Chapter 1-3

* Chapter 1: Introduction

Our goal:

* get “feel” and terminology

* more depth, detail later in course

* approach:

* use Internet as example

Overview:

* what’s the Internet?

* what’s a protocol?

* network edge; hosts, access net, physical media

* network core: packet/circuit switching, Internet structure

* performance: loss, delay, throughput

* Security (skip)

* protocol layers, service models

* History (skip)

* 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

* What’s the Internet: “nuts and bolts” view

* millions of connected computing devices: hosts = end systems

* running network apps

* “Cool” internet appliances

* 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

* 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?

network protocols:

* all communication activity in Internet governed by protocols

* Protocol comparison!!!

a human protocol and a computer network protocol:

* Chapter 1: roadmap

1.1 What is the Internet?

1.2 Network edge

* end systems, access networks, links

1.3 Network core

*...