350-801 Question #474: Real Exam Question with Answer & Explanation

Question

An engineer is configuring LLQ in a network and completes the section for identifying different DSCP markings. Which part of the configuration specifies the traffic class for LLQ?

Options

• Aclass map
• Bpolicy map
• Cservice policy
• Daccess list

Explanation

In Cisco QoS configuration, the class map command is used to define and specify the criteria for classifying traffic, which includes matching specific DSCP markings to create a traffic class for Low Latency Queuing (LLQ). This class is then referenced by a policy map.

Common mistakes.

• B. A policy map defines the actions to be taken on traffic classes (e.g., applying LLQ, bandwidth limits), but it does not specify the traffic class itself; it refers to previously defined class maps.
• C. A service policy applies a policy map to an interface, making the QoS configuration active, but it does not define the traffic classes.
• D. An access list (ACL) can be used as a match criterion within a class map to identify traffic, but the class map itself is the component that bundles these criteria to define a traffic class.

Concept tested. LLQ QoS configuration components (class map)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_con_policing/configuration/15-mt/qos-con-policing-15-mt-book/qos-llq.html

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