Transcript
  • 5/25/2018 6745175 Network Protocols

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    NETWORK

    DATALINK

    PHYSICAL

    TRANSPORT

    SESSION

    PRESENTATION

    APPLICATION

    3

    45

    7

    6

    Internetwork

    Ethertype

    LLC 802.2

    V,E,T Series

    ISDN HDLCFrame RelayWAN ATMLAN CDPD

    LinkControlProtocol

    SLIP

    Lucent Wireless

    3.5G Mobile IP

    UMTS/GSMWIRELESS

    GPRS

    Motorola Wireless

    3G UMTS W-CDMA

    2.5G WAP Forum

    SS7OverIP

    CC

    MM

    GMM

    SM

    NAS

    TCAP

    BMC

    PDCP

    AAL2L3

    ALCAP

    NBAP

    RANAP

    RNSAP STC

    FromIP

    F r om T C P F r om T C P

    FromUDPvv FromNetBEUI

    FromTCP

    FromUDP

    FromUDP

    ToEthernet

    From NSP

    FromUDP

    FromUNI

    To MPTN

    To SMB

    To ISO TP

    To DLSw

    To SMB

    ToXTP To VFRP

    To ND To IS O T P

    FromX.25

    FromPPP

    FromSLIP CSLIP

    To PPP

    From SMDS

    To FrameRelay

    To LAPB To Frame Relay

    ToDS1

    ToToken Ring

    ToSNATo

    SNAXID

    ToSNANLP

    From UDP

    FromFrameRelay

    From UDP FromX.25

    To SLIPTo PPP To PPP

    From IP

    FromTCPFromFrameRelay From Frame Relay

    FromNetBIOS (Novell)

    FromNetBIOS (3Com)

    FromNetBIOS-DGM

    FromNetBIOS (ISO)

    FromVSPP

    FromSPP

    FromNSP

    FromIP

    FromSPX,SPXII

    To RI

    To IP

    To PPP

    To SMB

    To SMB

    To MDLP

    From ISO DE

    FromCLNP

    From X.400

    To IPTo TCP

    ToTCPComp

    To CLNP

    FromISOTP

    ToX.25

    ToEthernet

    To FDDI

    To Ethernet

    To TokenRing

    To DRP

    To DDP

    From LAPB

    FromLAPB

    To QLLC

    To PPP

    To IP

    To SNMP

    FromX.25

    FromSDLC

    To FTP,Telnet...

    FromFDDI

    FromEthernet

    FromTokenRing

    FromUDP

    FromLAPD

    FromTCP

    FromUDP

    FromIP

    FromTCP

    FromTP4

    FromX.25

    FromSNA FromUDP

    FromTCP

    FromIP

    FromPPP

    FromLAPD

    FromPPP

    FromTCP

    FromPPP

    FromPPP

    FromTCP

    FromUDP

    FromTCP

    FileTransfer

    Protocol RemoteUnixPrint(Ipr)

