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Unacked pkt sender window - PowerPoint PPT Presentation

CSC 250

CSC 250

CSC 250. Introduction to Networking Fundamentals Class Meeting 7. Approach: incrementally develop sender, receiver sides of reliable data transfer protocol (rdt) consider only unidirectional data transfer but control info will flow on both directions!

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694 views • 55 slides
End to End Protocols

End to End Protocols

End to End Protocols. End to End Protocols. Last week: basic protocols Stop & wait (Correct but low performance) Today: Window based protocol. Go Back N Selective Repeat TCP protocol. UDP protocol. Next week: Flow control & congestion control. rdt3.0: Stop-and-Wait Operation.

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646 views • 51 slides
Lecture 8

Lecture 8

Lecture 8. Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012. CS3516: These slides are generated from those made available by the authors of our text. 3.4 principles of reliable data transfer 3.2 multiplexing and demultiplexing

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611 views • 46 slides
rdt2.1: sender, handles garbled ACK/NAKs

rdt2.1: sender, handles garbled ACK/NAKs

Wait for ACK or NAK 0. Wait for call 1 from above. Wait for ACK or NAK 1. rdt2.1: sender, handles garbled ACK/NAKs. rdt_send(data). sndpkt = make_pkt(0, data, checksum) udt_send(sndpkt). rdt_rcv(rcvpkt) && ( corrupt(rcvpkt) || isNAK(rcvpkt) ). Wait for call 0 from above.

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989 views • 22 slides
rdt2.2: a NAK-free protocol

rdt2.2: a NAK-free protocol

same functionality as rdt2.1, using ACKs only instead of NAK, receiver sends ACK for last pkt received OK receiver must explicitly include seq # of pkt being ACKed duplicate ACK at sender results in same action as NAK: retransmit current pkt. rdt2.2: a NAK-free protocol.

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Performance of rdt3.0

Performance of rdt3.0

rdt3.0 works, but performance stinks example: 1 Gbps link, 15 ms e-e prop. delay, 1KB packet:. fraction of time sender busy sending. =. = 0.00015. Utilization = U = . 8kb/pkt. T. =. 8 microsec. = 8 microsec. transmit. 10**9 b/sec. 30.016 msec. Performance of rdt3.0.

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225 views • 11 slides
Performance of rdt3.0

Performance of rdt3.0

rdt3.0 works, but performance stinks example: 1 Gbps link, 15 ms e-e prop. delay, 1KB packet:. fraction of time sender busy sending. =. = 0.00015. Utilization = U = . 8kb/pkt. T. =. 8 microsec. = 8 microsec. transmit. 10**9 b/sec. 30.016 msec. Performance of rdt3.0.

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198 views • 11 slides

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