OSI LAYER 1 (PHYSICAL LAYER) THROUGH LAYER 4 (TRANSPORT LAYER) provide the foundation for sending and receiving data between network nodes. But that’s only part of what you need to support rich networked communications. It’s kind of like driving from one city to another. To get there and back, you’ll need to have roads and bridges to drive on. You need to know the laws governing each state or county along the way, and you need to understand the signs that tell you things like speed limit and highway number. All of these things make up the infrastructure ...
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