Knowing the OSI model and the names of the layers is useful
because most networking jargon refers to protocols and standards relative to the
OSI model. For instance, IP sits at the internetwork layer of TCP/IP. That layer is most
closely related to the OSI network layer,
or OSI Layer 3. So, using popular networking jargon today, IP would be a network layer protocol. Notice that this term
uses OSI's name for the equivalent layer and does not use internetworkthe name
of TCP/IP's equivalent layer.
Here are some more examples of phrases you might use today,
relating to OSI terminology:
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TCP is a Layer 4 protocol.
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IP is a Layer 3 protocol.
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LANs define both Layer 1 and Layer 2 protocols.
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WANs define both Layer 1 and Layer 2 protocols.
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TCP is a transport layer protocol.
If you are new to networking, you will likely never use a
network that implements the OSI model. I've been in networking more than 20
yearsI even worked at IBM when they thought that OSI would take over the world
of networkingand I've never used a computer with a full implementation of OSI.
But, some of the jargon stuck around. So, if you haven't already, you should
memorize the layers of the OSI model and how they relate to the TCP/IP model.
If you want some tricks to help you remember the first letters
of the names of the seven layers, you might benefit from the following list of
mnemonic phrases. The first letters in each word of these phrases match the
first letters of the OSI layer names:
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- All People Seem To Need Data Processing (Layer 7 to 1)
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- Please Do Not Throw Sausage Pizzas Away (Layer 1 to 7)
-
- Pew! Dead Ninja Turtles Smell Particularly Awful (Layer 1 to
7)
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