A network engineer is designing a QoS policy for voice and video applications. Which software queuing feature provides strict-priority servicing?

Question

Options

• AClass-Based Weighted Fair Queuing
• BLow Latency Queuing
• CLink Fragmentation
• DAutomatic QoS

• B
  88% (14)
• C
  6% (1)
• D
  6% (1)

Explanation

Low Latency Queuing (LLQ) is correct because it combines a strict-priority queue with Class-Based Weighted Fair Queuing (CBWFQ), guaranteeing that delay-sensitive traffic like voice and video is always serviced first before any other queue - this is the definition of strict-priority servicing.

Why the distractors are wrong:

• A (CBWFQ) allocates bandwidth by class using weighted fairness, but it has no strict-priority queue - all classes are treated relatively equally based on weight, making it insufficient alone for real-time traffic.
• C (Link Fragmentation and Interleaving) is a technique that breaks large packets into smaller fragments to reduce serialization delay on slow links - it is not a queuing mechanism.
• D (Automatic QoS) is a simplified configuration tool (like Cisco's auto qos) that applies QoS policies automatically, but it is not itself a queuing feature that provides strict-priority servicing.

Memory Tip: Think of LLQ = "VIP Lane" - voice and video packets always cut to the front of the line. The word "Low Latency" is your clue: strict priority = lowest possible delay for critical traffic.

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