Cisco Seven OSI Model And Function

The Application layer
Provides a user interface such as: File. Messages, print, database and application services

The Presentation layer

Presents data

• Handles processing such as encryption: data encryption, Compression and translation services

The Session layer

Keeps different applications’ data separate: dialog control

The Transport layer

Provides reliable or unreliable delivery

• Performs error correction before retransmit:End to end connection

The Network layer

Provides logical addressing, which routers use for path determination: Routing

The Data Link layer

Combines packets into bytes and bytes into frames

• Provides access to media using MAC address

• Performs error detection not correction: framing

The Physical layer

Moves bits between devices

• Specifies voltage, wire speed, and pin-out cables : physical topology of a network.

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