Referring to the Physical Layer of the OSI Reference Model. See also OSI Reference Model and Physical Layer.
"Layer 1." YourDictionary, n.d. Web. 09 December 2018. <https://www.yourdictionary.com/layer-1>.
Layer 1. (n.d.). Retrieved December 09th, 2018, from https://www.yourdictionary.com/layer-1
See OSI model and physical layer switch.
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