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When things get a little complicated in networking, I like to remind myself that "it's all ones and zeroes!" Whatever data our end users are creating, it's going to eventually be "translated" into a series of 1s and 0s. Once that is done, it's the Physical layer that handles the actual data transmission. Anything to do with a physical cable or the standards in use - the pins, the connectors, the electrical current itself - is running at the Physical layer.
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When things get a little complicated in networking, I like to remind myself that "it's all ones and zeroes!" Whatever data our end users are creating, it's going to eventually be "translated" into a series of 1s and 0s. Once that is done, it's the Physical layer that handles the actual data transmission. Anything to do with a physical cable or the standards in use - the pins, the connectors, the electrical current itself - is running at the Physical layer.
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