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1024-byte packet a 128-byte header and a 4-byte checksum

Suppose a network transmits 1024-byte packets containing a 128-byte header and a 4-byte checksum. If a workstation on the network is guaranteed to be able to transmit at least one packet every x time units,

(1) what maximum amount of time, as a function of x, should be required (based on these factors) to transfer a 3MB file from a server to a workstation?

(2) what is the effective transfer rate from the server to the workstation?

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(1) 3MB = 3*1024*1024 = 3145728 bytes

The number of effective bytes contained in each ...