An engineer is designing the QoS strategy for Company XYZ. Based on initial analysis, a lot of scavenger type of traffic is traversing the network's 20Mb Internet link toward the service provider…

Class-based traffic policing enforces a rate limit by dropping or re-marking packets that exceed the configured threshold regardless of available bandwidth or congestion state, rather than using a weighted queuing model to manage class allocations.

Class-based traffic shaping buffers excess packets to smooth traffic to a configured rate but does not use a queuing discipline that proportionally allocates bandwidth across multiple classes during congestion.

CBWFQ allows the engineer to assign exactly 2 Mbps to the scavenger traffic class, and during periods of congestion on the 20 Mbps Internet link, that class is restricted to its configured allocation and cannot consume more bandwidth than assigned. This class-based queuing mechanism directly prevents scavenger traffic from oversubscribing the link while ensuring other classes retain their proportional share of capacity.

LLQ provides a strict priority queue for delay-sensitive traffic such as voice and video, and is designed to protect real-time traffic rather than to impose a bandwidth ceiling on lower-priority scavenger traffic.