Physical layer information
This appendix provides information about the planning and management considerations for the physical layer.
About physical layer switches
The physical layer is the first, or number one, layer in standard protocol stacks, as shown in Figure C-1. The open systems interconnection (OSI) model on the left is often used as a reference protocol stack, and has seven well-defined layers. To the right of the OSI is the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol stack with 5 layers, driven more by pragmatism ...

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