The OSI Model for Network Engineers by Rivas Al

Author:Rivas, Al
Language: eng
Format: epub
Publisher: NTC
Published: 2015-04-29T16:00:00+00:00

Port 69. UDP pitches up to TFTP.

This is what we call the de-encapsulation process. Basically as each Layer gets the data, it strips its information from it and passes what’s left to the Layer above.

The Encapsulation Process is the exact reverse of this. Where De-Encapsulation is done by the receiver, Encapsulation is carried out by the transmitter. In other words, as my transmission works its way down the stack, each Layer encodes its own information.

When the data got to Layer 4, TCP would enter the required Ports into the SEGMENT. At Layer 3, we’d take the segment created by TCP at Layer 4 and Encapsulate this with our required information at Layer 3 (for example, IP Addresses and Protocol Number). We’d now have a PACKET.

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