Traffic assigned to forwarding classes is placed into queues, while the contents of the queues are serviced in a controlled manner using____________.

Question

Options

• AWRED
• Bshapers
• Cschedulers
• Dmarkers
• Eweighted fair queues (WFQ)

• A
  4% (2)
• B
  2% (1)
• C
  92% (48)
• E
  2% (1)

Explanation

Schedulers are the mechanism that controls how queue contents are serviced - they determine the order, timing, and bandwidth allocation when dequeuing packets for transmission (e.g., Strict Priority, Weighted Round Robin). WRED (A) is a congestion avoidance technique that proactively drops packets to prevent queues from filling, not a queue-servicing mechanism. Shapers (B) delay traffic to conform to a defined rate limit, operating on output rather than governing queue service order. Markers (D) operate earlier in the QoS pipeline, setting header bits (like DSCP) to classify traffic - they never touch queues. WFQ (E) is a specific type of scheduler, making it a tempting trap; the question asks for the general category, which is "schedulers."

Memory tip: Think of it as a restaurant - forwarding classes are the sections (VIP, regular), queues are the waiting lines, and schedulers are the host deciding who gets seated next and how fast. Shapers, markers, and WRED are the bouncers and reservation system - they work before or around the line, not at the counter.

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