A SERVICE OF

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Glossary of Terms
Chapter 4 61
initiated by the client or a compulsory tunnel initiated
during authentication by a server or other dedicated
network equipment.
Users
Individuals whom the AAA server must authenticate
and authorize before by they can access an
organization’s service, such as Internet access through
an ISP.
VPN
See Virtual Private Network.
Virtual Private Network
A network service offered by public carriers in which
the user is provided a network that in many ways
appears as if it is a private network (user-unique
addressing, network management capabilities,
dynamic reconfiguration, etc.) but which, in fact, is
provided over the carrier's public network facilities,
abbreviated as VPN.