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What is the OSI model? Memorize each of its seven layers

Network World | Oct 6, 2020

Learn each of the seven layers of the Open Systems Interconnection, or OSI, model with this easy mnemonic trick. The OSI Model was developed in order to help troubleshoot network problems, promote interoperability among devices, and to simplify the task of writing network protocols.

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Script for Mnemonics for remembering the seven-layer OSI model
When discussing networking it’s handy to have an abstract conception of the different types of connections needed in order to successfully complete data transfers.
Such a model was developed in order to help troubleshoot network problems, promote interoperability among devices, and to simplify the task of writing network protocols. More broadly, it provides an overall framework for understanding networking complexities.
Known as the Open Systems Interconnection or OSI model, it has seven layers, each describing a different type of connectivity. Very briefly, those layers are as follows: Layer one – Physical. This includes the cable and wireless connections among devices as well as specifications of the jacks and plugs, voltages, etc.
Layer 2: Data link. This layer provides the direct protocol connection between two nodes on a network and handles error correction from the physical layer.
Layer 3: Network. This is the routing layer at which packets are forwarded from their source to their destination.
Layer 4: Transport. This layer coordinates the transfer of data between systems and hosts by specifying such things as how much data to send and at what rate.
Layer 5: Session. For two devices to transact specific functions between each other, a session is required, and this layer handles setting up sessions, coordinating the rules for communication – such as how long to wait for responses – and how to terminate the session.
Layer 6: Presentation. At this layer data is prepared for presentation between layers. For example, data that is encrypted across a network would be decrypted at this layer for presentation to an application at the destination device.
Layer 7: Application. This is they layer at which applications are displayed to the end user.
That’s all pretty complicated, and it helps to have a simple way to remember the names and the order of the seven layers.
Fortunately, people have come up with memory tricks to help remember them from Layer 1 to Layer 7 and also from Layer 7 to Layer 1. Here are a few of them.
First, here are some tricks for remembering the layers from Layer 1 to Layer 7.
Please Do Not Throw Sausage Pizza Away
Pew! Dead Ninja Turtles Smell Particularly Awful
People Don’t Need To See Paula Abdul
Pete Doesn’t Need To Sell Pickles Anymore

And these are from Layer 7 down to Layer 1:
Anchovy Pizza Should Tempt Nobody’s Delicate Palate
All Pros Search Top Notch Donut Places
A Penguin Said That Nobody Drinks Pepsi
A Priest Saw Two Nuns Doing Pushups
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