According to 
http://jasig.github.io/cas/4.0.x/installation/LDAP-Authentication.html, 
LdapAuthenticationHandler can be configured to authenticate users with any of 
the following methods:
1.            Active Directory – users authenticate with sAMAAccountName
2.            Authenticated Search – Manager bind/search followed by user 
simple bind
3.            Anonymous Search – Anonymous search followed by user simple bind
4.            Direct Bind – Compute user DN from format string and perform 
simple bind
 
I would like to use Method 1 (Active Directory authentication using 
sAMAAccountName) if possible without using two-step authentication using a 
service account to obtain the user DN.  Is this possible without having all 
users in the same LDAP tree?

Methods 3 and 4 are not applicable to us, because our Active Directory LDAP 
server does not allow an anonymous search, nor does it have all users in the 
same LDAP branch.  Method 2 involves a two-step authentication, the first step 
via a read-only service account to determine the user DN, followed by the 
second step during which the user is authenticated.
 
Will Method 1 allow us to trim our authentication process into a single step?
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