Specifications

Glossary-5
CCMP
Counter‐ModewithCipherBlockChainingMessageAuthenticationCodeProtocol.Awireless
encryptionprotocolbasedontheAdvancedEncryptionStandard(AES)anddefinedintheIEEE
802.11ispecification.CCMPusesasymmetrickeyblockciphermodethatprovidesprivacyby
meansofcountermodeanddataoriginauthenticitybymeansof
cipherblockchainingmessage
authenticationcode(CBC‐MAC).Seealso802.11i;AES;TKIP;WPA.Compare WEP.
cell
Thegeographicalareacoveredbyawirelesstransmitter.
Certificate Authority (CA)
Networksoft warethatissuesandmanagessecuritycredentialsandpublickeysforauthentication
andmessageencryption.Aspartofapublic‐keyinfrastructure(PKI),whichenablessecure
exchangesofinformationoveranetwork,acertificateauthoritycheckswitharegistration
authority(RA)toverifyinformationprovidedbytherequestorofa
digitalcertificate.Ifthe
registrationauthorityverifiestherequestor’sinformation,thecertificateauthoritycanissuea
certificate.BasedonthePKIimplementation,thecertificatecontentcanincludethecertificate’s
expirationdate,theowner’spublickey,theowner’sname,andotherinformationabout thepublic‐
keyowner.SeealsoRegistrationAuthority
(RA).
Certificate Signing Request
SeeCSR.
Challenge Handshake Authentication Protocol
SeeCHAP.
CHAP
ChallengeHandshakeAuthenticationProtocol.Anauthenticationprotocolthatdefinesa
three‐wayhandshaketoauthenticateauser(client).CHAPusestheMD5hashalgorithmto
generatearesponsetoachallengethatcanbecheckedbythe a uthenti cator. Forwireless
connections,CHAPisnotsecureandmustbeprotectedbythe
cryptographyinsuchauthentication
methodsastheProtectedExtensibleAuthenticationProtocol(PEAP)andTunneledTransport
LayerSecurity(TTLS).
client
Therequestingprogramordeviceinaclient‐serverrelationship.InawirelessLAN(WLAN),the
client(orsupplicant)requestsaccesstotheservicesprovidedbytheauthenticator. Seealso
supplicant.
Co-Channel Interference
SeeCCI.
collision domain
Asinglehalf‐duplexIEEE802.3CarrierSenseMultipleAccesswithCollisionDetection(CSMA‐
CD)network.AcollisionoccurswhentwoormoreLayer 2devicesinthenetworktransmitatthe
sametime.EthernetsegmentsseparatedbyaLayer 2switcharewithindifferentcollisiondomains.
Comma-Separated Values File
SeeCSVfile.
Communications Plenum Cable
Seeplenum‐ratedcable.