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- 4. Layer 2 Atthesecondlayer (Data Link) wehavethetranslatesPDUsfromhigherlayersinto data frames, Defines the LLC and MAC sublayers. TheProtocolsandServices are: – FrameRelay, PPP, HDLC, IEEE 802.2, 802.3, 802.5, FDDI, ATM, SDLC, LAPB and ISDN.
- 5. Layer 3 Thethirdlayerit’sthe Network. It’sconcernedwithend-to-enddeliveryof data, logicaladdressing, androutingandhowroutes are identified. ProtocolsandServices: – IP, IPX andAppleTalk DDP.
- 6. Layer 4 Thequadlayerit’stheTransport, itsaboutsegmentsandreassembles data. Defines riableandunrealiable data transmissionandconnection-orientedandconnectionlessprotocols. TCP, UDP, SPX are theProtocolsandServices.
- 7. Layer 5 ThefifthlayeristheSession. ItEstablishes, controls, andendssessions, Full-andhalf-duplexcommunications. ProtocolsandServices: - NFS, SQL, NetBIOS, AppleTalk ASP, X Windows, RPC, DECNet SCP.
- 8. Layer 6 ThePresentationisthesixthlayer. Defines data formats, includingencryption, data conversion, audio / visul, andgraphics. There are a fewProtocolsandServiceslike: - MPEG, HTML, MIDI, ASCII, EBCDIC, TIFF, GIF, PICT.
- 9. Layer 7 Finalytheseventhlayer, theAplication – Identifiesandestablishesavaibilityofcommunicationpartners. Determines whetherresources are sufficientfforthecommunication to occur. ProtocolsandServices: - FTP, SMTP, Telnet, Web Browsers, CMIP, and Virtual Terminal Protocol.