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what is the difference between intranet, internet, and the extranet?

aft
aft asked
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Last Modified: 2008-03-10
what is the difference between intranet, internet, and the extranet?
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David WilliamsChief Information Officer
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Commented:
The Internet is what we all know as 'the Internet' ... that is, a single, global, super-network, which in many senses is a 'network of networks' ... that is, many campuses and large organisations all with their own internal networks, which have been fused in to 'the Internet'.
  An Intranet is an internal system (typically, a Web server) that a company or campus or other organisation uses for internal dissemination of information, and software deployment.
  The Extranet is simply 'the outside world', if your company has an Intranet installed.  That is, 'the rest' of the Internet, that has been excluded by the Intranet.

Commented:
rejected ???

davids awnswer is correct what else did you want to know?

barry
David WilliamsChief Information Officer
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Commented:
How come you rejected my answer?  Can you give some sort of comment?  Was there something else you wanted to know?
David's answer was correct.. Why did you reject it?
Later

Commented:
Here is a less technical answer . . .

INTRAnet - when you have several computers using ONE MAIN COMPUTER (aka server) we say that's an INTRAnet.  This setup DOES NOT allow you to access any one OUTSIDE of your little "LOOP".  In other words, IF THE INFO IS NOT ON THE HARD DRIVE OF THE MAIN COMPUTER, and the other guys that are linked to the main computer don't have it. . . .YOU AINT GONNA GET IT !!!  Buisness use INTRAnet to share and pass information where OTHERS outside of the company will NOT ever have access to it.  That's why we can't see BILL GATES having a video conference with his employees right now. . .he wouldn't broadcast the meeting to THE WORLD . . .just his employees.  The INTRAnet's "main" computer (aka company server) is NOT linked to any OUTSIDE machine.  The INTRAnet setup is also called a "NETWORK"

INTERnet - is the same as INTRAnet exept the MAIN computer is LINKED to OTHER MAIN computers.  Buisnesses that provide us with links to their MAIN computers which are linked to OTHER MAIN computers around the world are called INTERNET SERVICE PROVIDERS (or ISP for short).  Sincer the ISPs computer is linked to other ISPs computers, you get access to 1000s of MAIN computers throughout the world !!!  The INTERnet enables us to share this Q & A right now !!  What is happening here is I am accessing the MAIN computer that this site is on and SAVING (or posting) the answer onto the hard drive of that MAIN computer.  YOU are able to access it because YOUR ISPs computer is linked can link to it whenever you type the URL or internet address (works much like a phone call to the hard drive !).

EXTRAnet - is ANYTHING that cant be thown into the two catagories above !!
aft

Author

Commented:
i want to know with a complete details what is difference between the internet, intranet, and the extranet
how softwares can i use to setup my organization to use the intranet and is it possible for every one on the intranet to publish what he want on the intranet through his computer or that can be done only on the main computer(aka server)

Commented:
.....and the meaning of life
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Commented:
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aft

Author

Commented:
after i installed the microsoft webserver and every one has its directory on a dedicated server and his directory have its own home page what can a certain people see the home page of another one through his internet explorer?
aft

Author

Commented:
and are all computers must have the same operating system?
aft

Author

Commented:
after i configured my intranet it is possible for any one to enter to my LAN by write the IP address of my server or any client is his internet explorer?
and if that is there is a way to eliminate that?

David WilliamsChief Information Officer
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Commented:
 If you install the Microsoft webserver on a dedicated server then it doesn't matter what browser or operating system the client PC's are using.  However, they should be Windows 95/98/NT if you wish to allow people to modify pages by shares.  However, again, you could set up an ftp server on your NT server, and allow people to use ftp to upload pages - then the OS they use is not important at all.
  Even though people have a dedicated directory, anyone can still view their Web page - they just can't modify it.
  People can't enter your LAN if you aren't connected to the Internet, or you have a dynamic IP address.  And you could configure your server to reject connections from machines outside your domain, also.
aft

Author

Commented:
can i setup microsoft webserver on windows 95 computer?
if no. then why?
David WilliamsChief Information Officer
CERTIFIED EXPERT

Commented:
 You can install the Personal Web Server, but I'm not sure about Internet Information Server.  Check www.microsoft.com/iis to see if there are any clues there.
  Windows 95 doesn't support a lot of the server-type functionality that comes with NT Server, or background services, and so forth, so if not, these might be the reasons.
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