B.Tech
(U.P.T.U.)
EIGHT
SEMESTER EXAMINATION, 2009-2010
Data
Communication Networks
Q.1
Attempt any two parts of the following: (10*2=20
Marks)
Q.1(a)
Explain the function of the each layer in OSI reference model in
brief .
Q.1(b)
What are the various design issues involved in the data link layer?
Discuss the advantages of sliding window protocol over other data
link protocol.
Q.1(c)
Discuss the packet switching principle. How it is different from
circuit switching ?
Q.2
Attempt any four parts of the following: (5*4=20 Marks)
Q.2
(a) Discuss the medium access control schemes.
Q.2(b)
Explain that the maximum efficiency of pure ALOHA is 1/(2e).
Q.2(c)
An 8 Bit byte with binary value 11000011 is to be encoded using even
parity hamming code. What is the binary value after encoding?
Q.2(d)
How many number of signal level is needed to transmit 128 kbps over
noiseless channel with bandwidth of 20 kHz ?
Q.2(e)
Discuss the operation of HDLC as a bit oriented link control
protocol.
Q.2(f)
Explain the leaky bucket algorithm.
Q.3
Attempt any four parts of the following: (5*4=20
Marks)
Q.3
(a) What is the datagram subnet and virtual circuit subnet?
Differentiate between adaptive and non-adaptive routing.
Q.3
(b) Explain the various causes for congestion in a network.
Q.3
(c) Describe the purpose of ARP and Explain how it works.
Q.3
(d) Explain stop and wait ARQ error control techniques.
Q.3
(e) Explain how a data link layer protocol that manage communication
and packet framing between DTE and DCE device in X.25 network.
Q.4
Attempt any two parts of the following: (10*2=20 Marks)
Q.4
(a) Write short note on the following:
(i)
Electronic mail(SMTP),
(ii)
File Transfer(FTP),
(iii)
Remote login(telnet),
(iv)
Web(HTTP).
Q.4
(b) With the help of suitable example discuss the remote bridges.
Write a brief note on bridge forwarding and filtering.
Q.4
(c) What are the various design issues involved in the network layer?
Explain the different routing algorithm used to route the packets
from source machine to the destination.
Q.5
Attempt any two parts of the following: (10*2=20 Marks)
Q.5
(a) What is 802.11 medium access controls? How it works for the
reliable dat delivery, access control and security?
Q.5
(b) What is IP datagram? Differentiate between IP datagram format and
TCP segment format. How TCP is used for connection oriented reliable
feature to the service of IP? Explain.
Q.5
(c) What is ATM architecture? Where it is Used? Describe various
switching fabrics used to route the cell from a source end point to
the destination end point.
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