    SimpleMail

    TransferProtocol

    NetworkNewsTransfer

    FileRetrievelInternetRelayChat

    Telnet

    TagDistributionProtocol

    PostOffice

    Protocolv3HyperText

    TransferProtocol

    RemoteUnixShell

    RemoteUnix

    GeneralInter-ORBProtocol

    CORBAInternet

    Inter-ORBProtocol

    RemoteUnixLogin

    AccessControl

    Protocol

    InternetManagement

    SimpleNetwork

    ManagementProtocol

    CMIPoverTCP

    SimpleNetwork

    ManagementProtocol

    DispatchingforSNMP

    SimpleNetworkManagement

    Protocol

    RealTimeStreamingProtocol

    Re m ot e U n ixE xe c Re m o te U n ixWHOProtocol

    AccessControlProtocol

    NetworkInformation

    ServicesRemoteStatistics

    Ne t wo rkFi le Syst em Po rt M ap p e r DynamicHostConfiguration

    Protocol

    NetworkTimeProtocol

    BootstrapProtocol

    MountServer

    SunNetworkDisk

    SeverMessageBlock

    ManagementServices

    SNATransactionsServices

    FileServices

    DocumentInterchangeArchitecture

    DistributedServices

    DistributedDataManagement

    DocumentControlArchitecture

    NetWareWatchdogProtocol

    NetWareBroadcast

    MessageNotification

    NetWareLite

    NetWareLiteProtocol

    NetWareLiteSidebandProtocol

    NetWare

    DirectoryService

    IPXDiagnosticSupportProtocol

    NovellSerializationProtocol

    NetWareCoreProtocol

    ServiceAdvertising

    Protocol

    (X.29)PacketAssemblyDisassembly

    DirectoryServices

    CommonManagementInformation

    Protocol

    FileTransfer,

    Access&Management

    VirtualTerminalProtocol

    CommonManagementInformation

    ServiceElement

    ElectronicMailOfficeDocument

    Architecture

    Manufacturing

    MessagingService

    AssociationControlServiceElement

    RemoteOperationsServiceElement

    ReliableTransferServiceElement

    AppleTalkFilingProtocol

    MobileNetworkLocationProtocol

    AccountingServicesProtocol

    RadioResourceManagement

    Subnetwork-DependentConvergenceProtocol

    MobileNetwork

    RegistrationProtocol

    MobileDataLink

    Protocol

    CellularDigitalPacketDateMediumAccessControl

    1.544Mbps2.048Mbps34Mbps45MbpsHighSpeedSerial

    Interface

    ModemStandards

    2 40 0b ps 2 40 0b ps2400bps9600bps

    14.4bps9600bps9600bps4800bps

    AT&T103300bps

    AT&T2121200bps

    High-LevelData-LinkControl

    LinkAccessProcedureBalanced

    LocalTalkLink

    AccessProcedure

    AppleTalkAddressResolutionProtocol

    DatagramDeliveryProtocol

    RoutingTable

    MaintenanceProtocol

    AppleTalkUpdateRoutingProtocol

    Routing

    (AppleTalk)NameBindingProtocol

    AppleTalkEchoProtocol

    AppleTalkDataStreamProtocol

    KiewitStreamProtocol

    ZoneInformationProtocol

    AppleTalkSessionProtocol

    PrinterAccessProtocol

    AppleTalkTransaction

    Protocol

    Transport

    ProtocolClass4

    Transport

    ProtocolClass3

    PresentationProtocol

    SessionProtocol

    (ISO)

    ISOTransport

    Transport

    ProtocolClass2

    Transport

    ProtocolClass1

    Transport

    ProtocolClass0

    SequencedPacketExchange

    SequencedPacketExchange

    (Novell)

