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Q: 

PPP authentication?

How does PPP behave when it comes to authentication or communication between two routers?

If both routers' serial interfaces include the command "encapsulation ppp" and nothing else, does it still require password? Or "ppp authentication PAP/CHAP" needs to be entered also? In any case, what password would PPP use to authenticate assuming no TACACS+/RADIUS is installed?

Thanks

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