newbie, afs file path question

[Troy Goodson]

I just installed the binary Arla distribution on my Darwin / Mac OS X 
machine.  I'm a complete newbie to AFS, but here's my question:

I use two different machines, one Mac OS X and the other HP-UX.  Both 
have some form of AFS installed.  On the HP-UX machine, the following 
path is valid and gives me access to my file:

/afs/jpl/user/t/tgoodson/www/index.html

On my Mac OS X machine, with Arla, the above path does not work, and 
I have to use this path:

/afs/jpl.nasa.gov/user/t/tgoodson/www/index.html

What's going on?