300-070 Question #73: Real Exam Question with Answer & Explanation

The correct answer is C: policing. Traffic policing is the QoS mechanism configured at network edges to enforce a maximum rate (committed information rate) on incoming or outgoing traffic. When traffic exceeds the defined rate, policing immediately drops or re-marks (downgrades DSCP markings of) the excess packets

Question

Which mechanism is often configured on the edges of a network to control the maximum rate of traffic that is sent or received on an interface and to classify the traffic into priority levels or class of service?

Options

Arouting
Bshaping
Cpolicing
Daccess control
Etraffic regulation

Explanation

Traffic policing is the QoS mechanism configured at network edges to enforce a maximum rate (committed information rate) on incoming or outgoing traffic. When traffic exceeds the defined rate, policing immediately drops or re-marks (downgrades DSCP markings of) the excess packets - it does not buffer them. Policing also classifies traffic into priority levels or classes of service. This is distinct from traffic shaping (option B), which buffers excess traffic to smooth the flow rather than dropping it, making shaping less aggressive but introducing latency. Routing (A) controls path selection, access control (D) manages permit/deny decisions, and 'traffic regulation' (E) is not a standard QoS term. Policing is the standard answer for edge rate enforcement with classification.

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