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Study Guide Chap 3 B

What types of transmissions use each type o explain

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What types of transmissions use each type? o Explain each protocol. Provide a picture of how they work. o Stop-and-Wait- both sender and receiver use a window size of one, the sender waits for an acknowledgment to send the next one. If an acknowledgment is not received before a timer that is set then the sender keeps a copy and sends again until an acknowledgment is received. o Go-Back-N- sends several packets at once without receiving acknowledgments, once an acknowledgment is received the sliding window moves down and the next packet begins to be sent to the receiver.
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CSIT 220 Study Guide Chapter 3 B Fall 2011 Forouzan Text o Selective Repeat- has a larger window size just as Go-Back-N but only has to resend selective packets, the ones that are actually lost. How are lost packets handled? o If there is no acknowledgement they are discarded and won’t receive any further packets until the lost one is resent What is a checksum? o A value used for error detection. It is formed by adding data units using one’s complement arithmetic and then complementing the result Why are some data headers for UDPs larger than others? o Some of the headers have extra options You should be able to decode a UDP header if you are given the hexadecimal codes and a copy of the headers. You should be able to decode a TCP datagram header if you are given the hexadecimal codes and a copy of the headers.
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  • Spring '12
  • mccoey
  • Transmission Control Protocol, sliding window, window size, error-control protocol, Congestion- excessive network

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