What's the Internet: "nuts and bolts"view Protocols control sending Mobile network receiving of msgs Global isp D e.g., Tcp, Ip, Http, Skype Ethernet 口 nternet:" network of Home network Regional IsP networks Loosely hierarchical x Public internet versus Institutional network private intranet 口 Internet standards o RFC: Request for comments 画越 ETF: Internet Engineering Task force Introduction 1-10
Introduction 1-10 What’s the Internet: “nuts and bolts” view ❑ Protocols control sending, receiving of msgs ❖ E.g., TCP, IP, HTTP, Skype, Ethernet ❑ Internet: “network of networks” ❖ Loosely hierarchical ❖ Public Internet versus private intranet ❑ Internet standards ❖ RFC: Request for comments ❖ IETF: Internet Engineering Task Force Home network Institutional network Mobile network Global ISP Regional ISP
What's the Internet: A Service View 口 Communication infrastructure enables distributed applications .o Web, VoIP, email, games e-commerce, file sharing O Communication services provided to apps e Reliable data delivery from source to destination 4 o"Best effort"unreliable) data delivery Introduction 1-11
Introduction 1-11 What’s the Internet: A Service View ❑ Communication infrastructure enables distributed applications: ❖ Web, VoIP, email, games, e-commerce, file sharing ❑ Communication services provided to apps: ❖ Reliable data delivery from source to destination ❖ “Best effort” (unreliable) data delivery
What's a protocol? Human protocols: Network protocols: aWhat'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 msas received order of msgs sent and or other events received among network entities. and actions taken on msg transmission, receipt Introductio 1-12
Introduction 1-12 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
What's a protocol? A human protocol and a computer network protocol TCP connection requesT TCP connection Got the response time? http://www.awl.com/kurose-ross 2:00 fime file Q: Other human protocols? Introduction 1-13
Introduction 1-13 What’s a Protocol? A human protocol and a computer network protocol: Q: Other human protocols? Hi Hi Got the time? 2:00 TCP connection request TCP connection response Get http://www.awl.com/kurose-ross time <file>
Chapter 1: Roadmap 1.1 What is the Internet? 1.2 Network edge O End systems, access networks, links 1.3 Network core a Circuit switching packet switching, network structure 1.4 Delay, loss and throughput in packet-switched networks 1.5 Protocol layers, service models 1.6 Networks under attack: securi 1.7 History Introduction 1-14
Introduction 1-14 Chapter 1: Roadmap 1.1 What is the Internet? 1.2 Network edge ❑ End systems, access networks, links 1.3 Network core ❑ Circuit switching, packet switching, network structure 1.4 Delay, loss and throughput in packet-switched networks 1.5 Protocol layers, service models 1.6 Networks under attack: security 1.7 History