    LogicalUnit6.2

    PresentationServices

    IBMNetworkManagement

    SNACharacterStream

    IntelligentPrinterDataStream

    RemoteAuthenticationDialInUserService

    Layer2TunnelingProtocol

    InternetIP-Security DifferentiatedServices

    Layer2ForwardingProtocol

    (H.225)Registration,Admission,

    Status

    RealTimeProtocol

    RealTimeControlProtocol

    (H.225)CallSetup

    MediaGateway

    CentralProtocol

    SimpleGatewayControlProtocol

    CallSupplementServices

    FramingProtocol

    MediumAccessControl

    IuInterface

    UserPlane

    GPRSTunnelingProtocol

    MobileIP

    3COM3rdGenerationProtocol

    ReliableLinkProtocol

    WirelessICMP

    WirelessDatagramProtocol

    WirelessTransaction

    WirelessSession

    OvertheAir

    CallControl

    NonAccess

    Station

    Mobility

    Management

    GPRSMobility

    Management

    SessionManagement

    ServiceIndication

    Service

    LoadUserAgent

    Profile

    RADIOLinkProtocol

    ChannelElementSpeechHandler

    Motorola

    PropertyMotorola

    Property

    ReliableLinkControl

    SessionInitiationProtocol

    CallControlRemoteProcedureCall

    LightweightPresentationProtocol

    LightweightDirectionAccessProtocol

    AccessLinkControlApplication

    DomainNameServer

    (TCP/IP)NameServer

    Node-BApplication

    Broadcast/MulticastControl

    PacketData

    ConvergenceProtocol

    RadioResourceControl

    RadioAccessNetworkApplication

    Part

    RadioNetworkSubsystem

    AppliationPart

    Signaling

    TansportCovertor

    (TCP/IP)SessionProtocol

    ISODevelopmentEnvironment

    BorderGatewayProtocol

    LabelDistributionProtocolofMPLS

    MulticastSourceDiscoveryProtocol

    R e li a bl e UD P M e di a G at e wa yControlProtocol

    CiscoGatewayDiscoveryProtocol

    SimpleGateway

    ControlProtocol

    ExtendedGateway

    ControlProtocol

    Multi-protocol

    BGP

    PointtoPoint

    TunnelingProtocol

    HotStandbyRouter

    CiscoSerialTunnelingofSDLCheader

    RemoteSourceRouteBridgingProtocol

    CiscoX.25overTCP

    (TCP/IP)DatagramProtocol

    CompressedTransport

    ControlProtocol

    TransportControlProtocol

    UserDatagramProtocol

    RoutingProtocols

    RoutingProtocols

    CiscoProperties

    CiscoProperties

    OpenShortestPathFirstProtocol

    InternetGroupManagementProtocol

    DistanceVectorMulticastRouting

    Protocol

    ProtocolIndependentMulticast

    DenseMode

    ProtocolIndependentMulticast

    SparseMode

    M u ltic a st OSPF Virtu a lRo ut e r

    RedundancyProtocol

    IPwithinIP

    ResourceReservationProtocol

    CiscoEnhancedIGRP InternetGatewayRoutingProtocol

    InternetGatewayRoutingProtocol

    RemoteSourceRouteBridging

    Protocol

    GatewaytoGatewayProtocol

    GenericRoutingEncapsulation

    (TCP/IP)RoutingInformationProtocol

    ExteriorGatewayProtocol

    InternetControl

    MessageProtocol

    InternetProtocol

    BerkeleyTrailers

    Encapsulation

    Internet

    Protocol

    RoutingInformation

    ProtocolSimpleControl

    TransmissionProtocol

    MessageTransferPartLevel3

    SignalingConnection

    ControlPart

    SCCPManagement

    ISDNSignaling

    UserPart

    OpenShortestPathFirst

    InternetControlMessageProtocol

    VANJacobsonCompression

    ICMPRouter

    DiscoveryProtocol

    AddressResolution

    Protocol

    ReverseAddressResolutionProtocol

    InverseAddress

    ResolutionProtocol

    AddressResolution

    SerialLineAddressResolutionProtocol

    WellfleetSourceRouteBridging

    NextHopRouting

    Protocol

    RoutingandTunnelingProtocols

    CiscoPropertties

    OtherProperties

    PPPinHDLC-likeframing

    Multi-ProtocolLabelSwitching

    Point-toPointOverEthernet

    XpressTransferProtocol

    802.1GARPMulticastRegistrationProtocol

    IPwithinIP

    CiscoDiscoveryProtocol

    Newbridge

    RoutingProtocol

    CiscoGroupManagementProtocol

    D yn am ic I SL V LA N Tr un kProtocol

    SerialLikeEncapsulation

    CiscoInter-SwitchLinkProtocol

    InterfaceProtocolLevel3

    RemoteProgram

    Load

    HighPerformanceRouting AdvancedPeertoPeerNetworking (Novell)Routing

    InformationProtocol

    Routing

    NetwareLink

    ServicesProtocol

    InternetPacketExchange

    AnyNetMulti-ProtocolTransportNetworking

    PacketLayerProtocol

    PacketSwitchedSignalingbetweenPublicNetworks

    EndSystemtoIntermediateSystemRouting

    ConnectionlessNetworkProtocol

    ISORouting

    IntermediateSystemtoIntermediateSystemRouting

    IntraDomainRoutingProtocol

    ConsolidatedLinkLayerManagement

    AnnexA

    AnnexD

    SwitchedVirtualConnectionControl

    Message

    LocalManagementInterface

    LinkAccessProcedureforFrameModeBearer

    Services(LAPF)

