When idsync resync is run without the -k option, which only links users, all synchronized attributes in the user entry are updated. In the previous examples in this overall section, the destinationindicator attribute is automatically populated with the correct Windows domain name. The cn and uid (Directory Server attributes) are also updated because they are synchronized.
The users are linked based on uid. The uid is already in sync, but the cn in Directory Server might be replaced with a value from Active Directory. This process might not be appropriate when Directory Server has the authority of these attributes.