What's a protocol? human protocols: network protocols: g“what's the time?” machines rather than “|have a question” humans introductions all communication activity in Internet ..specific msgs sent governed by protocols specific actions taken when msgs received, protocols define format, or other events order of msgs sent and received among network entities,and actions taken on msg transmission,receipt Introduction 1-8Introduction What’s a protocol? human protocols:  “what’s the time?”  “I have a question”  introductions … specific msgs sent … specific actions taken when msgs received, or other events network protocols:  machines rather than humans  all communication activity in Internet governed by protocols protocols define format, order of msgs sent and received among network entities, and actions taken on msg transmission, receipt 1-8