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Posted By: RAFI Member Level: Gold Posted Date: 17 Jun 2008
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2006 Indira Gandhi National Open University (IGNOU) B.C.A CS-68 : COMPUTER NETWORKS, JUNE - 2006 Question paper
CS-68 : COMPUTER NETWORKS
JUNE - 2006
Note: Question one is compulsory. Answer any three from the rest.
1. (a) How are dual-ring system used to maintain a link when a station fails? Explain this with the help of a diagram.
(b) Why is a twisted pair not used for LAN connectivity?
(c) For n device in a network, what is the number of cable links required for a mash, ring and star topology, respectively.
(d) Explain the factor which will determine the length of the sliding window
(e) What are three similarities and three differences between OSI and TCP reference models?
(f) Explain the connection establishment and multiplexing in the transport layer protocol.
(g) Explain any three QoS parameters of a transport layer protocol.
2. (a) If a size of a window is 3 bits how many packets can be sent using Go back N without getting an acknowledgement ? Explain your answer.
(b) How does a store and forward system affect the delivery of data traffic? Explain this (c) UDP is a connectionless protocol. Why does it exist? Explain this.
(d) Explain the three differences between CSMA/CD and token ring protocol.
3. (a) Differentiate between hubs, switches and bridges.
(b) A system has a n-layer protocol hierarchy. Applications generate a message of length M bytes. At each layer, an h-byte header is added. What fraction of the network bandwidth is filled with headers, and why?
(c) What are two popular approaches to packet switching? Explain any one of these approaches with the help of a diagram?
4. (a) The physical is a non confirmed service If some data bits ate lost during transmission over the interconnecting media which layer detects their loss and takes recovery action? Explain this?
(b) Explain Source Routing Bridges and write the pseudocode for source Routing Bridges. How are they Different from spanning Three Bridges?
5. (a) What is the difference between IDN and ISDN? Explain the basic services for ISDN Describe five application of ISDN.
(b) Explain the following
(i)Half –Duplex transmission
(ii)Collision
(iii) TELNET
(iv) Quality of Services (QoS)
(v) Remote Procedure call (RPC)
(vi)Piggybacking
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