The best way to memorize network layers, whether OSI or TCP/IP is to think up a mnemonic which can be a memorable phrase that is made up of words that start with the first letter of the name of each layer. It is better to make up the phrase yourself because a personalized system will include words that you will find easy to remember. Putting in your own name, if possible, or the names of your nearest and dearest is a good idea. Make the phrase as silly as possible so it will stick in your mind. Make sure to keep all of the phrases in the right order. It doesn’t matter if you work from top to bottom or bottom to top just as long as you remember which direction you chose.