Question Bank - Computer Networks

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Frames of 1000 bits are sent over a 106 bps duplex link between two hosts. The propagation time is 25 ms. 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 the transmission of two frames.

A.
i = 2
B.
i = 3
C.
i = 4
D.
i = 5

Solution:

Data:Bandwidth = 106 bpsPropagation time = 25 msCalculation:In 1 second, 106 bits can be sent? 1 s ? 106 b1 ms ? 103 b25 ms ? 25 × 103 bFrame size = 1000 bitsNumber of frames = ?(25 × 103) ÷ (1000)?? Number of frames = 25 Minimum number of bits = i = ?log2 25? = 5

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