7. GLOSSARY AND ACRONYMS
in case the main router fails. (This can be used
to provide a wireless cellular backup to a primary
wired router in critical applications).
WAN
A wide area network (WAN) is a network
that covers a broad area (i.e., any telecommu-
nications network that links across metropolitan,
regional, or national boundaries) using private or
public network transports. Business and govern-
ment entities utilize WANs to relay data among
employees, clients, buyers, and suppliers from
various geographical locations. In essence, this
mode of telecommunication allows a business
to effectively carry out its daily function regard-
less of location. The Internet can be considered
a WAN as well, and is used by businesses, gov-
ernments, organizations, and individuals for al-
most any purpose imaginable.
X.509
In cryptography, X.509 is an ITU-T
standard for a public key infrastructure (PKI)
and Privilege Management Infrastructure (PMI).
X.509 specifies, amongst other things, standard
formats for public key certificates, certificate re-
vocation lists, attribute certificates, and a certifi-
cation path validation algorithm.
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