VPN/Tunneling Protocols??

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There is a lack of clarity in which protocols authenicate, encrypt and can be used as server to server or client to client communication in the books I am using.
Here is what i get:
PPTP
Provides authentication and encryption between two endpoints.
Authentication uses MS-CHAP,CHAP,PAP<EAP
No idea how it encrypts
Layer 2 protocol

PPPoE
No encryption (no idea why)
Authenticates ???

L2TP
2 phase authentication: Computer then user
No encryption - uses IPSEC???

IPSEC
TCP/IP Protocol - Layer 3
Authenticates and encrypts using Authentication Header and Encapsulating Security Payload ensuring data verification and integrity.


Please feel free to add as without knowing the whole picture this is not sticking in my head.....

Cheers,
Dazza D

 

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PPTP can use MPPE to encrypt its contents when using MSCHAP and EAP.

PPPoE is, I think, layer 2, so is a method of moving packets..... (off the top of my head).

 

You might want to have a look here, i have read the first page and I think you will find a few answers in it.
Point-to-point protocol over Ethernet - Wikipedia, the free encyclopedia

And again for L2TP issue, look here:
Layer 2 Tunneling Protocol - Wikipedia, the free encyclopedia