Layers 5-6-7 : Session-Presentation-Application |
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Écrit par CCNA
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26-05-2008 |
- The Session Layer (Layer 5) starts, controls and terminates a connection creating a session or dialog between communicating systems.
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The Presentation Layer (Layer 6) deals with how the information is presented like format (.jpg, .wav, .mpg, ...), encryption/decryption, compression/decompression, ...
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Compression/Decompression : process of transmitting data in a reduced/expanded form
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Encryption/Decryption : process by which plain/cypher data is converted into cypher(coded)/plain data
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The Application Layer (Layer 7) is in charge of performing applications like web browsing (http 80), mail composing (smtp 25, pop3 110), file uploading & downloading (ftp 21), remotely accessing (telnet 23), ...
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Dernière mise à jour : ( 31-05-2008 )
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