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OSI Reference Model Layer Mnemonics
If you spend any amount of time at
all dealing with networking design or implementation issues, or learning
about how the various protocols operate, the names and numbers of the
various layers will eventually become second nature. Trust
me, I know this from experience!
Many people, however, especially
those just learning about networks, find it difficult to recall the
names of all the layers, and especially, what their exact order is.
To help these people, a number of mnemonics (pronounced neh-MON-iksanother
wonder of the English language) have been created as memory aids. These
are cute phrases where each word starts with the first letter of an
OSI model layer, arranged in the correct order.
Figure 18: OSI Reference Model Mnemonics
These mnemonics may help you to remember the order of the OSI Reference Model layers.
I have seen a few of them
in my time, some of which go in ascending layer number order, and some
of which go in the other direction. These two go from physical layer
to application layer:
- Please Do Not Throw Sausage Pizza Away
- Please Do Not Touch Steve's Pet Alligator
And these ones go the other direction
(application to physical):
- All People Seem To Need Data Processing (this
is a popular one)
- All People Standing Totally Naked Don't Perspire
(hmm, that's interesting
For your convenience, I have illustrated
all four of these in Figure 18.
Oh, and here's one I just made up:
All People Should Teach Networking Daily Please.
(Well, I like it! J)
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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