Click the exhibit button below. Given this scheduler-policy configuration, which of the following can be said about the scheduler called "high"? (Choose two)

Question

Exhibit

Options

• AIt is a parent scheduler.
• BIt is the top-level scheduler.
• CIt can allocate up to 50 Mbps of bandwidth to scheduler "low" since the bandwidth is not used by
• DIt is a child scheduler.
• EIt can only have queues as children.

• A
  84% (31)
• B
  3% (1)
• C
  5% (2)
• E
  8% (3)

Explanation

In hierarchical scheduling policies, a single scheduler can simultaneously occupy both a parent and a child role when it sits in the middle of the hierarchy. "High" is a child (D) because it has a scheduler above it (it is not at the root), and it is also a parent (A) because it has children (schedulers or queues) beneath it.

Why the distractors fail:

• B is wrong because the top-level scheduler has no parent - since "high" is a child (D), it cannot also be the root.
• C is wrong because unused bandwidth allocation rules depend on the specific policy configuration and parent-child relationships; "high" cannot arbitrarily donate its unused bandwidth to a sibling like "low."
• E is wrong because parent schedulers can have other schedulers as children (not just queues) - that's precisely why "high" qualifies as a parent.

Memory tip: Think of hierarchical schedulers like a corporate org chart - the CEO is top-level (no parent), entry-level staff are leaf nodes (no children/queues only), but a middle manager is both a child of the CEO and a parent of their team. If a scheduler is neither at the very top nor at a leaf, it's always both A and D.

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