lec-16-17 - What's Next Transport Layer Transport Layer...

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13 Sept 2008  BITS C481 (Computer Networks) 1 What’s Next… Transport Layer Transport Layer Services Multiplexing/Demultiplexing Connectionless and Connection Oriented TCP and UDP Overview of UDP Reliable data transfer Non Pipelined….Done!!! Pipelined……Today!!! Overview of TCP Flow control Congestion control
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13 Sept 2008  BITS C481 (Computer Networks) 2 Performance of rdt3.0 rdt3.0 works, but performance stinks Example: 1 Gbps link, 15 ms end to end prop. delay, 1KB packet: T transmit = 8kb/pkt 10**9 b/sec = 8 microsec U sender : utilization – fraction of time sender busy sending U sender = . 008 30.008 = 0.00027 L / R RTT + L / R = L (packet length in bits) R (transmission rate, bps) = 1KB pkt every 30 msec -> 33kB/sec throughput over 1 Gbps Network protocol limits use of physical resources!
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13 Sept 2008  BITS C481 (Computer Networks) 3 rdt3.0: stop-and-wait operation first packet bit transmitted, t = 0 sender receiver RTT last packet bit transmitted, t = L / R first packet bit arrives last packet bit arrives, send ACK ACK arrives, send next packet, t = RTT + L / R U sender = . 008 30.008 = 0.00027 L / R RTT + L / R =
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13 Sept 2008  BITS C481 (Computer Networks)
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This note was uploaded on 07/20/2009 for the course INFORMATIO BITS C481 taught by Professor Prof.virendrasinghshekhawat during the Fall '08 term at Birla Institute of Technology & Science, Pilani - Hyderabad.

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lec-16-17 - What's Next Transport Layer Transport Layer...

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