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Introducere
•Nivel, protocol, serviciu
•Modele de referinta
•Echipamente de retea
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Nivel, protocol, serviciu
• Arhitectura de retea este impartita in mai multe niveluri.
• La fiecare nivel exista un protocol care comunica cu protocolul aflat la acelasi nivel si care este situat la statia pereche.
• Pentru aceasta, fiecare protocol adauga mesajului informatiile necesare sub forma unui antet aflat inaintea mesajului.
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Nivel, protocol, serviciu (continuare)
• Protocolul reprezinta un set de reguli care guverneaza formatul si semnificatia cadrelor, pachetelor sau mesajelor schimbate intre ele de entitatile pereche dintr-un nivel.
• Serviciul reprezinta un set de primitive pe care un nivel le furnizeaza nivelului de deasupra sa si este definit in contextul unei interfete intre doua niveluri.
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Nivel, protocol, serviciu (continuare)
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Nivel, protocol, serviciu (continuare)
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Modele de referinta
• Exista doua modele de referinta importante si anume ISO OSI si TCP/IP
• Cele doua modele se mapeaza unul peste celalalt.
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Modelul ISO OSI
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Modelul TCP/IP
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Corespondenta dintre modeleleISO OSI si TCP/IP
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Echipamente de retea