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CS470 Network Engineering and Management
Instructor: Dr. Howard Liu howard@mail.npu.edu

Introduction

1-1

Chapter 1 Introduction

A note on the use of these ppt slides:
We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: q  If you use these slides (e.g., in a class) in substantially unaltered form, that you mention their source (after all, we d like people to use our book!) q  If you post any slides in substantially unaltered form on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2009 J.F Kurose and K.W. Ross, All Rights Reserved

Computer Networking: A Top Down Approach , 5th edition. Jim Kurose, Keith Ross Addison-Wesley, April 2009.

Introduction

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Chapter 1: Introduction
Our goal:
q  get feel and

Overview:
q  what s the Internet? q  what s a protocol? q  network edge; hosts, access

terminology q  more depth, detail later in course q  approach: v  use Internet as example

net, physical media q  network core: packet/circuit switching, Internet structure q  performance: loss, delay, throughput q  security q  protocol layers, service models q  history Introduction 1-3

Chapter 1: roadmap
1.1 What is the Internet? 1.2 Network edge
q  end systems, access networks, links

1.3 Network core

q  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 Introduction 1-4

What s the Internet: nuts and bolts view
PC server wireless laptop cellular handheld

q  millions of connected

Mobile network Global ISP

computing devices: hosts = end systems v  running network apps

Home network Regional ISP

links v  fiber, copper, access points radio, satellite wired links v  transmission rate = bandwidth q  routers: forward router packets (chunks of data)

q  communication

Institutional network

Introduction

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Cool internet appliances
Web-enabled toaster + weather forecaster IP picture frame http://www.ceiva.com/

World s smallest web server http://www-ccs.cs.umass.edu/~shri/iPic.html

Internet phones
Introduction 1-6

What s the Internet: nuts and bolts view
q  protocols control sending,
Mobile network Global ISP

receiving of msgs
v 

e.g., TCP, IP, HTTP, Skype, Ethernet

q  Internet: network of

Home network Regional ISP

networks
v  v 

loosely hierarchical public Internet versus private intranet

Institutional network

q  Internet standards v  RFC: Request for comments v  IETF: Internet Engineering Task Force Introduction 1-7

What s the Internet: a service view
q  communication

infrastructure enables distributed applications: v  Web, VoIP, email, games, e-commerce, file sharing q  communication services provided to apps: v  reliable data delivery from source to destination v  best effort (unreliable) data delivery Introduction 1-8

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 Introduction 1-9

What s a protocol?
a human protocol and a computer network protocol: Hi Hi
Got the time?

TCP connection request TCP connection response
Get http://www.awl.com/kurose-ross

2:00 time Q:...
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