350-801 Question #437: Real Exam Question with Answer & Explanation

The correct answer is A: CBWFQ. To provide priority for voice and video traffic, a Quality of Service (QoS) solution often utilizes Class-Based Weighted Fair Queuing (CBWFQ). CBWFQ allows for defining traffic classes and allocating a minimum bandwidth guarantee for each class.

Media and QoS

Question

What is used to create a QoS solution that delivers priority to voice and video traffic across a network?

Options

ACBWFQ
Btraffic shaping
CDiffServ
Dtraffic policing

Explanation

To provide priority for voice and video traffic, a Quality of Service (QoS) solution often utilizes Class-Based Weighted Fair Queuing (CBWFQ). CBWFQ allows for defining traffic classes and allocating a minimum bandwidth guarantee for each class.

Common mistakes.

B. Traffic shaping is used to buffer and delay packets to ensure a smooth outbound traffic flow, preventing bursts but not inherently prioritizing specific traffic types over others in a comprehensive QoS scheme.
C. DiffServ (Differentiated Services) is a framework for classifying and marking network traffic, but it is not a queuing mechanism itself; it works in conjunction with mechanisms like CBWFQ.
D. Traffic policing drops or re-marks traffic that exceeds a configured rate, enforcing limits rather than guaranteeing bandwidth or prioritizing traffic.

Concept tested. QoS mechanisms for voice/video priority

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/15-mt/qos-plcshp-15-mt-book/qos-plcshp-overview.html

Topics

#QoS#CBWFQ#Voice/Video Priority#Queuing

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