An engineer is describing QoS to a client. Which two facts apply to traffic policing? (Choose two.)

Question

Options

• APolicing adapts to network congestion by queuing excess traffic.
• BPolicing should be performed as close to the destination as possible.
• CPolicing drops traffic that exceeds the defined rate.
• DPolicing typically delays the traffic, rather than drops it.
• EPolicing should be performed as close to the source as possible.

• A
  4% (1)
• B
  4% (1)
• C
  92% (22)

Explanation

Traffic Policing Explained

Why C and E are correct: Traffic policing enforces a defined rate limit by dropping packets that exceed the configured threshold (C), making it a strict enforcement mechanism. It should be applied as close to the source as possible (E) so that non-compliant traffic is discarded before it consumes bandwidth across the network, protecting downstream resources.

Why the distractors are wrong:

• A describes traffic shaping, not policing - shaping buffers/queues excess traffic to smooth it out rather than drop it.
• B is the opposite of best practice; applying policing near the destination wastes network bandwidth carrying traffic that will ultimately be dropped.
• D again describes shaping behavior - delaying (buffering) traffic is the defining characteristic of shaping, not policing.

Memory Tip: Think of policing as a strict bouncer at the door - if you exceed the limit, you're dropped immediately at the entrance (source). Shaping is more like a waiting room - excess traffic waits in a queue. Use the phrase "Police = Drop at Source" to lock in both correct answers (C and E).

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