)】

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1、 四 川 大 學(xué)期 考 試 試 題（A） （200 ——200 學(xué)年第 2 學(xué)期） 課程號：30306230 課序號：0 ~3 課程名稱：計算機網(wǎng)絡(luò)與通信 任課教師： 等 成績： 適用專業(yè)年級： 學(xué)生人數(shù)： 印題份數(shù)： 學(xué)號： 姓名： 考 試 須 知 四川大學(xué)學(xué)生參加由學(xué)校組織或由學(xué)校承辦的各級各類考試，必須嚴(yán)格執(zhí)行《四川大學(xué)考試工作管理辦法》和《四川大學(xué)考場規(guī)則》。有考試違紀(jì)作弊行為的，一律按照《四川大學(xué)學(xué)生考試違紀(jì)作弊處罰條例》進行處理。 四川大學(xué)各級各類考試的監(jiān)考人員，必須嚴(yán)格執(zhí)行《四

2、川大學(xué)考試工作管理辦法》、《四川大學(xué)考場規(guī)則》和《四川大學(xué)監(jiān)考人員職責(zé)》。有違反學(xué)校有關(guān)規(guī)定的，嚴(yán)格按照《四川大學(xué)教學(xué)事故認定及處理辦法》進行處理。 第一題 第二題 第三題 第四題 第五題 總分 一、英譯漢（10分） 1. TCP 2. SMTP 3.ISP 4.ICMP 5.OSPF 6. CRC 7. CSMA/CD 8. ARP 9. DHCP 10.MTU 二、單項選擇題 （每小題l分，共30分) 1. The physical layer is concerned

3、with the transmission of over the physical medium. A. Program; B. dialogs; C: protocols; D. bits 2. As a data packet moves from the lower to the upper layers, headers are . A. Added; B. subtracted; C. rearranged; D. modified 3. What is the main function of the

4、transport layer? 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 198.0.46.201? A.255.0.0.0; B.255.255.0.0;

5、 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. IP ; B. MAC; C. source; D.ARP 6 . Bridges function is in the layer. A. physical; B. data link; C. network; D. A and B 7. UDP

6、needs the address to deliver the user datagram to the correct application program. A. port; B. application; C. internet; D. physical 8. The definition of reliable delivery includes . A. Error-free delivery; B. Receipt of the complete message C In-or

7、der delivery; D. All of the above 9. At 100BASE-T,“T”is A. Fiber Optics B. baseband Coaxial cable C. broadband Coaxial cable D. Twisted-pair 注：1試題字跡務(wù)必清晰，書寫工整。 本題 4 頁，本頁為第 1 頁 2 題間不留空，一般應(yīng)題卷分開 教務(wù)處試題編號： 3務(wù)必用A4紙打印

8、 10. is not element of a protocol。 A. words B. Syntax C. Semantics D. Timing 11. There are two broad classes of packet-switched networks: datagram networks and virtual-circuit networks. The virtual-circuit networks f

9、orward packets in their switches use ______. A) MAC addresses B) IP addresses C) e-mail addresses D) virtual-circuit numbers 12 TCP service model doesn’t provide __________service. A) reliable transport service B) flow control service

10、C) congestion-control service D) guarantee a minimum transmission rate service. 13. The purpose of TCP port number is ______________ A)provide flow control B) provide congestion control C) identify the receiving process D) identify destination host . 1

11、4. A user who uses a user agent on his local PC receives his mail sited in a mail server by using ____ protocol. A)SMTP B) POP3 C)SNMP D)FTP 15. Considering sliding-window protocol, if the size of the transmitted window is 1 and the size of th

12、e receiving window is 1,the protocol is A) stop-and-wait protocol B) Go-Back-N protocol C) selective Repeat protocol D) alternating-bit protocol 16. which IP address is ineffective_________. A) 202.131.45.61 B) 127.0.0.1 C)

13、192.168.0.2 D) 290.25.135.12 17. if IP address is 202.130.191.33, subnet mask is 255.255.255.0,then subnet prefix is_______ A) 202.130.0.0 B) 202.0.0.0 C) 202.130.191.33 D)202.130.191.0 18.The traceroute is impl

