* The Internet’s genesis - Defense Department project to create a network that could survive a nuclear conflict * The first users - Government agencies.

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Presentation transcript:

* The Internet’s genesis - Defense Department project to create a network that could survive a nuclear conflict * The first users - Government agencies and universities using the network to share information between computer systems * The Internet is - Network of interconnected Networks supporting millions of connected systems 2

* A World Wide Backbone Network ties Individual Networks into the Internet * The Backbone is built, maintained and managed by Communications Companies, Governments and Universities * Networks in companies, universities, and even our home networks are part of the Internet 3

User’s Home * There are a variety of methods for connecting to the Internet: * Dial-up * Digital Subscriber Lines * Cable Company Services * Dedicated High Speed connections * Home users connect to the Internet via an Internet Service Provider (ISP) Comcast and AT&T are ISPs Cable Modem ISP Internet Backbone 4

* Every device (e.g. computer system, network equipment) has an address on the Internet so that it can be located and communicated with * The addressing scheme of the Internet is defined by the standard called the Internet Protocol (IP) * The format of an IP address is xxx.xxx.xxx.xxx * For example is the address of a device in Google’s network * For ease of reference, IP addresses can be given an alias or Domain Name referred to as a Universal Resource Locator (URL) * For example * Domain names are assigned by authorized agencies * The conversion of a URL ( the domain name part) to an IP address is done by a network application called Domain Name Services 5

* The World Wide Web is the collection of Electronic Documents Web Browser Software that requests and interprets web pages Hypertext Transfer Protocol Protocol for web browser and web server communications Web Server Computer that holds web pages and handles browser requests Web Pages Electronic Documents Internet 6

A variety of applications are supported on the Internet and World Wide Web, including: * Research / Searching * * Conferencing – audio and video * Streaming Media – audio and video * Social Networking * Blogs * Instant Messaging * Electronic Commerce * Business-to-Business * Business-to-Consumer * Inter-computer systems communications The bulk of Internet traffic is business driven 7