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Chapter 5. The Network Layer > Congestion Control Algorithms

5.3. Congestion Control Algorithms

When too many packets are present in (a part of) the subnet, performance degrades. This situation is called congestion. Figure 5-25 depicts the symptom. When the number of packets dumped into the subnet by the hosts is within its carrying capacity, they are all delivered (except for a few that are afflicted with transmission errors) and the number delivered is proportional to the number sent. However, as traffic increases too far, the routers are no longer able to cope and they begin losing packets. This tends to make matters worse. At very high trafffic, performance collapses completely and almost no packets are delivered.

Figure 5-25. When too much traffic is offered, congestion sets in and performance degrades sharply.



  

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