Network Router User Manual

79
Keys
Keysareusedlikepasswordstoopenandclose(encryptanddecrypt)messages.Whilemany
encryptionalgorithmsarecommonlyknownandpublic,thekeymustbekeptsecret.
Local‐AreaNetwork(LAN)
Asmalldatanetworkcoveringalimitedarea,suchasabuildingorgroupofbuildings.MostLANs
connectworkstationsorpersonalcomputers.Thisallowsmanyuserstosharedevices,suchas
printers,aswellasdata.TheLANalsoallowseasycommunication,byfacilitatinge‐mailor
supportingchatsessions.
MediaAccessControl(MAC)Address
Theaddressassociatedwitheveryhardwaredeviceonthenetwork.Every802.11wirelessdevice
hasitsownspecificMACaddresshard‐codedintoit.Thisuniqueidentifiercanbeusedtoprovide
securityforWLANs.WhenanetworkusesaMACtable,onlythe802.11radiosthathavehad
theirMACaddressesaddedtothatnetwork'sMACtableareabletogetontothenetwork.
NetworkAddressTranslation(NAT)
AnInternetstandardthatenablesaLANtouseonesetofIPaddressesforinternaltrafficanda
secondsetofaddressesforexternaltraffic.
NetworkTimeProtocol(NTP)
Aprotocolthatallowsdevicestosynchronizetheirtimewithatimeserver.ItusesTCPorUDP
port123bydefault
P assphrase
AtextstringusedtoautomaticallygenerateWEPkeysonwirelessclientadapters.
PowerOverEthernet(PoE)
Theability toprovidepowertoaPoE‐enableddeviceviaan8‐pinCAT5Ethernetcable,
eliminatingtheneedforanearbypowersource.
Preamble
UsedtosynchronizetransmissionsinaWLAN.ThepreambletypedefinesthelengthoftheCyclic
RedundancyCheckblockforcommunicationbetweenthedeviceandroamingwirelessstations.
ProtectedExtensibleAuthenticationProtocol(PEAP)
AnauthenticationprotocolofIEEE802.1xusedtotransmitauthenticationdata,including
passw ords,over802.11WLANs.
QualityofService(QoS)
Referstoanetwork’sabilitytodeliverdatawithminimumdelay,andtothenetworkingmethods
usedtoprovidebandwidthforreal‐timemultimediaapplications.
RemoteAuthenticationDial‐InUserService(RADIUS)
Anetworkingpr otocolthatprovidescentralizedauthentication,authorization,andaccounting
managementforcomputerstoconnectanduseanetworkservice.Becauseofthebroadsupport
andtheubiquitousnatureoftheRADIUSprotocol,itisoftenusedbyISPsandenterprisesto
manageaccesstotheInternetorinternalnetworks,WLANs,andintegratede‐mailservices.
ServiceSetIdentifier(SSID)
ThenameofaWLAN.AllwirelessdevicesonaWLANmustusethesameSSIDinorderto