The OSI Reference Model Continued

APPLICATION

PRESENTATION

SESSION

TRANSPORT

NETWORK

DATA LINK

PHYSICAL

Manages the communication

between applications

Adds structure to the

exchanged data units

Adds control mechanisms

to exchanged data

Transfers and multiplexes data

reliably across the network

Transfers data over the network

independent of media and

topology of sub-networks

Transfers data over a single

communications link, does

framing and error control

Responsible for the electro-mechanical

interface to the communications media

A letter mailed

and received

The envelope layout

Address, return address

postage on envelope

The US Postal

Service

The Postal Service ground

and air transportation

network

A mail truck from post

office to airport

The truck

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