The document discusses the 7 layers of the OSI model: 1) Physical layer - Defines physical medium for sending and receiving data bits. 2) Data link layer - Translates data and defines logical link control and media access control. 3) Network layer - Handles end-to-end delivery, logical addressing, and routing. 4) Transport layer - Segments and reassembles data and defines reliable/unreliable transmission.

1. Modelo OSI CamadasDisciplina: Instalação e Configuração de ComputadoresTrabalho elaborado por: Mário Lucas 8ºH

2. Physical – defines the characteristics of the physical medium used to send and receive data bits.Protocol and service- EIA/TIA 232 and 449, RJ45, Ethernet, CAT 5, X.21, HSSIO modelo OSI camada 1

3. Data link – TranslatesPDUsfromhigherlayersinto data frames. Defines the LLC and MAC sublayers.Protocolandservice – FrameRelay, PPP, HDLC, IEEE 802.2, 802.3, 802.5, FDDI, ATM, SDLC, LAPB, ISDN.O modelo OSI camada 2

4. Netwark– concernedwithend-to-enddeliveryof data, logicaladdressing, androutingandhowroutes are identified.Protocolandservice – IP, IPX, and Apple Talk DDPO modelo OSI camada 3

5. Transport– segmentsandreassembles data. Defines reliableandunreliable data transmission, andconnection-orientedandconnectionlessprotocols.ProtocolandService – TCP, UDP, SPXO modelo OSI camada 4

6. Session – Establishes, controls, and ends sessions. Full-and half-duplex communications.Protocols and Services – NFS, SQLM NetBIOS, Apple Talk, ASP, X Windows, RPC, DECNet SCPO modelo OSI camada 5

7. Pressentation – Defines data formats, encluding encryption, data conversion, audio/ visual, and graphics.Protocol and Service – MPEG. HTML. MIDI, ASCII, EBCDIC, TIFF, GIF, PICT.O modelo OSI camada 6

8. Application– Identifiesandestablishesavailabilityofcommunicationpartners. Determines whetherresources are sufficient for thecommunication to occur.ProtocolandService – FTP, SMTP, Telnet, Web Browsers, CMIP, and Virtual Terminal ProtocolO modelo OSI camada 7

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