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400-007 · Question #87
400-007 Question #87: Real Exam Question with Answer & Explanation
The correct answer is A: small transactions (HTTP-like behavior). Traffic placed in the LLQ priority queue must consist of small, predictable transactions to avoid queue monopolization, and must be intolerant to jitter since strict priority scheduling is specifically designed to eliminate queuing delay variation.
Question
Which two application requirements are mandatory tor traffic to receive proper treatment when placed in the priority queue? (Choose two.)
Options
- Asmall transactions (HTTP-like behavior)
- BWRED drop treatment
- Ctolerance to packet loss
- Dintolerance to jitter
- ETCP-based application
Explanation
Traffic placed in the LLQ priority queue must consist of small, predictable transactions to avoid queue monopolization, and must be intolerant to jitter since strict priority scheduling is specifically designed to eliminate queuing delay variation.
Common mistakes.
- B. WRED (Weighted Random Early Detection) is a congestion avoidance mechanism applied to non-priority queues; traffic in the strict priority queue is never subject to WRED drops.
- C. Traffic in the priority queue should be intolerant to packet loss, not tolerant - loss-tolerant traffic does not require the special treatment of strict priority scheduling and should be placed in lower queues.
- E. TCP-based applications are poor candidates for the priority queue because TCP retransmission, windowing, and slow-start mechanisms interact poorly with strict priority scheduling; UDP real-time traffic such as VoIP is the intended use case.
Concept tested. LLQ priority queue traffic suitability requirements
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