CCIE Pursuit Blog

October 23, 2008

Question Of The Day: 23 October, 2008

Yesterday’s QoD:

Which of the following is NOT an example of congestion management?

Here are the results:

Answer %
Resource Reservation Protocol (RSVP) 55%
FIFO queuing 40%
Weighted fair queuing (WFQ) 4%
Priority queuing (PQ) 1%

The answer: Resource Reservation Protocol (RSVP)

Congestion Management
Congestion management features operate to control congestion once it occurs. One way that network elements handle an overflow of arriving traffic is to use a queuing algorithm to sort the traffic and then determine some method of prioritizing it onto an output link. Each queuing algorithm is designed to solve a specific network traffic problem and has a particular effect on network performance.

The Cisco IOS software congestion management, or queuing, features include the following:

•FIFO queuing
•Priority queuing (PQ)
•Frame Relay permanent virtual circuit (PVC) interface priority queuing (FR PIPQ)
•Custom queuing (CQ)
•Weighted fair queuing (WFQ) and distributed WFQ (DWFQ)
•Class-based WFQ (CBWFQ) and Distributed CBWFQ (DCBWFQ)
•IP RTP Priority
•Frame Relay IP RTP Priority
•Low Latency Queuing (LLQ)
•Distributed LLQ (DLLQ)
•LLQ for Frame Relay

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