The University of SydneyPage 6What’s a protocol?human protocols:–“what’s the time?”–“I have a question”–introductions… specific messages sent… specific actions taken when messages received, or other eventsnetwork protocols:§machines rather than humans§all communication activity in Internet governed by protocolsprotocolsdefine format, orderof messages sent and receivedamong network entities, and actions takenon message transmission, receipt