Which of the following are common techniques for differentiating service models? (Multiple choice)

Question

Options

• ATraffic speed limiting technology
• BWAN acceleration technology
• CCongestion avoidance technology
• DCongestion management technology

• A
  81% (30)
• B
  19% (7)

Explanation

Differentiating service models in QoS (Quality of Service) means giving different traffic classes different treatment. Traffic speed limiting (A) achieves this by policing or shaping rates per traffic class - some flows get more bandwidth, others are capped. Congestion avoidance (C) techniques like WRED (Weighted Random Early Detection) selectively drop lower-priority packets before queues overflow, preserving higher-priority traffic. Congestion management (D) uses queuing mechanisms (Priority Queuing, WFQ, LLQ) to schedule which traffic class gets served first during congestion - directly implementing differentiated treatment.

WAN acceleration (B) is the distractor because it improves overall link performance through compression, deduplication, and protocol optimization - but it applies uniformly to all traffic rather than differentiating between service classes. It boosts throughput globally; it doesn't classify or prioritize.

Memory tip: Think "DDD vs. ACC" - the three correct answers all Directly Discriminate between Different traffic classes (speed limits, drop probability, queue priority). WAN acceleration Accelerates Connections Collectively - no discrimination, no differentiation.

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