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speeds of lans and computers, local are networks operate at a rate so fast that a computer's central processing unit (cpu) cannot process bits at network speed ( this is the result of the number of instruction required for each bit). the difference between the speed of the cpu and the speed of the network is a fundamental problem. despite the difference between processor and network speeds, networks are designed to operate at highest rate possible. furthermore, the speed at which a network operates is usually fixed in the designed--the speed does not depend on the cpu rates of the attach computer.