Refer to the exhibit.

R1 is applying policing to incoming packets. Policing is a QoS mechanism that limits the rate of traffic flow by dropping or remarking packets that exceed the configured rate limit. In this case, R1 is applying policing to incoming packets on interface G0/0 and G0/1. The exhibit shows that R1 is configured to police traffic at a rate of AF31, AF21, and AF11. This means that R1 is limiting the rate of traffic flow for these three traffic classes .

Cisco CCNA Certification Guide - Chapter 16: Quality of Service (QoS)

Cisco IOS Quality of Service Solutions Configuration Guide - Configuring Class-Based Policing