Public and private networks:
Public networks are those that comply with regional government regulations,
and protocol standards. These are normally open to Corporates and general public
for use. One example of a public network is the Telcos that operate telephone
network. Another example of public data network is the Internet.
Private networks are normally limited to a compound. Several Corporates
implement private networks using public networks. Technologies like leased
lines, and virtual private networks enable implementation of private wide
area networks (private WANs).
Public IP networks should use valid IP address range, whereas private
networks may use private/public ip address range. By using a public address
range, a Company may seamlessly integrate the Corporate network with
public network. However, by using private address range, it is possible to
integrate with public network by using proxy servers. A proxy server translates
IP addresses according to a given set of rules.