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COMS 161 Introduction to Computing

Learn about internet protocols, network layers, TCP/IP, the World Wide Web, client/server architecture, URLs, web browsers, HTML, and HTTP in this introductory lecture.

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COMS 161 Introduction to Computing

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  1. COMS 161Introduction to Computing Title: Internet Date: October 8, 2004 Lecture Number: 19

  2. Announcements • Material • chapter 18 (The Internet) • Chapter 5 (Creating Documents) pp 92 • Homework 6 • Due (Friday) 10/15/2004

  3. Review • Internet protocols • Network layers • TCP/IP

  4. Outline • Internet Protocols • World Wide Web • Client/Server • URL • Web Browser • HTML and HTTP

  5. How the Internet Works • DATAGRAM • A TCP packets • IP address • a number that signifies the address of an Internet host • Domain names are pseudonyms for IP addresses • Domain name servers provide • IP numbers for URLs • e-mail addresses

  6. How the Internet Works • Gateways and Routers transmit datagrams across the Internet • Client/Server applications add functionality to the Internet

  7. How the Internet Works • IP (Internet Protocol) packet address • Each internet host has a unique IP address • Each address is composed of four sets of numbers separated by periods (dots) • 123.23.168.22 • TCP and UDP (user datagram protocol) • how messages are delivered • TCP -- guaranteed service (e-mail, HTTP, etc.) • UDP -- normal service (PING, DNS, etc.)

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