Feb02 - CSE398: Network Systems Design Instructor: Dr....

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CSE398: Network Systems Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering Lehigh University February 2, 2005
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 02/02/05 Outline ± Recap ± TCP, UDP, application layer protocols ± Computer hardware architecture ± Summary and homework
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 02/02/05 Software-based Network System ± Uses conventional hardware (e.g., PC) ± CPU, memory, bus, I/O devices ± Software ± Runs the entire system ± Allocates memory ± Controls I/O devices ± Performs all protocol processing
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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 02/02/05 Bus ± Bus: b/w I/O and CPU & Memory ± All components contend for use ± Parallel wires (K+N+C total) ± An address of K bits ± A data value of N bits (width of the bus) ± Control information of C bits ± Wider bus ± Transfers more data per unit time ± Costs more ± Requires more physical space ± Compromise: multiplex
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Instructor: Dr. Liang Cheng
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Feb02 - CSE398: Network Systems Design Instructor: Dr....

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