What WAN feature can prioritize real-time, IP-based applications when circuits may be saturated?

Question

Options

• AFRTS
• BLLQ
• CCBWFQ
• DWFQ

• B
  89% (25)
• C
  4% (1)
• D
  7% (2)

Explanation

LLQ (Low Latency Queuing) is specifically designed to prioritize real-time, delay-sensitive traffic like VoIP and video when a link is congested. LLQ combines a strict priority queue with CBWFQ: traffic placed in the priority queue (such as voice) is always serviced first before any other queue, guaranteeing minimal delay and jitter even when the circuit is saturated. CBWFQ (C) alone provides guaranteed minimum bandwidth to each class but uses weighted scheduling with no strict priority, meaning real-time traffic still shares scheduling cycles with other classes - insufficient for VoIP jitter requirements. WFQ (D) provides fairness across flows but has no mechanism to strictly prioritize real-time traffic. FRTS (A) is Frame Relay Traffic Shaping, a congestion management tool for Frame Relay circuits that shapes traffic to CIR/Bc/Be parameters - it does not provide application-aware strict priority queuing for real-time traffic.

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