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Beginner

PPP vs PPoE

Hello All,

 

I am studying for my CCNA and I am having some problems understanding PPP vs PPPoE.

 

The way I understand it is that PPP is serial communication Layer two protocol. It helps establish and authenticate a connection between two nodes.. PPPoE encapsulates PPP into a frame? but isn't PPP a frame since it s a layer 2 protocol?

 

Why is PPPoE needed at all? I have not found a good explanation.

 

Thank you!

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VIP Expert

I believe you often find PPPoE when working with ADSL, which is often based on ATM. I think (?) the PPPoE is really mostly used to validate you host is allowed to use the link. (I do know, it takes a few bytes from the IP MTU.)
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