Lecture 2- Interent and WWW

Lecture 2- Interent and WWW - Chapter 2 Internet and World...

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Unformatted text preview: Chapter 2 Internet and World Wide Web www.cartoonstock.com/.../mfl/lowres/mfln314l.jpg INTERNET! A network of networks • Public accessible • International • Composed of L ocal A rea N etworks and W ide A rea N etworks • Connects millions of computers together worldwide Foreign networks Domestic networks academics government Personal use INTERNET! commercial So, isn’t the Web and the Internet the same thing?? Actually, not at all! • The Internet shares/carries information from one network to another … and enables these services… – Electronic email – On-line chatting – File transferring – Search engines – And the World Wide Web !—which is a collection of interlocked web pages. So, isn’t the Web and the Internet the same thing?? • The Internet provides the network architecture to enable WWW communicating • Computer users access information on the web over the medium of the Internet • The information-sharing web is “built” on top of the Internet! Internet Protocols • Established procedures of conduct • Internet protocols are rules that help in governing an operation on the internet and communications over it. TCP/I P TCP-routing packets; IP-correct delivery of packets SMT P Email protocols for Sending Emails POP3 & IMAP Email protocols For retrievin g emails HTTP & HTTP S Web page protocols DNS “translator” server So, how does the Internet work? server client A client ( a personal computer ) connects with a server ( shared computer ) permitting messages to be shared . Before we talk Protocols , what’s a Client and Server ? What's a server? A server is a computer ( or software package ) in a network that is used to provide particular services to other computers. Here are some examples: A mail server routes email and handles outgoing email. A file server , also called a web server , holds your web pages, and makes them available to your viewers. Protocol: TCP/IP TCP/IP is most fundamental protocol to the working of the Internet. TCP ( T ransmission C ontrol P rotocol) How packets are routed-- TCP enables two hosts to establish a connection and exchange streams of data. IP ( I nternet P rotocol) Ensures correct delivery of packets from client to server TCP/I P TCP-routing packets; IP-correct delivery of packets Protocol: TCP/IP TCP/IP is most fundamental to the working of the Internet....
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Lecture 2- Interent and WWW - Chapter 2 Internet and World...

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