public vs private data network

public vs private data network

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Subject Author Date
public vs private data network jonnah 04-11-2005
Posted by jonnah on April 11, 2005, 2:21 am
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hi all,

what is the difference between public and a private data network? am I
correct in assuming that if you use a *public* data network to connect
your remote offices with your branch offices, you either use the
Internet as the Public DN or frame relay (as the Public DN of a telco)
but if you use leased lines or pt to pt links, then is it considered
as a *private* data network? (since you're not sharing the links with
others) if anybody knows, please enlighten me

thanks!


Pure Networks
Posted by Brian on April 11, 2005, 7:07 am
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Private vs Public refers to the IP addressing scheme. You can use
either globally routed IP's (public) or private IP's
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix).
See RFC 1918 for more details.
http://www.faqs.org/rfcs/rfc1918.html



Posted by Walter Roberson on April 12, 2005, 4:37 am
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:what is the difference between public and a private data network? am I
:correct in assuming that if you use a *public* data network to connect
:your remote offices with your branch offices, you either use the
:Internet as the Public DN or frame relay (as the Public DN of a telco)
:but if you use leased lines or pt to pt links, then is it considered
:as a *private* data network? (since you're not sharing the links with
:others) if anybody knows, please enlighten me

Pretty much. If a random person around the world can get packets
to your security gate then you are on a public data network.
If only a closed list of places can get to your security gate,
and you can't get out either then you are on a private data network.

In between would be semi-private networks that have clouds
of accessible devices and security gateways to public networks.
For example, a research network might allow public email in
and might allow insiders a wide variety of outward accesses,
but the basic security controls might be far away from
most of the member systems.

To really be considered a private network in the traditional
PSTN sense, there can't be -any- cross-border traffic possible
through the network facilities.
--
'ignorandus (Latin): "deserving not to be known"'
-- Journal of Self-Referentialism


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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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