OSI Model Data Communications. 7 layer “research” model ApplicationPresentationSessionTransportNetworkLinkPhysical.

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Presentation transcript:

OSI Model Data Communications

7 layer “research” model ApplicationPresentationSessionTransportNetworkLinkPhysical

5 layer “real-life” model Application (presentation session) TransportNetworkLinkPhysical

Introduction Internet protocol stack application: supporting network applications – FTP, SMTP, HTTP transport: process-process data transfer – TCP, UDP network: routing of datagrams from source to destination – IP, routing protocols link: data transfer between neighboring network elements – Ethernet, (WiFi), PPP physical: bits “on the wire” application transport network link physical 1-4

Introduction ISO/OSI reference model presentation: allow applications to interpret meaning of data, e.g., encryption, compression, machine-specific conventions session: synchronization, checkpointing, recovery of data exchange Internet stack “missing” these layers! – these services, if needed, must be implemented in application – needed? application presentation session transport network link physical 1-5