N10-005 Question #956: Real Exam Question with Answer & Explanation

The correct answer is A: Quality of Service. Quality of Service (QoS) queuing mechanisms - such as WFQ (Weighted Fair Queuing), CBWFQ, or LLQ - only activate traffic prioritization when congestion is present. When there is sufficient bandwidth for all traffic, packets flow through immediately without queuing, and QoS classi

Question

Which of the following requires congestion to occur before enabling traffic prioritization?

Options

AQuality of Service
BIGMP snooping
CFlow control
DWAN optimization

Explanation

Quality of Service (QoS) queuing mechanisms - such as WFQ (Weighted Fair Queuing), CBWFQ, or LLQ - only activate traffic prioritization when congestion is present. When there is sufficient bandwidth for all traffic, packets flow through immediately without queuing, and QoS classification has no effect. It is only when the interface or link becomes congested (queues begin to fill) that QoS policies kick in to determine which packets are forwarded first. Flow control (802.3x pause frames) reacts to buffer overflow but doesn't prioritize traffic types. IGMP snooping is for multicast group management, and WAN optimization focuses on compression and caching rather than congestion-triggered prioritization.

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