Ch1 - EEE 459 C m om unication Ne tworks S pring 2007 Prof...

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Introduction 1-1 EEE 459 Communication Networks Spring 2007 Prof. M. Reisslein Chapter 1 Introduction Textbook: Computer Networking: A Top Down Approach Featuring the Internet, 3 rd edition. Jim Kurose, Keith Ross Addison-Wesley.
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Introduction 1-2 Chapter 1: Introduction Our goal: get “feel” and terminology moredepth, detail later in course approach: useInternet as example Overview: what’s theInternet what’s a protocol? network edge network core access net, physical media Internet/ISP structure performance: loss, delay protocol layers, servicemodels network modeling
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Introduction 1-3 Chapter 1: roadmap 1.1 What is theInternet? 1.2 Network edge 1.3 Network core 1.4 Network access and physical media 1.5 Internet structureand ISPs 1.6 Delay & loss in packet-switched networks 1.7 Protocol layers, servicemodels 1.8 History
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Introduction 1-4 What’s the Internet: “nuts and bolts” view millions of connected computing devices: hosts = end systems 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
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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
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Introduction 1-6 What’s the Internet: a service view communication infrastructure enables distributed applications: Web, email, games, e-commerce, file sharing communication services provided to apps: Connectionless unreliable connection-oriented reliable
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Introduction 1-7 What’s a protocol? human protocols: “what’s thetime?” “I havea 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
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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 <file> time
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Introduction 1-9 Chapter 1: roadmap 1.1 What is theInternet? 1.2 Network edge 1.3 Network core 1.4 Network access and physical media 1.5 Internet structureand ISPs 1.6 Delay & loss in packet-switched networks 1.7 Protocol layers, servicemodels 1.8 History
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Introduction 1-10 A closer look at network structure: network edge: applications and hosts network core: routers network of networks access networks, physical media: communication links
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