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Domains, realms, and forests

BlackBerry UEM
 operating in a 
single-realm
 
Kerberos
 environment consists of one core, or multiple cores that are configured identically. 
BlackBerry UEM
 operating in a 
multi-realm
 
Kerberos
 environment consists of multiple cores that are configured separately.
realm 
is a collection of entities, either user realms or resource realms. A resource realm is any realm other than a user realm. In 
Kerberos
, the realm name must always be typed in uppercase characters.
domain 
is a directory service domain, most frequently from Active Directory. 
The terms realm and domain are interchangeable in KCD.