20_091012_CE10 - ChEx 10 How the Internet Works MIS 301...

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MIS 301 Introduction to IT Management Lizhen Xu IROM Department McCombs School of Business ChEx 10 How the Internet Works
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Recap Message Alice Bob Encrypted Message Message Bob’s Public Key Bob’s Private Key Decrypt Encryption
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Recap Home in NYC ADSL Hotel in Seattle TV cable Atlanta Office PSDN
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The Internet: An Amazing Miracle
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TCP/IP-OSI Architecture Figure CE7-3
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Network Layers Layer 5 – Applications Write a letter Layer 4 -Transport Mailmen Layer 3 – Internet Central Scheduling Layer 2 – Data link Local Delivery MAC: 00-1E-C9-4D-3E-B7 Layer 1 – Physical Drivers / Pilots
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Layer 5 – Application Layer Applications communicate with other Apps Protocols Simple Mail Transfer Protocol ( SMTP ) Standard e-mail protocol Hypertext Transfer Protocol ( HTTP ) Processes Web pages File Transfer Protocol ( FTP ) Used to copy files from one computer to another
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Layer 4 – Transport Layer Process-to-process delivery (e.g., door-to-door) Transmission Control program ( TCP ) Converts from one data representation to another Breaks e-mail into segments Adds identifying segments to beginning of pieces Provides reliability Checks to see if all packets are received Demo : why we need transport layer?
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Layer 3 – Internet Layer End-to-end delivery (source post office to destination post office) Internet Protocol ( IP ) Interacts with TCP in Layer 4
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20_091012_CE10 - ChEx 10 How the Internet Works MIS 301...

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