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PPP is a protocol that encapsulate data for point to point communication between 2 device that know mac address of each other ( I say they are in a scope that can see each other)

why we need PPPOE and then Ethernet frame ? why PPP must encapsulate in PPPOE then PPPOE encapsulate in Ethernet frame ?

PPPOE and Ethernet frame use mac address but i have those info in PPP why doing something unnecessary ?

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