1. Consider a CSMA/CD network running at 1 Gbps over a 1-km calbe with no repeaters. The signal speed in the cable is 200,000km/sec. What is the minimum frame size?(note:1Gbps=1,000,000,000 bits/sec) 2. A TCP machine is sending windows of 65535 bytes over a 1-Gbps channel that has a 10-msec one-way delay.What is the maximum throughput achievable? what is the line efficiency? 3. If message, 01110011001, is send and a special bit pattern,01110, is applied as the leading flag of the message. The generator ploynomial G(x)=x^4+x^2+x+1, is used for CRC examination. 1.Is the CRC check used for error detection or error correction? 2.Find the checksum? 3.If the frame shall be transmitted as --------------------------------------------- |Leading Flag |Message body | CRC checksum | --------------------------------------------- Construct the bit pattern the frame to be transmitted(hint:bit stuffing) 4. The mzsimum payload of a TCP segment is 65495 bytes. Why was such a strange number chosen? 请顺道寄去我信箱...谢谢 --

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