Specifications

Glossary-11
forwarding database (FDB)
Adatabasemaintained onaRoamAboutSwitchforthe purposeofmakingLayer 2forwardingand
filteringdecisions.Eachentryconsistsofthemediaaccesscontrol(MAC)addressofasourceor
destinationdevice,anidentifierfortheportonwhichthesourceordestinationstationislocated,
andanidentifierfor
thevirtualLAN(VLAN)towhichthedevicebelongs.FDBentriesareeither
permanent(neverdeleted),static(notaged,butdeletedwhentheRoamAboutSwitchisrestarted
orlosespower),ordynamic(learneddynamicallyandremovedthroughagingorwhenthe
RoamAboutSwitchisrestartedorlosespower).
Frequency-Hopping Spread-Spectrum
SeeFHSS.
GBIC
Gigabitinterfaceconverter.Ahot‐swappableinput/outputdevicethatplugsintoagigabitEthernet
port,tolinktheportwithafiber‐opticorcoppernetwork.Thedatatransferrateis1gigabitper
second(Gbps)ormore.Typicallyemployedashigh‐speedinterfaces,GBICsallowyoutoeasily
configureandupgrade
communicationsnetworks.
Gigabit Interface Converter
SeeGBIC.
glob
SeeMACaddressglob;userglob;VLANglob.
GMK
Groupmasterkey.Acryptographickeyusedtoderiveagrouptransientkey(GTK)forthe
TemporalKeyIntegrityProtocol(TKIP)andAdvancedEncryptionStandard(AES).
greenfield network
Anoriginaldeploymentofatelecommunicationsnetwork.
GRE tunnel
Avirtuallinkbetweentworemotepointsonanetwork,createdbymeansoftheGenericRouting
Encapsulation(GRE)tunnelingprotocol.GREencapsulatespacketswithinatransportprotocol
supportedbythenetwork.
GTK
Grouptransientkey.Acryptographickeyusedtoencryptbroadcastandmulticastpacketsfor
transmissionsusingtheTemporalKeyIntegrityProtocol(TKIP)andAdvancedEncryption
Standard(AES).
Group Master Key
SeeGMK.
Group Transient Key
SeeGTK.
H.323
AsetofInternationalTelecommunicationsUnionTelecommunicationStandardizationSector
(ITU‐T)standardsthatdefineaframeworkforthetransmissionofreal‐timevoicesignalsoverIP
packet‐switchednetworks.