300-360 Question #40: Real Exam Question with Answer & Explanation

The correct answer is C: 5. DSCP value 46 corresponds to Expedited Forwarding (EF), which is the DSCP marking used for real-time voice traffic. In the QoS mapping hierarchy, DSCP EF (46) maps to IEEE 802.1p Class of Service (CoS) value 5. This CoS value is then placed into the priority queue - Queue 5 - whi

Question

A network engineer is configuring QoS with a DSCP value of 46. To which queue must the CoS be mapped for priority queuing of the voice frames?

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Explanation

DSCP value 46 corresponds to Expedited Forwarding (EF), which is the DSCP marking used for real-time voice traffic. In the QoS mapping hierarchy, DSCP EF (46) maps to IEEE 802.1p Class of Service (CoS) value 5. This CoS value is then placed into the priority queue - Queue 5 - which provides the lowest latency and highest scheduling priority. This ensures voice frames are dequeued and forwarded before other traffic types. The mapping chain is: DSCP 46 (EF) → CoS 5 → Priority Queue 5.

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