Single Domain
One domain
Centralized administration of accounts on the PDC
Centralized administration of resources
For organizations with fewer than 15,000 users
Trusts: no trusts needed
Master Domain
More than one domain, with one master domain and one or more resource domains
Centralized administration of accounts on the master domain
Local administration of resources on the resource domains
For organizations with fewer than 15,000 users
Trusts: all resource domains trust the master domain, but the resource domains don't trust one another
Multiple Master Domain
More than one domain, with one or more master domain and one or more resource domains
Centralized administration of accounts on the master domains
Local administration of resources on the resource domains
For organizations with more than 15,000 users
Trusts: all master domains trust one another, all resource domains trust the master domains, but the resource domains don't trust one another
Complete Trust Domain
More than one domain
Local administration of accounts
Local administration of resources
For organizations of any size
Trusts: every domain trusts every other domain