350-401 Question #861: Real Exam Question with Answer & Explanation

Question

Which Quality of Service (QoS) mechanism allows the network administrator to control the maximum rate of traffic received or sent on a given interface?

Options

• APolicing
• BMarking
• CQueueing
• DClassification

Explanation

Policing is the correct answer because it is the QoS mechanism specifically designed to enforce a maximum rate limit (bandwidth cap) on traffic flowing in or out of an interface - dropping or remarking packets that exceed the defined threshold.

Marking (B) is incorrect because it involves tagging packets with a priority value (e.g., DSCP or CoS bits) to influence how they are treated downstream, but it does not control traffic rate. Queueing (C) is incorrect because it manages the order in which packets are forwarded when congestion occurs, prioritizing certain traffic - it does not set a maximum rate. Classification (D) is incorrect because it simply identifies and categorizes traffic into groups based on criteria like IP addresses or protocol type, which is a prerequisite to other QoS actions but applies no enforcement.

🧠 Memory Tip: Think of Policing like a traffic police officer setting a speed limit - if you go over the limit, there are consequences (packets are dropped or remarked). This helps distinguish it from Queueing, which is more like managing lanes of traffic already on the road.

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