Which of the following should be performed if a service provider does not want packets to make use of the shared buffer space when queued?

Question

Options

• ASet the CBS to 0.
• BSet the MBS equal to the CBS.
• CSet the high-priority-only equal to the MBS.
• DSet the MBS to 0.
• ESet the high-priority-only to 0.

• A
  11% (3)
• B
  82% (23)
• C
  4% (1)
• E
  4% (1)

Explanation

Setting MBS equal to CBS eliminates the delta between maximum and committed buffer space, which is precisely what defines the shared buffer region - with no gap between the two values, there is no shared space available for queued packets to occupy.

Why the distractors are wrong:

• A (CBS to 0): Removing the committed buffer actually increases dependence on shared buffers, since nothing is reserved.
• C (high-priority-only = MBS): This restricts shared buffer access to high-priority traffic only - it doesn't remove shared buffer usage entirely.
• D (MBS to 0): Setting MBS to zero eliminates all buffering (committed and shared), causing immediate drops rather than simply preventing shared buffer use.
• E (high-priority-only to 0): This opens shared buffer to all traffic, the opposite of the goal.

Memory tip: Think of it as a hotel analogy - CBS is your reserved room, MBS is the total rooms you're allowed. If MBS = CBS, you've used up your entire allocation with your reservation, leaving zero "overflow" shared rooms to borrow.

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