node



Computernetworknode

Indatacommunication,aphysicalnetworknodecanbeadatacircuitterminationdevice(DCE),suchasamodem,hub,bridgeorswitch;itcanalsobeaDataterminalequipment(DTE),suchasdigitalmobilephones,printersorhosts(suchasrouters,workstations,orservers).

IfthenetworkinquestionisaLANorWAN,eachLANorWANnode(atleastadatalinklayerdevice)musthaveaMACaddress,generallyeachnetworkcardhasone.Examplesincludecomputers,packetswitches,xDSLmodems(withEthernetinterfaces),andwirelessLANaccesspoints.Notethatthehubconstitutesaphysicalnetworknode,butdoesnotconstituteaLANnetworknode.Thisisbecauseanetworkconnectedbyahubislogicallyabusnetwork.Similarly,arepeaterorPSTNmodem(withaserialinterface)isaphysicalnetworknoderatherthanaLANnode.

IfthenetworkinquestionistheInternetoranIntranet,manyphysicalnetworknodesarehosts(thatis,InternetnodesidentifiedbyIPaddresses).Allhostsarephysicalnetworknodes.However,somedatalinklayerdevices,suchasswitches,bridges,andWLANaccesspointsdonothaveIPhostaddresses(exceptforsometimesmanagementpurposes).ThesedevicesarenotconsideredInternetnodesorhosts,buttheyarephysicalnetworknodesandLANnode.

Telecommunicationsnetworknode

Inafixedtelephonenetwork,anodemaybeapublicorprivatetelephoneexchange,remotehuborcomputer,whichprovidessomeintelligentnetworkservices.Incellularcommunications,switchingpointsanddatabases,suchasbasestationcontrollers,homelocationregisters,gatewayGPRSsupportnodes(GGSN),andGPRSservicesupportnodes(SGSN)areallexamplesofnodes.Cellularnetworkbasestationsarenotconsiderednodesinthiscontext.

Inthecabletelevisionsystem(CATV),thistermhasabroadercontext,usuallyrelatedtofiberopticnodes.Thiscanbedefinedasahomeorofficelocationwithinaspecificgeographicareaservedbyapublicfiberopticreceiver.Anopticalfibernodeisusuallydescribedbythenumberof"homepassing"servedbyaspecificopticalfibernode.

NetworkTopology

NetworkTopologyreferstothespecificarrangementofthemembersthatmakeupthenetwork.Dividedintophysical,thatis,real,orlogical,thatis,virtual.Iftheconnectionstructureoftwonetworksisthesame,wesaythattheirnetworktopologyisthesame,althoughtheirinternalphysicalwiringanddistancebetweennodesmaybedifferent.

See

  • Endthesystem

  • Host

  • Networkhardware

  • Terminal

Tento článek je ze sítě, nereprezentuje pozici této stanice. Uveďte prosím původ dotisku
HORNÍ