Διαφάνεια PPT

Application program makes contact with network application for e-mail

Application

Convert data into a form which can be transmitted

Presentation

Contact remote system and request a transmission

Session

Negotiate data transfer and split data into segments

Transport

Add source and destination addresses

Network

Data packet converting into a form which can be transmitted over the network

Data link

The data frame is converted into binary form and transmitted over a physical connection

Physical

E-mail application program

Hello.

Fred.

To: Fred

From: Bert

Hello.

Fred.

HELO sys.com

FOR Fred

To: Fred

From: Bert

Hello.

Fred.

Seg 1

Seg 2

Seg 3

Seg 1

Addr

Seg 2

Addr

Seg 3

Addr

Seg 1

Addr

Start

End

5.1 Data encapsulation

Seg 2

Addr

Start

End

Seg 3

Addr

Start

End

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