Exam 350-801 topic 1 question 443 discussion

Policing mechanisms include Class-Based Policing and Committed Access Rate (CAR). Traffic policing mechanisms such as Class-based policing or Committed Access Rate (CAR) also have marking capabilities in addition to rate-limiting capabilities. Instead of dropping the excess traffic, traffic policing can alternatively mark and then send the excess traffic. This allows the excess traffic to be re-marked with a lower priority before the excess traffic is sent out. Traffic shapers, on the other hand, do not re-mark traffic; these only delay excess traffic bursts to conform to a specified rate.

The correct answer to the question "CAR is an example of which technique?" is A. traffic policing. This is because CAR (Committed Access Rate) is a traffic policing tool used to limit the input or output transmission rate on an interface based on certain criteria, as mentioned in your document on page 318 under the section on Policing: "Policing tools include class-based policing and committed access rate (CAR). CAR services limit the input or output transmission rate on an interface or subinterface based on a flexible set of criteria

By Definition: "Committed access rate (CAR) is a metric used Internet quality of service (QoS) agreements to classify and limit customer traffic" So it is used to "Limit" traffic

First line "This document clarifies the differences between committed access rate (CAR), which is the Cisco legacy traffic policing feature, and class-based policing, which is the newer Cisco traffic policer." https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/10118-cbpcar.html