Nds Replication - Novell NETWARE 6-DOCUMENTATION Manual

NDS Replication

NDS replica synchronization ensures that changes to NDS objects are
synchronized among all replicas of the partition. This means that any server
that holds a replica of a partition must communicate with the other servers to
synchronize a change.
In NetWare 6, NDS replica synchronization is more efficient and produces
less network traffic than previous versions, because instead of automatically
synchronizing replicas, servers are queried to find out if they are synchronized
or not. If a server is out of synchronization, the update is sent. But if the server
is synchronized, there is no need to send the update.
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Understanding Network Communications