Re: what is the different between "intranet" and "LAN"?

From: Floyd L. Davidson (floyd_at_barrow.com)
Date: 03/13/04 

Date: Sat, 13 Mar 2004 01:35:59 -0900

i141802596@yahoo.com (nick) wrote:
>thanks!

A Local Area Network (LAN) is a single network connected by
physical cabling that is essentially one unit of hardware.
Hence, each host on that network is wired to every other host on
that network in some way. Today that usually means a form of
ethernet, but in fact there are many different types.

A Wide Area Network (WAN) is created by somehow bridging two or
more of these LANs together to act more or less as one. A WAN
however is usually a way to connect _similar_ LANs together to
form what functions as one big LAN.

The concept of an "Internet Protocol" was developed because
there are so many different types of LANs. DECnet, token ring,
ethernet, Applenet, and others. The Internet Protocol (IP)
provides inter-connection between any or all of these various
LANs.

Hence /The Internet/ came into being, and everybody from
everywhere (and their two little sisters) are connected to it.
A variety of services have been designed to function over The
Internet. However, those services are sometimes the best way to
provide services not just to the entire world on The Internet,
but also to a smaller, retricted, group. Hence using IP on a
private network (or group of networks) came to be called an
"Intranet".

Generally speaking Intranet amounts to IP services provided
within an organization's private network, while Internet refers
to IP services which extent outside the confines of the company.

For example, today almost all large companies have an internal
Intranet, with web pages, file sharing, ftp, mail servers,
etc. etc., that only employees using host computers connected to
the company network are able to access. For security reasons
these Intranets do not share physical or logical com links with
the Internet in most cases, or at least not from a customer
point of view. They may in fact, however, share things like
Frame Relay links (i.e., be assigned to virtual circuits within
a major carrier's "frame relay cloud"). What that boils down to
is companies will not trust ISPs, but do trust major telecom
providers. 

--
Floyd L. Davidson           <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska)                         floyd@barrow.com

Relevant Pages

  • Re: 2 pc network - cant see host files from pc 2 on pc 1
    ... If the second card is lost on HOST PC then DSL Internet does not connect. ... Ditch the second network card in the one ...
    (microsoft.public.windowsxp.security_admin)
  • Re: Conflict between www. & mail.
    ... mail.ilpomodoro.com is hosted at Network Solutions ... and fussed with the A record, host record, etc but it's still not ... Network Solutions email server also responded. ... ns29.worldnic.com internet address = 205.178.190.15 ...
    (microsoft.public.win2000.dns)
  • Re: Yoo-hoo, I still dont have an answer! (was Re: Sygate)
    ... Acronym for Internet Protocol. ... packets from sender to destination network and station, ... the network the host is connected to; the remaining bits identify the host ...
    (alt.computer.security)
  • Re: USB ASDL Network
    ... >i have a home network and my modem is connected by USB to ... Assuming that you're running XP on both computers, ICS on the host should work ... fine for internet service on the other computer. ...
    (microsoft.public.windowsxp.network_web)
  • How do I configure my wireless PC to share its internet connex w/
    ... Basically its a long way from my PS2 ... I assume I should be able to harness the internet ... I should be able to start a network. ... Setup Wizard to configure the laptop to serve as a network Host to ...
    (microsoft.public.windowsxp.network_web)
Loading