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Suppose that a wireless link layer using a CSMA-like protocol backs off 1ms on average.

A packet’s link and physical layer headers are always set at the same bitrate and take a

total of 125us to transmit. If a packet is sent with a link layer payload of 1000 bytes at

a bitrate of 1Mbps, what overhead do the physical and link layers introduce? Calculate

overhead as the fraction of the complete packet time taken up by backoff and link/physical layer headers.

Can someone help me out and explain the solution. I'm stuck here.

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