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9 Cards in this Set
- Front
- Back
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When does Congestion occur |
When too much traffic is offered, performance will degrade due to loss/retransmissions |
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Goodput |
The rate at which useful packets are delivered in the network |
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How to handle Congestion |
Depends on the timescale (the rate of data being transmitted). Lower data is preventative the higher you you have to be reactive |
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What are the 5 different time scales? |
1) Network Provisioning 2) Traffic-Aware-Routing 3) Admission Control 4) Traffic Throttling 5) Load Shedding |
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Network Provisioning |
Build a network that matches the traffic it will carry |
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Traffic-Aware-Routing |
Choose routes based on traffic not only topology Eg: Traffic heading East to West take path A-B |
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Admission Control |
Only allow new traffic load if you have enough capacity Can combine with traffic aware routing to use the un congested portion of a virtual circuit |
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Traffic Throttling |
Congested routers signal hosts to slow down traffic ECN (Explicit congestion Notification) marks the packets and receiver returns signal to sender |
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Load Shedding |
Drop packets Link by link: rapid relief End to end: Slower but better at targeting the cause of congestion |
