Designing for Cisco Internetwork Solutions (DESGN, legacy) — Question 54

Which queuing mechanism establishes four interface output queues that will be used for traffic scheduling?

Answer options

• A. Priority queuing (PQ)
• B. First-in, first-out (FIFO)
• C. Weighted fair queuing (WFQ)
• D. Custom queuing (CQ)

Correct answer: A

Explanation

Priority queuing (PQ) is designed to create multiple output queues, specifically four, to facilitate traffic scheduling based on priority levels. In contrast, First-in, first-out (FIFO) processes packets in the order they arrive without prioritization, while Weighted fair queuing (WFQ) manages bandwidth allocation but does not establish a fixed number of queues. Custom queuing (CQ) allows for specific configurations but is not limited to four queues like PQ.