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Posted By: Jaspreet Singh Member Level: Silver Posted Date: 17 Apr 2008
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2007 Punjab Technical University B.E Computer Science Computer Networks ( CS - 303) Question paper
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B-tech.(Sem. - 5th)
Time: 03 Hours Maximum Marks: 60
Instructions:
1)Section-A is Compulsory.
2)Attempt any FOUR questions from section-B.
3)Attempt any TWO questions from section-C.
Section-A
Q1) [10 x 2=20]
a) What are the units of perio and frequency.
b) Can bit rate be less than pulse rate? Why or why not?
c) How is baud rate related to transmission bandwidth in ASK & FSK?
d) How do guided meia differ from unguided media?
e) What are two types of switches used in Circuit switching?
f) What are the main users of ADSL technology?
g) Discuss the concept of redundancy in error detection.
h) Compare datagram and virtual circuits.
i) Differentiate between error control and flow control.
j) Differentiate between FDM and WDM? Which miultiplexing technique use digital signals?
Section-B [4 x 5=20]
Q2) Foethe following frequencies calculate corresponding periods. write the result in
seconds,milliseconds,microseconds,nanoseconds and picoseconds: 24Hz;8Mhz;140KHz;12THz.
Q3) If a bit rate of a signal is 1000 bps,how many bits canbe sent in 5 s? How many bits in 1/5s? How many bits in 100 ms?
Q4) What is the significance of twisting pair cable? why a coaxial cable superior to twisted paircable?
Q5) Compare the mechanism of space division switch to the mechanism of time division switch.
Q6) Compare SDSL and HDSL technologies.
Section-C [2 x 10=20]
Q7) (a) Compare EIA-449 & EIA-530 structures.
(b) How is the STS multiplexer different from an add/drop multiplexer. Since both can add signals?
Q8) (a) Compare frequency hopping spread spectrum & direct sequence spread spectrum.
(b)Is bit padding a technique for FDM or TDM? Is the framing bit used in FDM or TDM?
Q9) Draw and explain TCP/IP protocol architecture and compare it with OSI model.
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