350-001 Question #118: Real Exam Question with Answer & Explanation

The correct answer is A: with traffic shaping, a router stores excess traffic in packet buffers until bandwidth is available again. Traffic policing and traffic shaping are both rate-limiting mechanisms, but they handle excess traffic differently. (A) is correct: shaping buffers excess traffic in a queue and transmits it when bandwidth becomes available, smoothing the traffic burst rather than discarding it.

Question

Which two of these are differences between traffic policing and traffic shaping? (Choose two.)

Options

Awith traffic shaping, a router stores excess traffic in packet buffers until bandwidth is available again
Bwith policing you can tune the buffer usage for traffic exceeding the specified CIR
Cwith shaping you can tune the buffer usage for traffic exceeding the specified CIR
Dshaping should only be applied for ingress traffic, policing only for egress
Epolicing uses a token bucket algorithm, shaping uses an SPD algorithm

Explanation

Traffic policing and traffic shaping are both rate-limiting mechanisms, but they handle excess traffic differently. (A) is correct: shaping buffers excess traffic in a queue and transmits it when bandwidth becomes available, smoothing the traffic burst rather than discarding it. Policing simply drops or re-marks packets that exceed the configured rate without buffering. (C) is correct: because shaping uses buffers, you can tune buffer parameters for traffic exceeding the CIR - policing has no buffer to tune. (B) is incorrect because policing does not use buffers. (D) is backwards: policing is typically applied to ingress traffic and shaping to egress. (E) is incorrect: both policing and shaping use token bucket algorithms; SPD (Selective Packet Discard) is unrelated to shaping.

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