Punjab Technical University 2007-5th Sem B.E Computer Science COMPUTER NETWORKS (CS-303) (-2k7) - Question Paper

Paper ID [CS 303]

B.Tech (Semester 5th)

COMPUTER NETWORKS (CS - 303)

Time Allowed : 03 Hours
Maximum Marks : 60

Instruction to candidates
1) part - A is compulsory.
2) Attempt any 4 ques. from part - B
3) Attempt any 2 ques. from part - C.

part - A
(10 x two = 20)

Q1)

a) elaborate the units of Period and Frequency?

b) Can the bit rate be less than the pulse rate?

c) How is the baud rate related to the transmission bandwidth in ASK and FSK?

d) How do guided media differ from unguided media?

e) elaborate the 2 kinds of switches used in circuit switching?

f) elaborate the main uses of ADSL technology?

g) explain the concept of redundancy in fault detection?

h) Compare datagram and virtual circuits.

i) Differentiate ranging from fault control and flow control.

j) Differentiate ranging from FDM and WDM. Which multiplexing technique uses various signals?


part - B
(4 x five = 20)

Q2) For the subsequent frequencies compute the corresponding periods. Write the outcome in seconds, milliseconds, nanoseconds and picoseconds : 24Hz; eight MHz; 140 KHz; 12 THz.

Q3) If the bitrate of the signal is 1000 bps, how many bits can be sent in 5s? How many bits in 1/5s ? How many bits in 100ms ?

Q4) What is the significance of twisting in twisted-pair cable? Why is coaxial cable superior to twisted-pair cable ?

Q5) Compare the mechanism of the space division switch to the mechanism of a time division switch.

Q6) Compare SDSl and HDSL technologies.


part - C
(2 x 10 = 20)

Q7)
(a) Compare EIA-449 & EIA-530 structures.
(b) How is the STS multiplexer various from an add/drop multiplexer. Since both can add signals ?

Q8)
(a) Compare Frequency Hopping Spread Spectrum and 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 discuss TCP/IP protocol architecture and compare it with OSI model.

Earning:   Approval pending.