Some examples that come to mind:
DDR links - these should have authentication so no unauthorized access 
is obtained.
Out-of-band management - a modem connected to a console/aux port (though 
not recommended)
Session authentication for ISP users - ISP users with dialup or PPPoE

Randy Mueller wrote:

> I've been doing a lot of reading on PPP these past few days, and while I think I 
>have a semi-decent understanding of how it works, I don't quite understand why PPP 
>authentication would be configured.
> 
> Can somebody provide some insight into a practical use, maybe point me to some case 
>studies or other links?
> 
> It's my understanding that it is primarily used on dial-up links, and that makes 
>sense.  But under what circumstances would it come into use?
> 
> Maybe somebody could just send me an example of it's use?
> 
> Thanks in advance for any assistance.
> Randy
> 
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