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Computer Networks MCQ - Computer Networks Section 2

26 In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM

TSI (Time Slot Interchanger) in time division switches consists of random access memory (RAM) with several memory locations. The RAM ills up with incoming data from the time slots in the order received. Hence in time division switches deliver of data is delayed because data must be stored and retrieved from RAM.

27 If a network designer wants to connect 5 routers as point-to-point simplex line, then total number of lines required would be

If 1st router connect with other 4 routers then total for 1st=4 same as 2nd router connect with 3 routers so total for 2nd=3 same as for 3rd router connect with 2 routers so total =2 same as 4th router with 1 so total=1 so total simplex lines will be = 4+3+2+1=10. So answer is 'B'.

28 To interface a computer terminal with a modem, required physical layer standard is

29 A 100 km long cable runs at the T1 data rate. The propagation speed in the cable is half the speed of light. How many bits is in the cable ?

Propagation speed in the cable = 200,000 km/sec = 200 km/psec. Hence 100 km cable will be filled in 500 psec. This corresponds to four 193-bit frames, or 772 bits on the cable.

30 How much bandwith is there in 0.1 micron of spectrum at a wavelength of 1 micron ?

Given :∆ λ= 10^-6, and λ= 10^-6

∆f = (c∆λ)/λ²=30,000 GHz

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Question:

The monitor station in what standard ensures that one and only one token is circulating ?

A. 802.3
B. 802.5
C. Both (a) and (b)
D. All of these

Correct answer: B

Explanation:

Here 802.3 is Ethernet, it uses CSMA/CD. But 802.5 is Token ring. It will have only one token in circulation. These are IEEE standards but FDDI is ANSI…

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