Week 7 - Week7 22:02 InternetLayering Content o...

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Week 7 22:02 Internet Layering Content o Web pages, videos, blogs Applications o Email, file transfer, streaming, IM Transport TCP Network Physical Peering FCC   Verizon    Layering + Peering FCC Webpage  Application   TCP   IP   Lan-link   Routers o Lan   IP   TCP   Applications   Own Computer TCP : end to End TCP     TCP
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Problems with source rate o Two problems with sources transmitting too many packets per second: Destination might not be able to process received packets that fast Destination buffer may overflow Routers in between source and destination may experience congestion Controlling the source rate o 1. Solution: Destination slow down source rate to match destination rate called “flow control” o 2.  Solution: Router Slow down rates of sources causing congestion called “congestion control” Internet Transport Layer o Two options at transport Layer: User Datagram Protocol (UDP) No flow control (at transport layer) No congestion control (at transport layer) i.e. no transport layer mechanism to slow down source Transmission Control Protocol (TCP) Provides flow control at transport layer
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Provides congestion control i.e. source may be slowed down to destination speed or destination  at router UDP Flow and Congestion control No flow or congestion control at transport layer o No UDP flow control: Source application layer must implement its OWN flow control
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This note was uploaded on 04/20/2011 for the course ECON 11 taught by Professor Abob during the Spring '11 term at UC Irvine.

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Week 7 - Week7 22:02 InternetLayering Content o...

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