DCN_rpj25

DCN_rpj25 - NT503: Data Communication & Networking...

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1 Congestion Control Algorithms
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2 Why network congestion occurs ? ± Too many packets cause congestion in the network ± Capability of receiving the packets should be equal to/greater than that of sending packets ± As traffic increases, router may not cope the same, causing congestion, resulting in loss of packets ± Packets will be deleted after time to live field is in IP header elapsed. ± Congestion of a segment will affect the network performance
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3 Why network congestion occurs ? ± If sudden (or bursty) traffic arrives from many sources, queue builds up at the switching node ± If sufficient memory is not there, packets will be lost ± If there is time out of the packet, duplicate packet must be issued. ± Performance may be worst due to duplicate packets, because a router may send duplicate packets to the next router after long time, which increases further the burden on the routers.
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4 Causes of congestion ± Slow processors/ receivers can cause congestion ± Low line bandwidth ± Network delay due to Bursty traffic (e.g. data or video traffic) ± Duplicate packets Effects of congestion: ± Loss of packets ± Degradation of network performance
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This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.

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DCN_rpj25 - NT503: Data Communication & Networking...

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