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- 2Keep reading... ethernet is layer's 1 and 2, IP is layer-3, TCP is layer-4, etc. While most of the world has become ethernet, it is not the only layer-2 to ever exist, or that still exists. Not to be confused with bridging of ethernet (L2 within L2)... wifi, xPON, DOCSIS,...Ricky– Ricky2025-08-18 02:10:19 +00:00Commented Aug 18 at 2:10
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