350-801 Question #265: Real Exam Question with Answer & Explanation

Question

Which characteristic of distributed class-based weighted fair queueing addresses jitter prevention?

Options

• Alt provides additional granularity by allowing a user to create classes
• BIt minimizes jitter by implementing a priority queue for voice traffic
• CIt uses a priority queue for voice traffic to avoid jitter
• DIt provides additional granularity by allowing a user to define custom classes

Explanation

The ability of distributed class-based weighted fair queuing (DCBWFQ) to provide additional granularity by allowing users to create classes is a fundamental characteristic that enables effective jitter prevention for specific traffic types.

Common mistakes.

• B. This describes the function of Low Latency Queuing (LLQ), which provides a strict priority queue for voice traffic, but it is not an inherent characteristic of standard CBWFQ itself, which focuses on weighted fairness among classes.
• C. Similar to choice B, this directly describes LLQ, which provides a strict priority queue for voice traffic to minimize jitter, rather than a core characteristic of standard CBWFQ.
• D. This choice is nearly identical to A, describing the ability to define custom classes, which is a key aspect of the granularity offered by CBWFQ.

Concept tested. DCBWFQ traffic classification for QoS

Reference. https://www.cisco.com/c/en/us/td/docs/ios/qos/configuration/guide/qos_c_book/qos_cbwfq.html

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