An engineer implements QoS in the enterprise network. Which command is used to verity the classification and marking on a Cisco IOS switch?

The command show policy-map interface GigabitEthernet 1/0/1 displays the policy map that is actually bound to the port and, crucially, the runtime counters for every class-map. These counters appear only after packets have been classified and any “set” actions (DSCP/COS marking) have been executed, letting an engineer verify that traffic is entering the intended class and that marking is occurring as configured.

A. show class-map interface … – not a valid IOS syntax; even show class-map shows only definitions, no live statistics or markings.

C. show access-lists – provides ACL match counters; does not reveal QoS classes or DSCP/COS modifications.

D. show policy-map – lists policy contents globally but lacks per-interface packet counters needed to confirm real classification/marking.

1. Cisco IOS XE 17 Quality of Service Command Reference, “show policy-map interface” – description and usage (Section “Monitoring and Maintaining QoS”, p.398).

2. Cisco Catalyst 3850 QoS Configuration Guide, IOS XE 16.12, Chapter “Monitoring QoS”, Example “Verifying Classification and Marking with show policy-map interface” (p.271).

3. Cisco Press – End-to-End QoS Network Design, 2nd ed., Ch.5 “Classification and Marking”, p.182 (ISBN 9781587143694).