Does SSO automatically get setup when using Websphere ND?

I setup WAS ND and installed JTS on one server and CCM/RQM on another server.  After going through the jts/setup, connecting users, creating project areas,etc. I logged into JTS and then selected an RQM Project on a separate server, fully expecting to have to login again.  But I didn't have to.

When I looked at the SSO settings in WAS ND it was already enabled.  I never enabled this or exported the LTPA keys. 

So now I'm wondering if WAS ND automatically sets up SSO when you define App Servers on multiple machines. Is this true?  I searched but couldn't find any confirmation on this.

When I used standard WAS and installed it on separate servers I had to go through the steps manually to setup SSO.