14、emented with ________messages A) DNS B) ICMP C) ARP D) RIP 19. Which layer-function is mostly implemented in an adapter（NIC）? __________ A) physical layer and link layer B) network layer and transport layer C)physical layer and network layer D) tr

15、ansport layer and application layer 20. If a user brings his computer from chengdu to beijing, and accesses Internet again. Now, _______ of his computer needs to be changed. A) MAC address B) IP address C) e-mail address D) user address 三、填空題 （每空1分，共2

16、0分?） 1.The Internet provides two services to its distributed applications: a connection-oriented service and a unreliable service. a. connectionless; b. reliable 2. please fill in the types of delay in a router. 注：1試題字跡務(wù)必清晰，書寫工整。 本題 4 頁

17、，本頁為第 2 頁 2 題間不留空，一般應(yīng)題卷分開 教務(wù)處試題編號： 3務(wù)必用A4紙打印 ① ③ A router processing B ④ ② A) processing delay B) queuing delay C) transmission delay D) propagation delay 3. please fill

18、in encapsulate unit and internet protocol stack encapsulate unit M M M Ht Ht Hn M Ht Hn Hl message 5 6 7 Application layer ① ② ③ ④ 4 In the layered architecture of computer networking, ( ) layer is the user of ( ) layer and the service provider of ( ) layer. A) n B)

19、 n+3 C) n+1 D) n-1 5.Among the Internet application protocols, ( ) protocol supports the Web service, ( ) protocol supports the Electronic mail, ( ) protocol supports the Internet’s directory service, ( ) protocol supports the remote file transfer. A) SMTP B) PPP C) TCP D) DNS E) FTP F

20、) DHCP G) HTTP 四、判斷題（每小題1分，共10分） 1. The size of the TCP RcvWindow never changes throughout the duration of the connection. ( ) 2. Any protocol that performs handshaking between the communication entities before transferring data is a connection-oriented service. 3. A browser is a user agen

21、t for the Web. 4. Socket is the programming interface between the application and the network 5. FTP sends control information ”in-of-band”. 6. It isn’t possible for an application to enjoy reliable data transfer even when the application runs over UDP. 7. An ARP query is sent to all over the I

22、nternet. 8. MSS is the limit for the size of IP packet. 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 五、計算題 (30 points) 1.Consider th

23、e following network. With the indicated link costs, use Dijkstra’s shortest-path algorithm to compute the shortest path from S to all network nodes. 注：1試題字跡務(wù)必清晰，書寫工整。 本題 4 頁，本頁為第 3 頁 2 題間不留空，一般應(yīng)題卷分開 教務(wù)處試題編號： 3務(wù)必用A4紙打印 2 t z

24、 14 4 y 9 1 1 6 2 s v 1 3 1 x 4 u 1 3 w Step N’ D(t),p(t) D(U),p(u) D(v),p(v) D(w),p(w) D(x),p(x) D(y),p(y) D(z),p(z) 1 s 2 3 4 5 6

25、 7 8 9 2. Suppose a ISP has been allocated the address block 202.12.168.0/24, now if the ISP wants to divide its address block into 6 equal-sized subnet address blocks, and each subnet could include 25 hosts. 1) Please utilize CIDRiz

26、ed addresses, determine the length of subnet portion of address.(namely, how many bits should be extend?(2 分 ) 2) Please write out the subnet 2#’s network prefix(2分) and subnet mask.(2分) 3) Please write out the subnet 2#’s broadcast address.(2分) 4) Please write out the subnet 2#’s range of host a

27、ddress.（2分） 3. 1)Suppose Host A is sending a large file over a TCP connection. As shown below. What is put in the sequence number and acknowledgment fields of the segments? 2)A few seconds after the user sending a large file, the user types the letter ’T’. After typing the letter’ T’, how many

28、 segments are sent, and what is put in the sequence number and acknowledgment fields of the segments? Please continue to draw the diagram. Note that write the sequence number and acknowledgment number. A Seq=100,ACK=500,20bytes data Seq =①,ACK=②, 注：1試題字跡務(wù)必清晰，書寫工整。 本題 4 頁，本頁為第 4 頁 2 題間不留空，一般應(yīng)題卷分開 教務(wù)處試題編號： 3務(wù)必用A4紙打印 5 試題和教育