    50ohmcoax

    50ohmcoax

    75ohmcoax

    (Ethernet)MediumAccessControl

    (Token-Ring)MediumAccess

    Control

    SourceRouting

    Indicators

    FDDIStation

    Management

    LogicalLinkControl

    SubNetworkAccessProtocol

    FDDIStationManagement

    MediumAccess

    Control

    FiberDistributedDataInterface100MbpsTokenRing4/16Mbps

    4/16Mbps

    4/16Mbps

    4/16Mbps

    GigabitEthernet

    100Mbps

    100Mbps1.544Mbps

    6 4K bps 3 4. 36 8M bp s

    ManMac

    InterfaceProtocolLevel1

    SMDS

    45Mbps

    2.048Mbps100Mbps

    Multi-LinkProtocol

    PasswordAuthenticationProtocol

    ChallengeHandshakeProtocol

    Service-SpecificConnection-OrientedProtocol

    SDH/SONET

    51.840Mbps1 55 .5 2 Mb ps 6 22 M bp s 2 .4 88 G bp s

    6 . 24 M b ps 3 4 M bp s

    1 . 54 4 M bp s 2 M bp s

    PDH-G.804

    100Mbps

    140Mbps45Mbps

    BanyanVINESControl

    Protocol

    ControlProtocols

    CiscoSystemsControlProtocol

    DECnetRoutingProtocol

    InternetProtocolControlProtocol

    InternetworkPacket

    ExchangeControlProtocol

    XNSControlProtocolAppleTalkControlProtocolOSINetworkLayerControl

    ProtocolMulti-LinkProtocol

    Microsoft

    P2PEncryption

    Point-to-PointProtocol

    BridgingControlProtocol

    3 84 K bp s 1 .5 36 M bp s16KbpsBRI64KbpsPRI

    1.92Mbps

    OperationsandMaintenance

    PrivateNetwork-to-Network

    Interface

    PerformanceReport

    Message

    LinkAccessProcedureD

    Channel

    64Kbps

    SynchronousDataLinkControl

    IBMRT

    DistributedServicesHeader

    Switch-to-SwitchProtocol

    DataLinkSwitching

    QualifiedLogicalLinkControl

    InterimLocal

    ManagementInterface

    LANEmulation

    CircuitEmulation

    Service

    MotionPictureExpertGroup

    MultiProtocolOverATM

    DataExchangeInterface

    DataExchangeInterface

    DataExchange

    Interface

    LocalManagementInterface

    InterfaceProtocolLevel2

    MultimediaConferencing

    Loadbalancedswitch-to-switchtrunkingonVLAN

    ExtendedGateway

    ControlProtocol

    CodecsSupported:G.711,G.729,G.723

    CompressionControlProtocol

    BandwidthAllocationControlProtocol

    OpticalSignalingProtocol

    OpticalRouting

    Protocol

    TransportOverhead SerialLineInterfaceProtocol

    ShortMessagePeertoPeer

    ExtensibleAuthenticationProtocol

    MultilinkProtocol RealTimeStreamingProtocol

    LinkManagementProtocol

    SkinnyStationProtocol

    BorderGatewayMulticastProtocol

    R PR IN T R SH EL L

    GIOP

    IIOP

    TACACS+

    TACACS

    R LO GI N R EX ECSMTP

    XWindows

    LDAP

    NetBIOS-NS

    ISO DE

    Trailers

    IPv6

    RIPv6

    SCTP

    MTP3

    SCCP

    SCMG

    ISUP

    O S P Fv 6 I C MP v 6

    VJC

    IRDP

    Ethernet

    Ethernet

    ThinWire

    DIX V2

    TCPComp

    FTP Telnet

    IRCNNTP Gopher

    HTTP WWWPOP3 TDP

    RWHO

    NTP

    CMOT

    SNMP V1

    DISP

    SNMP V3

    RTSP

    BOOTP

    ND

    DHCP

    NIS

    NFS PMAP

    MOUNT

    H.323Telephony

    &MultimediaApplications

    RPC

    SNMP V2

    Q.931

    H.248MEGACO+TextVariant

    MGCP

    SGCP

    H.450.1-.9

    FP

    MAC

    IuUP

    GTP

    MIP

    3COM 3G

    RLP

    WDP

    WTP

    WSP

    OTASI

    SLUAProfile

    WCMP

    RLP

    CESHi DENMOBIS

    RLC

    SIP

    H.245

    T.120,T.122,T.123,T.125

    GGP

    NHRP

    DNS

    NetBIOS-SSN

    BGP LDP MSDP RUDP MGCP

    GDPSGCP XGCP MBGP PPTP

    HSRP STUN RSRB XOT

    TCP

    LPP

    NetBIOS-DG

    IARP

    MAC

    IEEE 802.5

    Broadband

    100VG-AnyLan

    10BASE-T

    10BASE-5

    10BASE-2

    10BASE-F

    10BROAD 36

    1BASE-5

    ICMP

    IP

    ARP

    RTCP

    RAS

    RTP

    L2TP

    I P- SE C D IF FS ER V

    Radius

    RadiusAccounting

    L2F

    IBMNM

    SMB

    SNA/MS

    DDM

    DCA

    SNA/FS

    DIA

    SNA/DS

    NWWDOG

    NWBCAST

    UDP

    OSPFEGP

    RARP

    100BASE-T

    100BASE-F

    Shielded TwistedPair

    UnshieldedTwisted Pair

    Fiber Optic

    IEEE802.1p

    IEEE802.1Q

    IEEE 802.3z

    Fiber Optic

    Twisted PairSDDI

    Twisted PairCDDI

    DS0PLCP

    DS1PLCP

    IEEE802.3CSMA/CD

    RI SMT

    802.2

    SNAP

    SLARP Cisco

    Transmission Control Request/ResponseHeader

    E1PLCP

    DS3PLCP

    E3PLCP

    802.6DQDB

    IEEE 802.6

    Wellfleet SRB

    802.1Spanning Tree

    SMT

    FDDI - MAC

    FDDI

    SIP L2SMDS

    DXI (Cisco)

