Choosing SMTP or IP Replication
By default, most connections between sites in AD DS utilize IP for replication because the default protocol used, Remote Procedure Call (RPC), is more efficient and faster. However, in some cases, it might be wiser to utilize SMTP-based replication. For example, if the physical links on which the replication traffic passes are not always on (or intermittent), Simple Mail Transport Protocol (SMTP) traffic might be more ideal because RPC has a much lower retry threshold.
A second common use for SMTP connections is in cases where replication needs to be encrypted so as to cross unsecured physical links, such as the Internet. SMTP can be encrypted through the use of a certificate authority (CA) so that an organization ...
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