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The PKI uses the digital certificate to identify an individual or an
organization. The private key is given only to the requesting party and
is never shared, and the public key is made publicly available (as part of
the digital certificate) in a directory that all parties can access. You use
the private key to decrypt text that has been encrypted with your
public key by someone else. The certificates are stored (and, when
necessary, revoked) by directory services and managed by a certificate
management system. See also certificate authority (CA); registration
plenum A compartment or chamber to which one or more air ducts are
plenum-rated cable A type of cable approved by an independent test laboratory for
installation in ducts, plenums, and other air-handling spaces.
PMK Pairwise master key. A code derived from a master secret and used as
an encryption key for IEEE 802.11 encryption algorithms. A PMK is also
used to derive a pairwise transient key (PTK) for IEEE 802.11i robust
security. See also master secret; PTK.
PoE Power over Ethernet. A technology, defined in the developing IEEE
802.3af standard, to deliver DC power over twisted-pair Ethernet data
cables rather than power cords. The electrical current, which enters the
data cable at the power-supply end and comes out at the device end, is
kept separate from the data signal so neither interferes with the other.
policy A formal set of statements that define the way a network’s resources
are allocated among its clients — individual users, departments, host
computers, or applications. Resources are statically or dynamically
allocated by such factors as time of day, client authorization priorities,
and availability of resources.
Policy Manager A 3Com Wireless Switch Manager (3WXM) feature that allows you to
apply a collection of configuration settings known as a domain policy,
or part of the policy, to one or more Wireless Switches (WXs). With
Policy Manager, you can also merge some or all of the configuration
changes you make to a single WX switch into a domain policy. See also
Power over Ethernet See PoE.