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A protocol is a set of rules governing a time sequence of events that must take place

  • A.between peers
  • B.between  an interface
  • C.between modems
  • D.across an interface

Answer: D

Correct answer: across an interface

A protocol governs the exchange at the boundary between two entities, so the sequence of events it specifies takes place across an interface. The phrasing matters: peers communicate through an interface, and the rules apply at it.

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