QoS Queues

Question 1

First in, first out(FIFO)

Answer 1

A single queue with packets being processed in the exact order in which they arrived

Question 2

Priority queuing (PQ)

Answer 2

This is not really a good queuing method because lower-priority queues are served only when the higher-priority queues are empty. There are only four queues, and low-priority traffic many never be sent.

Question 3

Custom queuing (CQ)

Answer 3

With up to 16 queues and round-robin scheduling, CQ prevents low-level queue, starvation and provides traffic guarantees, But doesn’t provide strict priority for real-time traffic.

Question 4

Weighted fair queuing (WFQ)

Answer 4

Divides up the bandwidth by the number of flows, which provided bandwidth for all applications. This was great for real-time traffic, but it doesn’t offer any quarantees for a particular flow.

Question 5

Class-based weighted fair queuing (CBWFQ)

Answer 5

Provides fairness and bandwidth guarantees for all traffic, but it does not provide latency guarantees and is typlically only used for data traffic management

Question 6

Low latency queueing(LLQ)

Answer 6

CBWFQ but with stricter priorities for real-time traffic.