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2003 Course Computer Networks

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Total No. of Questions : 12] [Total No. of Pages : 3 [3764]-221 P1472 B.E. (E & TC) COMPUTER NETWORKS (2003 Course) (404214) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What are the design issues for the layers? [4] b) What is acknowledged Datagram? What is unreliable datagram? [4] c) Explain Host, Subnet, Service primitives, CSMA/CA technique. [8] OR Q2) a) Explain mesh topology and its applications. What is extended Star topology. [4] b) Explain Broadcasting and Multicasting in Networks. [4] c) Explain Cut through and Store-forward modes in layer-2 switch. Show the position of Repeater, Bridge, Router and Application gateway wrt ISO - OSI reference model. [8] Q3) a) Draw & Explain the setup required & steps required for establishing internet communication using Dial up modem. [4] b) Explain Circuit Switching Vs Packet Switching. [4] c) What is ADSL technology? Also define VDSL, HDSL, SDSL, & DSLAM. [8] P.T.O. OR Q4) a) Draw and Explain typical cable TV system. How cable video signal and Internet data can be send over the same cable. [4] b) Compare LEO Vs MEO Vs GEO. [4] c) Explain Nyquist theorem and Shanon capacity theorem. What are different line codes used in Ethernet, Fast Ethernet & Gigabit Ethernet communication. [8] Q5) a) Explain Go-back-N and Selective repeat techniques. What is the concept of Window size. [6] b) Explain Aloha, CSMA/CD & CSMA/CA briefly. [6] c) Explain the DQDB system Vs LAN system. [6] OR Q6) a) Explain any one collision free protocol? What is full duplex switched Ethernet? [6] b) Explain the Gigabit Ethernet system and its requirements in detail. [6] c) Draw frame formats of IEEE 802.3 and IEEE 802.5. Also draw the connection between IEEE 802.3 and IEEE 802.5 networks through suitable device. [6] SECTION - II Q7) a) Explain Distance vector routing algorithm & Link state routing algorithm. [8] b) Consider a TCP connection is transferring a file of 7000 bytes. The first byte is numbered 11001, what are the sequence numbers for each segment if data are sent in five segments, each carrying 1000 bytes? [4] c) Draw and explain the TCP header in detail. [4] OR Q8) a) Draw and explain the IP header in detail. What is fragmentation? Explain with example. [8] b) Draw and explain the UDP header in detail, list the different TCP port addresses used in Internet communication. [4] c) What is network congestion? What are the reasons? How one can overcome it? [4] [3764]-221 2 Q9) a) Explain the RSA algorithm with example. Also explain the DES algorithm briefly. [8] b) What are the types of firewall? How proxy server acts as Firewall? [4] c) Compare public key Vs private key cryptography? What is passive and active intruder? [4] OR Q10)a) Draw & Explain the Local client communicating with Google.com website through college proxy server without college DNS server installed in college Campus LAN. Also explain the component of DNS System. [8] b) What is sockets address? Write Socket address of web server for PRIVATE IP addresses in class - B & class-D IP version-4 addresses. [4] c) Write a simple HTML program to host your own web page on Local web server as index.html or home.html. [4] Q11)a) Draw & Explain the use of port 20 and port 21 in FTP communication between system-A and system-B connected via layer-2 switch in LAN environment. Compare FTP and TFTP briefly. [6] b) Role of SMTP in Email System? What are SNMP components? c) What are multicasting applications? Write details of the respective protocol? [6] Q12)a) [6] OR Draw & Explain the DHCP set-up among 7(Seven) computer systems on LAN using layer-2 CISCO switch. Consider Class-A private IP version-4 addresses are to be allocated. Explain importance of Traceroute utility in Internet communications? [6] b) Explain the IPV-6 specialities about jumbogram, address range & Fragmentation. Also explain the details of service field in IPV - 4 header. [6] c) Explain the role of NFS and RPC in TCP/IP communication specially in LAN environment. [6] Y [3764]-221 3

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