    DXI (SMDS)

    LMI (SMDS)

    ILMI(ATM)

    SDLC

    IBM RT

    IGMP DVMRP

    P IM -D M P IM -S M

    MOSPF VRRP IPinIP

    RSVP

    E-IGRP IGP IGRP RSRB

    GRE

    RIP

    XTPHDLC POS IPinIPMPLS PPPOE GMRP

    VTPCDP

    VIVID

    ISLCGMP DISL SLE

    SIP L3SMDS

    SIP L1SMDS

    OC-1STM-1OC-3

    STM-4OC-12

    STM-16OC-48

    3270DataStream

    SSP

    DLSw

    QLLC

    MPTN

    IPX

    IPX WAN

    Echo(IPX)

    SCS

    IPSDLU6.2

    Data Flow ControlNetBIOS

    SPX SPX ll

    NetBIOS

    ISOSP

    ISO PP

    ROSE

    ACSE

    PAD

    NWDiag

    NWSERIAL

    NDS

    NCP

    RSTAT

    NLP

    LSP

    SAP

    CMIP

    X.500 MMS

    FTAM VTPCMISE

    ODA X.400

    RTSE

    TP0 TP1 TP2 TP3 TP4

    CLNP

    AFP

    M ai l Sl ot s M S- R AP N am ed P ip es

    IPNetBIOS(SSN)

    IPNetBIOS(DGM)

    SMBTCP

    CIFS / SMBCommon Internet File System/ Server Message Block

    KSP

    ZIP

    ASPSoftTalk

    TOPS

    Postscript

    PAP

    MNRPMNLP

    ASP (CDPD)SNDCP

    RRM

    MDLP

    MAC (CDPD)

    CellularModems

    HPR APPN Error (IPX)

    Path ControlRPL NetBIOS

    NetBEUI

    RIP NLSP

    X.25 X.75

    MLP(X.25)

    Q.2931 3.1

    4.0 PNNI

    Signaling UNI(ATM)

    Signaling NNI

    UNI3.0

    Q.SAAL

    MPOA

    LANE(ATM)

    CESMPEG-2

    AAL1 AAL2 AAL3/4 AAL5

    ATM Cells DXI (ATM)

    DS1 E1

    D S2 /J 2 E3

    DS3 DS4

    TAXI

    25 MbpsATM

    OAM (ATM)

    SSCOP

    PNNI(ATM)

    Q.931

    GR-303

    DASS2

    DPNSS

    PRM

    LAPD

    PPP

    CHAP(PPP)

    PAP (PPP)

    MLP(PPP)

    MPPEBVCP

    OSINLCP

    CSCP

    DNCP

    ATCP XNSCP

    IPXCP

    IPCPQ.933

    T1.617

    SVC(FrameRelay)

    LMI(FrameRelay)

