Application (Layer 4 or L4): This layer loosely corresponds to Layers 5 through 7 of the OSI model.
Transport (Layer 3 or L3): This layer corresponds to Layer 4 of the OSI model.
Internet (Layer 2 or L2): This layer corresponds to Layer 3 of the OSI model.
Network Access (Layer 1 or L1): This layer corresponds to Layers 1 and 2 of the OSI model
The 7 layers of the OSI model. The layers are: Layer 1—Physical; Layer 2—Data Link; Layer 3—Network; Layer 4—Transport; Layer 5—Session; Layer 6—Presentation; Layer 7—Application.
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