Exam 400-007 topic 1 question 250 discussion

traffic shaping > policing > llq > cbwfq?

Correct Answer should be: Traffic Shaping Policing LLQ- LLQ low-latency queuing is developed by Cisco, and it provides strict priority queuing to CBWFQ (class-based weighted fair queueing. Low-latency queuing provides delay-sensitive data like VoIP traffic to be given more preferential treatment over other traffic by letting the data be dequeued and sent first. CB-WFQ - CBWFQ (Class-Based Weighted Fair Queuing) it’s a scheduling mechanism that allows a minimum bandwidth guarantee when the network congestion occurs on an interface.

CBWFQ: "Once a class has been defined according to its match criteria, you can assign it characteristics. To characterize a class, you assign it bandwidth, weight, and maximum packet limit. The bandwidth assigned to a class is the guaranteed bandwidth delivered to the class during congestion." https://www.cisco.com/en/US/docs/ios/12_0t/12_0t5/feature/guide/cbwfq.html

Answer is correct: Traffic Shaping Policing CBWFQ LLQ

Correct order should be: * Traffic Shaping * Policing (When policing is applied to scavenger traffic, it can be used to enforce rate limits on the amount of bandwidth that scavenger traffic can consume.) *CB-WFQ *Low latency queing (Low Latency Queuing (LLQ) allows you to reserve bandwidth for specific traffic classes, ensuring that they receive preferential treatment over other traffic classes during periods of congestion.)

Low-latency queuing (LLQ) is a feature developed by Cisco to bring strict priority queuing (PQ) to class-based weighted fair queuing (CBWFQ). Then it is wrong the answer.