What happens in Vegas gets moved by heavy equipment

There's a new tourist attraction opening up in Las Vegas.
Recreational heavy equipment operation, where you can spend a couple of hours driving a bulldozer or excavator around and making/filling/relocating big holes in the dirt.

That's pretty cool, right there.

boring-assed tech question about LDAP

So, LDAP. And NAT.
When something connects to an LDAP server, does it identify/authenticate itself via something in the actual LDAP connection? Or does the LDAP server rely on the source IP of the connecting host to figure out if the client is or can get to privileged objects?