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Difficulty: EasyQoS Per-Hop Behaviors, Classification, Marking, Queuing, and Traffic Shaping/Policing

A network engineer needs to manage egress bandwidth on a WAN interface. The goal is to smooth out traffic bursts by holding excess packets in a buffer for later transmission rather than immediately dropping them when traffic exceeds the configured rate limit. Which Quality of Service (QoS) mechanism should the engineer configure?

  1. Traffic shapingAnswer
  2. B
    Traffic policing
  3. C
    Class-Based Weighted Fair Queueing
  4. D
    DSCP re-marking

Answer

Traffic shaping is the QoS mechanism that buffers excess packets in a queue to smooth out traffic bursts and enforce a maximum output rate.
Traffic shaping smooths out traffic rate spikes by queuing (buffering) excess packets and scheduling them for delayed transmission. This prevents packet loss during brief traffic spikes.

Step-by-Step Solution

1
Identify the key requirement described in the scenario
The requirement is to smooth traffic bursts by holding extra packets in memory (buffering) for later transmission instead of dropping them.
Distinguishing between buffering excess packets versus dropping them is the fundamental operational difference between traffic shaping and traffic policing.
2
Select the appropriate QoS tool that implements packet buffering for rate control
Traffic shaping uses queues to buffer bursty traffic, smoothing the output rate profile to match the configured bandwidth ceiling.
Traffic shaping prevents packet drops during transient spikes at the cost of minor queuing latency.

Key Concept

Traffic Shaping vs. Traffic Policing Mechanics
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Topics

QoS Per-Hop Behaviors, Classification, Marking, Queuing, and Traffic Shaping/Policing

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