Specifications

Glossary-8
domain policy
AcollectionofconfigurationsettingsthatyoucandefineonceinRoamAboutSwitchManagerand
applytomanyRoamAboutSwitches.EachMobilityDomaingroupinthenetworkhasadefault
domainpolicythatappliestoeveryRoamAboutSwitchintheMobilityDomain.SeealsoPolicy
Manager.
DSA
DigitalSignatureAlgorithm.Thepublic‐keyalgorithmusedtosignX.509certificates.
DSSS
Direct‐sequencespread‐spectrum.Oneoftwotypesofspread‐spectrumradiotechnologyusedin
wirelessLAN(WLAN)transmissions.Toincreaseadatasignal’sresistancetointerference,the
signalatthesendingstationiscombinedwithahigher‐ratebitsequencethatspreadstheuserdata
infrequencybyafactor
equaltothespreadingratio.CompareFHSS.
DTIM
Deliverytrafficindicationmap.Aspecialtypeoftrafficindicationmap(TIM)elementinabeacon
framethatoccursonlywhenastationinabasicserviceset(BSS)isinpower‐savemode.ADTIM
indicatesthatanybufferedbroadcastormulticastframesareimmediatelytransmittedbyanAccess
Point
(AP).
DXF format
Ataggeddatarepresentation,inASCIIformat,oftheinformationcontainedinanAutoCAD
drawingfile.
dual-homed connection
Aredundant,resilientconnectionbetweenanAccessPoint(RBT‐1602)andoneormore
RoamAboutswitches.TheconnectioncanconsistoftwodirectphysicallinksfrombothAPports
tooneortwoRoamAboutswitches,oneormoredistributedlinksthroughanintermediateLayer2
orLayer3network,ora
combinationofonedirectphysicallinkandoneormoredistri butedlinks.
TheAPusesonelinkforbooting,configuration,anddatatransferandusestheotherlink(s)as
backupsincasetheactivelinkfails.If theAPhastwodirectphysicallinkstooneormore
RoamAboutswitches,
thePoweroverEthernet(PoE)loadissharedacrossbothlinks.If theactive
datalinkfails,theotherlinkprovidesuninterruptedpowertotheaccesspoint.
Afterchangingitsactivelink,theaccesspointrebootsandloadsnewconfigurationinformationto
ensureproperconfigurationandsecurity.MobilityDomainservicesare
temporarilydisruptedby
thelinkchange.Dual‐homedconnectionsarenotrequiredbutarerecommended.Seealsobias.
Dynamic Host Configuration Protocol
SeeDHCP.
EAP
ExtensibleAuthenticationProtocol.Ageneralpoint‐to‐pointprotocolthatsupportsmultiple
authenticationmechanisms.DefinedinRFC 2284,EAPhasbeenadoptedbyIEEE802.1Xinan
encapsulatedformforcarryingauthenticationmessagesinastandardmessageexchangebetween
auser(client)andanauthenticator.TheencapsulatedEAP,alsoknownasEAP
overLAN(EAPoL)
andEAPoverWireless(EAPoW),enablestheauthenticator’sservertoauthenticatetheclientwithan
authenticationprotocolagreeduponbybothparties.SeealsoEAPtype.