Enthuware

Is the answer to this correct?

I think that the realm is independent of the login mechanism. It simply defines users, groups and group memberships.

Yes, it is correct because when you use the "basic" authentication mechanism, you are presented with a "realm" within which your credentials are relevant. This is as per http://www.ietf.org/rfc/rfc2617.txt

HTH,
Paul.

In the link you specify, it says:

"The realm directive (case-insensitive) is required for all authentication schemes that issue a challenge."

In other words, regardless the way you give your credentials (BASIC, Form etc), those credentials will be validated against a realm.

You are right. I misunderstood it. Thanks for pointing it out.
All except client-cert. Client-cert doesn't issue a challenge.