What's a protocol? human protocols network protocols: 口" what's the time? 口 machines rather than 口" i have a question" humans 口 introductions 口 all communication activity in Internet specific msgs sent governed by protocols specific actions taken protocols define format, when msgs received order of msgs sent and or other events received among network entities. and actions taken on msg transmission, receipt Introduction 1-14Introduction 1-14 What’s a protocol? human protocols: q “ what’s the time?” q “I have a question” q introductions … specific msgs sent … specific actions taken when msgs received, or other events network protocols: q machines rather than humans q 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