350-401 Question #1147: Real Exam Question with Answer & Explanation

Question

What gives priority on an egress interface, for database traffic that connected on an ingress interface, without changing the CoS value?

Options

• AQoS group
• Bpolicy map
• CCoS map
• Dclass map

Explanation

A policy map is used to define a set of actions on an egress interface, allowing specific traffic like database traffic to be prioritized without altering its CoS value.

Common mistakes.

• A. A QoS group is a locally significant identifier used for internal classification within a device, not directly for prioritizing traffic on an egress interface without a policy map applying an action to it.
• C. A CoS map typically maps CoS values to internal QoS groups or output queues, but it does not independently define how priority is given to traffic without an overarching policy map.
• D. A class map is used to classify traffic based on various criteria, but it only identifies the traffic; it does not apply an action or prioritize it by itself and must be associated with a policy map.

Concept tested. QoS policy map for traffic prioritization

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/xe-3s/qos-plcshp-xe-3s-book/qos-plcshp-pol-map-seq.html

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