    FRAME RELAY

    CLLM

    HDLC

    LAPB

    Wellfleet PPP

    Router Bridge

    LLAP AARP

    ES-IS IS-IS IDRPDDP

    ATP ADSP

    NBPAEP

    AURP

    RTMP

    BCP

    ISDNH12ISDN-DISDNH11I SD N- B I SD N H0

    V.24or

    RS-232V.35

    V.36or

    RS-449RS-530

    V.11or

    X.21

    V.21

    V. 27 bi s V. 29

    V.22 AT&T 209

    HSSI DS3 E3 E1 DS1

    V.26bisV.26V.22bis

    V.32

    V.33 V. 42 V. 42 bi s

    AirlinkSecurity

    XGCP

    FromTCP

    CommonOpenPolicyService

    COPS

    ISDNVariant

    Motorola&BritishTelecom

    DASS2/DPNSS

    CCP BAC/BACP

    OSP ORP

    TOH

    LCP

    SMPPEAP

    TrivalFile

    TransferProtocol

    TFTP

    MP RTSP

    LMP

    BGMP

    SSP

    RRC

    TCP/IPProtocol Suite

    MicrosoftProtocol Suite

    Virtual Private NetworkProtocol Suite

    Sun NFSProtocol Suite

    Media over IPProtocol Suites

    MobileProtocol Suites

    IBMProtocol Suite

    Novell NetwareProtocol Suite

    X.25Protocol Suite

    ISOProtocol Suite

    AppleTalkProtocol Suite

    Other SuppProtocol S

    Banyan Vin

    DECnet IVDECnet V

    XNS

    3COM

    UnitedStates:(tel)18004524844

    Canada:(tel)18778944414

    (fax)(905)282-6495

    China:(tel)800-810-0189(fax)1-0800-650-0121

    Europe:(tel)(3120)5472323(fax)(31 20)5472390

    Japan:(tel)(81) 426567832(fax)(81)426 567840

    Korea:(tel)(82-2)2004-5004(fax)(82-2)2004-5115

    LatinAmerica:(tel)(305)269 7500(fax)(305)269 7599

    Taiwan:(tel)080-004-7866(fax)(886-2)2545-6723

    OtherAsiaPacificCountries:(tel)(65) 375-8100(fax)(65)836-0252

    Email:[email protected]

    Byinternet,phoneorfax,get assistancewithallyourTestand Measurementneeds.

    Onlineassistance:http://www.agilent.com/find/assist

    Productspecificationsanddesdocumentsubjecttochangew

    2001AgilentTechnologies,InPrintedinUSAAugust2, 2001

    *5968-5968-

    When a single hour of network downtime can cost millions

    www.agilent.com/comms/onenetworks

    ApplicationLayer

    Topend-userlayer.

    Providesappropriatesemanticsormeaningtotransferreddata.

    Providesfor setupandterminationofassociationsbetweenapplicationprocesses.

    Providesvirtualterminal,file andjobtransferandmanipulationservices.

    PresentationLayer

    Thirdend-userlayer.Managesandtransfers end-user

    data-unitsyntax.

    Isolatesapplicationlayerprocessesfromdifferencesindatarepresentationandsyntax.

    Initiatesandterminatesconnectionsandhandleserrors.

    SessionLayerSecondof fourend-userfunctionlayers.

    Controlsestablishmentand terminationofsessionsbetweentwoend users.

    Managessessionto ensureorderlydeliveryofinformationordata.

    Managesparameternegotiationandsynchronizesconnectiondataflow.

    TransportLayerLowestof thehigher-layerprotocols

    whichprovideend-userfunctions.

    Utilizesnetworklayer toensurereliable,sequenced data exchangebetweenendusers.

    Can be connection or connectionless(datagram)oriented.

    Datagramsareseparately routedandmayarriveout ofsequence.

    Connectionorientedservicesprovideavirtualconnectionoverwhichallpacketstravelinsequence.

    Segmentsmessages intosmallerunits(packets)fortransmission.

    NetworkLayerLastNetwork Serviceslayer.

    Dataunits arecalledpackets.

    Usesdata linklayertoensure errorfreedeliveryofdata.

    Usesuniquesource anddestinationnetworkaddressestoroute packets

    throughtheinternetwork.

    Providesflowand congestioncontroltopreventnetworkresource(buffers,transmissionlinks,etc.)depletion.

    DataLinkLayerSecondNetworkServices layer.

    Blocksof dataarecalledframes.

    Ensuresreliableanderror-freedatatransferacrosslinksbetweenadjacentnetworknodes.

    Linksmay bephysical,e.g.point-to-pointWAN,ora virtuallinkbetweentwonodeson amulti-accessLAN.

    Concernedwithbit synchronization,recognizing end of blockanddetectionandcorrectionofbiterrors,usuallybyretransmission.

    Framesare composedofnetworklayerpacketsandcontrolinformation.

    Controlinformationmay beintheformofheaders ortrailers.

    Controlinformationallowsthereceivingnodetoperformsynchronizationanderrordetection.

    PhysicalLayer

    Firstof threeNetworkServiceslayers.

    Concernedwiththe physicaltransmissionofdatabits.

    Specificto themedia,e.g.optical,copper,coax,RF,twistedpair,etc.

    Specifiesdata signalencodingandmagnitudesandphysicalconnectorspecificationsandpinouts.

    Ensuresthat abitenteringat oneendofthe transmissionmediareachestheotherend.


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