Chapter 1 Computer Networks computer and the Internet networking James F.Kuros Keith W.Ross A note on the use of these ppt slides: Computer Networking: (including this one)and slide content to suit your needs.They obviously A Top Down Approach represent a lot of work on our part.In retum for use,we only ask the following: Featuring the Internet f you use these slides (e.g.,in a class)in substantially unaltered form, 3rd edition. that you mention their source (after all,we'd like people to use our book!) If you post any slides in substantially unaltered form on a ww site,that Jim Kurose,Keith Ross you note that they are adapted from(or perhaps identical to)our slides,and Addison-Wesley,July note our copyright of this material. 2004. Thanks and enjoy!JFK/KWR All material copyright 1996-2004 J.F Kurose and K.W.Ross,All Rights Reserved Introduction 1-1
Introduction 1-1 Chapter 1 Computer Networks and the Internet Computer Networking: A Top Down Approach Featuring the Internet, 3rd edition. Jim Kurose, Keith Ross Addison-Wesley, July 2004. 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: ❑ 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!) ❑ 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 1996-2004 J.F Kurose and K.W. Ross, All Rights Reserved
Chapter 1:Introduction Our goal: Overview: ▣get context, ▣what's the Internet overview,"feel"of 口what's a protocol?: networking ▣network edge 口more depth,detail ▣network core later in course access net,physical media ▣approach: Internet/ISP structure o descriptive performance:loss,delay o use Internet as example protocol layers,service models ▣history Introduction 1-2
Introduction 1-2 Chapter 1: Introduction 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 ❑ Internet/ISP structure ❑ performance: loss, delay ❑ protocol layers, service models ❑ history
Chapter 1:roadmap 1.1 What is the Internet? 1.2 Network edge 1.3 Network core 1.4 Network access and physical media 1.5 Internet structure and ISPs 1.6 Delay loss in packet-switched networks 1.7 Protocol layers,service models 1.8 History Introduction 1-3
Introduction 1-3 Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge 1.3 Network core 1.4 Network access and physical media 1.5 Internet structure and ISPs 1.6 Delay & loss in packet-switched networks 1.7 Protocol layers, service models 1.8 History
What's the Internet:"nuts and bolts"view millions of connected CX router 燮 computing devices: workstation 目server hosts end-systems mobile o PCs workstations,servers cal ISP o PDAs phones,toasters running network apps ▣communication links … o fiber,copper,radio,satellite o transmission rate bandwidth routers:forward packets (chunks of data) company network Introduction 1-4
Introduction 1-4 What’s the Internet: “nuts and bolts” view ❑ millions of connected computing devices: hosts = end-systems PCs workstations, servers PDAs phones, toasters running network apps ❑ communication links fiber, copper, radio, satellite transmission rate = bandwidth ❑ routers: forward packets (chunks of data) local ISP company network regional ISP router workstation server mobile
What's the Internet:"nuts and bolts"view x protocols control sending, 燮 router workstation receiving of msgs 目server oe.g.,TCP,IP,HTTP,FTP,PPP 是mobile Internet:"network of cal ISP networks" YO o loosely hierarchical o public Internet versus … private intranet ▣Internet standards o RFC:Request for comments O IETF:Internet Engineering Task Force company network Introduction 15
Introduction 1-5 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 local ISP company network regional ISP router workstation server mobile
What's the Internet:a service view communication infrastructure enables distributed applications: o Web,email,games,e-commerce, database.,voting,file (MP3) sharing communication services provided to applications: o connectionless o connection-oriented Introduction 1-6
Introduction 1-6 What’s the Internet: a service view ❑ communication infrastructure enables distributed applications: Web, email, games, e-commerce, database., voting, file (MP3) sharing ❑ communication services provided to applications: connectionless connection-oriented
What's a protocol? human protocols: network protocols: 口"what's the time?" ▣machines rather than ▣"I have a question" humans ▣introductions 口all communication activity in Internet ..specific messages sent governed by protocols ..specific actions taken protocols define when messages format,order of messages received,or other sent and received among events network entities,and ▣actions taken on the transmission/receipt of a message Introduction 1-7
Introduction 1-7 What’s a protocol? human protocols: ❑ “what’s the time?” ❑ “I have a question” ❑ introductions … specific messages sent … specific actions taken when messages received, or other events network protocols: ❑ machines rather than humans ❑ all communication activity in Internet governed by protocols protocols define ❑ format, order of messages sent and received among network entities, and ❑ actions taken on the transmission/receipt of a message
What's a protocol? a human protocol and a computer network protocol: TCP connection req Hi TCP connection Got the +response time? Get http://www.awl.com/kurose-ross -2:00 file> Q:Other human protocols? Introduction 1-8
Introduction 1-8 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 req TCP connection response Get http://www.awl.com/kurose-ross time
A closer look at network structure: ▣network edge: applications and hosts ▣network core: o routers o network of networks ▣access networks, physical media: communication links Introduction 1-9
Introduction 1-9 A closer look at network structure: ❑ network edge: applications and hosts ❑ network core: routers network of networks ❑ access networks, physical media: communication links
Chapter 1:roadmap 1.1 What is the Internet? 1.2 Network edge 1.3 Network core 1.4 Network access and physical media 1.5 Internet structure and ISPs 1.6 Delay loss in packet-switched networks 1.7 Protocol layers,service models 1.8 History Introduction 1-10
Introduction 1-10 Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge 1.3 Network core 1.4 Network access and physical media 1.5 Internet structure and ISPs 1.6 Delay & loss in packet-switched networks 1.7 Protocol layers, service models 1.8 History