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Full Discussion: The OSI-model
Special Forums IP Networking The OSI-model Post 17863 by thomas.jones on Wednesday 20th of March 2002 07:38:06 PM
Old 03-20-2002
You are partially correct! The data does traverse down the OSI model on the source node.......across the network medium.......to the destination node....and back up the OSI model.

BUT, transmissions do not have to actually start at the application level. Have you ever heard of two or three tier routers? They only use part of the OSI model.....hence two or three layers are transmitted....not all 7.

It goes like this:

Data to be sent in this datagram = XXXXXXXXXX

Layer 7 puts on application specific headers:

AAXXXXXXXXXXA

Then Layer 6 for presentation:

PPAAXXXXXXXXXXAP

Then Layer 5 does the same on a session basis:

SSPPAAXXXXXXXXXXAPS

Layer 4 for transport portion:

TTSSPPAAXXXXXXXXXXAPST

Layer 3 goes next:

NNTTSSPPAAXXXXXXXXXXAPSTN

Layer 2 puts on the Data Link layer stuff:

DDNNTTSSPPAAXXXXXXXXXXAPSTND

The finally the Physical layer:

PPDDNNTTSSPPAAXXXXXXXXXXAPSTNDP

This is then transmitted. At the destination...each layer strips the corresponding layer and sends it up to the next layer....etc.

This is very basic...it's more complex than this tutorial...each layer does not have the same size of headers...and such...but this gets the idea across.
 

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BF-model-EDITOR(1)					      General Commands Manual						BF-model-EDITOR(1)

NAME
bf-model-editor -- The model editor for the Bear Engine. SYNOPSIS
bf-model-editor [-h] [--log-concise] [--log-file=file] [--log-level=string] [--log-uniq] [-c] [-u] file(s) ... DESCRIPTION
This program is the model editor for the Bear Engine. This is a part of the Bear Factory. OPTIONS
The following options can be passed to the program: -c, --compile Compile the files and exit. -h, --help Show summary of options. --log-file=file Write log output in "file". --log-level=string Output log messages up to a given level, among "error", "warning" and "verbose". -u, --update Open and save the model files. -v, --version Print the version of the editor and exit. SEE ALSO
running-bear(6), bf-animation-editor(1), bf-level-editor(1) AUTHOR
This manual page was written by Julien Jorge julien.jorge@gamned.org. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. BF-model-EDITOR(1)
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