Consider a 1000 MIPS computer than can execute one instruction per nanosecond. Suppose that it takes 50 instructions to process a packet header, independent of the payload size and 10 instructions for each 8 bytes of payload. How many packets per second can it process if the packets are (a) 128 bytes and (b) 1024 bytes? What is the goodput in bytes/sec in both cases?
For a 1-Gbps network operating over 4000 km, the delay is the limiting factor, not the bandwidth. Consider a MAN with the average source and destination 20 km apart. At what data rate does the round-trip delay due to the speed of light equal the transmission delay for a 1-KB packet?
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