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2003 Course Computer Networks

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Total No. of Questions : 12] [Total No. of Pages :3 [3864] - 261 B.E. (E & Tc) COMPUTER NETWORKS (2003 Course) (404214) P1145 Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer three questions from section I and three questions from section II. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule, mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Give the detailed comparison of OSI and TCP/IP Reference models for Networks. [8] Explain how and when a Hub, Switch and Routers are used to expand a network. [4] Explain Client Server Model. [4] OR Q2) a) Explain the TCP/IP model with protocols at each layer [8] b) c) Explain in brief physical address, network address and port number.[4] Differentiate between wired and Wireless network. [4] Q3) a) What is dial up modem technology? Explain in brief V .32 and V .90 modem standards with data rates. [8] What is the maximum data rate for a telephone line with BW 3.1 kHz and 30db SNR? [4] Give the brief description of the application and limitations of the twisted pair cable, coaxial cable, fiber optic cable and microwaves. [4] b) c) OR P.T.O. Q4) a) b) c) Q5) a) b) c) Q6) a) b) c) Explain the cable TV network. Also explain in brief how video signal and internet data can be send over the same cable. [8] Explain bandwidth division in ADSL and the Discrete Multitone modulation technique used in ADSL. [4] What is the maximum bit rate for a telephone line with BW 3500Hz and 30db SNR? [4] Draw & Explain the HDLC & PPP frame format. [8] Explain Go Back N ARQ protocol and Selective Repeat ARQ protocol. [6] What is the framing concept in Data Link Layer?. Explain any one in details. [4] OR Consider a 64 Kbps geostationary satellite channel is used to send 512 byte data frames in one direction, with a very short acknowledgement coming back the other way. What is the maximum throughput for window size of 1, 7, 15 and 127 using sliding window protocol? [8] Explain CSMA and CSMA/CD [6] Explain 802.3 MAC frame. [4] SECTION - II Q7) a) b) c) In token bucket system calculate the required parameters in following two different cases. i) Computer system on a 6Mbps network is regulated by a token bucket is filled at a rate of 2Mbps. it is initially filled to capacity 12Mbit . How long can the computer system transmit at full rate of 6Mbps. ii) Network processing computer on a 10 Mbps network is regulated by a token bucket. It is initially filled to capacity 18Mbit. Time taken by Network processing computer to transmit at full rate of 10 Mbps is 3 sec. At what rate the token bucket should be filled up?[8] Explain the link state routing in detail. [4] What are different static routing algorithms? Explain any one in detail.[4] OR Q8) a) b) c) What are different transport service primitives? Also explain the five main categories of the transport layer functions. [8] Explain QoS at transport layer. [4] Define delay, congestion, throughput & jitter. [4] [3864] - 261 -2- Q9) a) b) Draw and explain basic encryption model. What is Transposition cipher? [8] What is DNS? What are three main components of DNS? [4] c) What is the function of SMTP and POP-3 protocols in Email system?[4] OR Q10)a) b) c) Compare public key and private key security algorithm. Explain RSA algorithm in detail. [8] Write a short note on WWW . [4] What is HTML? How to write web page in HTML? [4] Q11)a) b) Write short note on IPv6. [6] Explain Telnet and FTP in detail wrt server & Client communication.[6] c) Explain ARP and RARP in detail. [6] OR Q12)a) b) c) What are the different types of private IP addresses according to IANA? Give multicasting IP address range & write its applications? [6] Explain ICMP, IGMP & SNMP briefly. [6] Explain TFTP, BOOTP & RPC briefly. [6] ***** [3864] - 261 -3-

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