When allocating scheduling resources, which of the following statements BEST describes how the egress port scheduler allocates bandwidth?

Question

Options

• AThe egress port scheduler takes the ratio of requested bandwidth to total bandwidth request from
• BThe egress port scheduler allocates bandwidth based on a WRR distribution method that takes
• CThe egress port scheduler allocates bandwidth on a first come, first served distribution method
• DThe egress port scheduler will limit the bandwidth offered to the egress port based on the over-
• EThe egress port scheduler will use the Russian Dolls Method to allocate bandwidth to each level

• B
  93% (27)
• D
  3% (1)
• E
  3% (1)

Explanation

Option B is correct because the egress port scheduler uses a Weighted Round Robin (WRR) distribution method, which allocates bandwidth to queues proportionally based on configured weights - ensuring each queue receives a fair, predictable share of available bandwidth rather than a flat or arbitrary distribution.

Why the distractors are wrong:

• A describes a simple ratio calculation (requested vs. total bandwidth), which is not how WRR operates - WRR uses pre-assigned weights, not dynamic request ratios.
• C (first come, first served / FIFO) provides no bandwidth differentiation or QoS guarantees, making it unsuitable for priority-based scheduling.
• D describes traffic policing or shaping (limiting bandwidth offered), which is a separate QoS mechanism, not the scheduler's distribution method.
• E (Russian Dolls Method) refers to a hierarchical scheduling technique used in nested/multi-level queue structures - a valid concept, but not how a standard egress port scheduler distributes bandwidth.

Memory tip: Think of WRR like a weighted voting system - each queue gets "votes" proportional to its weight, and bandwidth is awarded accordingly each scheduling cycle. If a queue has twice the weight, it gets served twice as often. "W in WRR = Weight = Who gets more bandwidth."

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