What does the service-policy statement do?
A.
Maps a type of traffic and QoS feature to an interface.
B.
Maps a QoS feature to a type of traffic.
C.
Differentiates types of traffic.
D.
Differentiates QoS features.
Explanation:
For the service policy, only two options affect functionality: input and output. There is also a history option, not covered here in detail because it is for information only and does enable you to configure any functionality.
Example
R1(config-if)# service-policy ?
history Keep history of QoS metrics
input Assign policy-map to the input of an interface
output Assign policy-map to the output of an interface
The input option means that the policy map is applied to traffic that enters the router through this interface, and the output option means that the policy map is applied to traffic that leaves the router through this interface. The ability to apply a policy map input or output on a specific interface depends on which QoS mechanisms are used in the policy map. Some actions are only allowed in output policies.