OSI Model
Networking is based on the OSI model:
Each layer has a meaning in networking. We will not cover the layers in depth, but you can read more about in the Further Reading section.
Networking is based on the OSI model, it is a bit like the layers of a cake, often referred as L1, L2, L3, etc..
Let’s pick some real life examples:
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L1 = a router, a switch, a cable, anything physical
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L2 = a switch, a MAC address
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L3 = a router, an IP address
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L4 = online streaming
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L5 = when you connect to an application
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L6 = when you used Putty to login to your EC2 instance during Linux CloudOps workshop
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L7 = an application