Chapter 1:roadmap -What is the Internet? ■What is a protocol? Network edge:hosts,access network, physical media Network core:packet/circuit switching,internet structure Performance:loss,delay,throughput Security Protocol layers,service models ■History Introduction:1-9 Chapter 1: roadmap Introduction: 1-9 ▪ What is the Internet? ▪ What is a protocol? ▪ Network edge: hosts, access network, physical media ▪ Network core: packet/circuit switching, internet structure ▪ Performance: loss, delay, throughput ▪ Security ▪ Protocol layers, service models ▪ History