While configuring a QoS policy, analysis of the switching infrastructure indicates that the switches support 1P3Q3T egress queuing. Which option describes the egress queuing in the infrastructure?

The correct answer is C. The 1P3Q3T indicates one priority queue, three standard queues, and three thresholds. The notation 1P3Q3T is a Cisco QoS queuing descriptor that breaks down as follows: '1P' = one strict Priority Queue (typically for real-time traffic such as voice), '3Q' = three standard weighted queues for other traffic classes, and '3T' = three drop thresholds per standard…

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Question

Options

AThe threshold configuration allows for inter-queue QoS by utilizing buffers.
BThe priority queue must contain real-time traffic and network management traffic.
CThe 1P3Q3T indicates one priority queue, three standard queues, and three thresholds.
DThe priority queue should use less than 20% of the total bandwidth.

How the community answered

(34 responses)

A
6% (2)
C
91% (31)
D
3% (1)

Explanation

The notation 1P3Q3T is a Cisco QoS queuing descriptor that breaks down as follows: '1P' = one strict Priority Queue (typically for real-time traffic such as voice), '3Q' = three standard weighted queues for other traffic classes, and '3T' = three drop thresholds per standard queue (used with WRED or tail-drop for congestion management). This gives a total of four egress queues (1 priority + 3 standard). The thresholds apply per queue, not across queues. The priority queue is generally reserved for voice/real-time, not network management traffic. There is no fixed '20% bandwidth' rule for the priority queue.

Topics

#QoS#egress queuing#1P3Q3T#priority queue

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