Specifications

Glossary-19
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RoamAboutSwitchManager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RoamAboutSwitches.With
PolicyManager,youcanalsomergesomeoralloftheconfigurationchangesyoumaketoasingle
RoamAboutSwitchintoadomainpolicy.Seealsodomainpolicy.
Port Address Translation
SeePAT.
Power over Ethernet
SeePoE.
pre-master secret
AkeygeneratedduringthehandshakeprocessinTransportLayerSecurity(TLS)protocol
negotiationsandusedtoderiveamastersecret.
PreShared Key
SeePSK.
PRF
Pseudorandomfunction.Afunctionthatproduceseffectivelyunpredictableoutput.APRFcanuse
multipleiterationsofoneormorehashalgorithmstoachieveitsoutput.TheTransportLayer
Security(TLS)protocoldefinesaspecificPRFforderivingkeyingmaterial.
Privacy-Enhanced Mail
SeePEM.
private key
Incryptography,oneofapairofkeys,onepublicandoneprivate,thatarecreatedwiththesame
algorithmforencryptinganddecryptingmessagesanddigitalsignatu r es. Theprivatekeyis
providedtoonlytherequestorandnevershared.Therequestorusestheprivatekeytodecrypttext
thathas
beenencryptedwiththepublickeybysomeoneelse.SeealsoPKI;publickey.
PRNG
Pseudorandomnumbergenerator.Analgorithmofpredictablebehaviorthatgeneratesasequ ence 
ofnumberswithlittleornodiscernibleorder,exceptforbroadstatisticalpatterns.
Protected Extensible Authentication Protocol
SeePEAP.