What is the Internet
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What is the Internet and How does it work?. Birth of the Internet. Data at military sites easily isolated. Every site linked to every other site through multiple connections. Super Interstate Highways in the 1950’s linked major cities across the USA. US response to threat of “cold war”.

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What is the Internet

and

How does it work?


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Birth of the Internet

Data at military sites easily isolated

Every site linked to every other site through multiple connections

Super Interstate Highways in the 1950’s linked major cities across the USA

US response to threat of “cold war”



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the INTERNET

The INTERnet links many thousands of networks and computers together to share information.

Local ISP

Internet Service Provider

Anyone can access it.Anyone can add to it.


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INTRAnet? - INTERnet?

INTRAnet - internal - inside a network

www

FILESERVER

Users MUST be inside the network to access it


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INTRAnet? - INTERnet?

INTRANET

• internal

• access limited to those INSIDE the network

• users may read and write to the fileserver

• users may access the internet

INTERNET

• world wide

• access available to anyone and everyone

• users may read, write and download from the internet


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The Directory - the section on the domain that contains the document requested

The protocol - tells the computer what kind of request it is.

The file -the actual name of the file requested

The domain name - tells the computer where to send the request.

IP: 203.147.209.80

so ….. how does it work?

URL - Universal Resource Locator

http://www.cap.nsw.edu.au/teachers/lesson_plans.html

If no directory or file is requested the web server will usually send a preset default or “home” page

http://www.cap.nsw.edu.au

will deliver CAP’s home page


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Netscape Navigator or Communicator

Microsoft Explorer

Web Browsers


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