Introduction 1 1: Introduction.

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Introduction 2 1: Introduction.

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Introduction 1 1: Introduction

Part I: Introduction Our goal: Overview: Assignment: read chapter 1 in text Our goal: get context, overview, “feel” of networking more depth, detail later in course approach: descriptive use Internet as example Overview: what’s the Internet what’s a protocol? network edge network core access net, physical media performance: loss, delay protocol layers, service models backbones, NAPs, ISPs history 1: Introduction

What’s the Internet: “nuts and bolts” view local ISP company network regional ISP router workstation server mobile millions of connected computing devices: hosts, end-systems pc’s workstations, servers PDA’s phones, toasters running network apps communication links fiber, copper, radio, satellite routers: forward packets (chunks) of data thru network 1: Introduction

“Cool” internet appliances IP picture frame http://www.ceiva.com/ Web-enabled toaster+weather forecaster http://dancing-man.com/robin/toasty/ World’s smallest web server http://www-ccs.cs.umass.edu/~shri/iPic.html 1: Introduction

What’s the Internet: “nuts and bolts” view protocols: control sending, receiving of msgs e.g., TCP, IP, HTTP, FTP, PPP Internet: “network of networks” loosely hierarchical public Internet versus private intranet Internet standards RFC: Request for comments IETF: Internet Engineering Task Force router workstation server mobile local ISP regional ISP company network 1: Introduction

What’s the Internet: a service view communication infrastructure enables distributed applications: WWW, email, games, e-commerce, database., voting, file (MP3) sharing communication services provided: connectionless connection-oriented 1: Introduction