LDAP authentication confusion

[Daniel Eischen]

There's an article on LDAP authentication on FreeBSD here:

   http://www.freebsd.org/doc/en/articles/ldap-auth/article.html#client

I'm confused as to why pam_ldap and nss_ldap do not need
/etc/pam.d entries, as described in the above link in
section 3.1.1.  Meaning, I do not have any ldap entries
in my /etc/pam.d/ or even /usr/local/etc/pam.d/ and
ldap logins work (console, ssh, telnet, ftp).

   $ grep -i ldap /etc/pam.d/*
   $ grep -i ldap /usr/local/etc/pam.d/*

What am I missing?

   $ uname -v
   FreeBSD slrtr1 9.1-STABLE FreeBSD 9.1-STABLE #0 r250347...
   $ uname -m
   amd64
   $ cat /etc/nsswitch.conf
   group: files ldap
   hosts: files dns
   networks: files
   passwd: files ldap
   shells: files
   services: files
   protocols: files
   rpc: files

-- 
DE