JEE Mains

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JEE Mains

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Let G(x) be the generator polynomial used for CRC checking. What is the condition that should be satisfied by G(x) to detect odd number of bits in error?

5 points

G(x) contains more than two terms

G(x) does not divide 1+x^k, for any k not exceeding the frame length

1+x is a factor of G(x)

G(x) has an odd number of terms

Clear selection

Frames of 1000 bits are sent over a 10^6 bps duplex link between two hosts. The propagation time is 25ms. Frames are to be transmitted into this link to maximally pack them in transit (within the link). What is the minimum number of bits (i) that will be required to represent the sequence numbers distinctly? Assume that no time gap needs to be given between transmission of two frames.

5 points

i = 2

i = 3

i = 4

i = 5

Clear selection

Consider the data of previous question. Suppose that the sliding window protocol is used with the sender window size of 2^i where is the number of bits identified in the previous question and acknowledgments are always piggybacked. After sending 2^i frames, what is the minimum time the sender will have to wait before starting transmission of the next frame? (Identify the closest choice ignoring the frame processing time.)

10 points

16ms

18ms

20ms

22ms

Clear selection

In Ethernet when Manchester encoding is used, the bit rate is:

5 points

Half the baud rate

Twice the baud rate

Same as the baud rate

None of the above

Clear selection

In a token ring network the transmission speed is 10^7 bps and the propagation speed is 200 metres/micro second. The 1-bit delay in this network is equivalent to:

5 points

500 metres of cable

200 metres of cable

20 metres of cable

50 metres of cable

Clear selection

Determine the maximum length of the cable (in km) for transmitting data at a rate of 500 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/s.

5 points

2.5

Clear selection

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