Preferred Bridgehead server ,RPC ,SMTP

admin

Hi all
I was trying to make sense of this line in the training kit but could not understand "If you specify preferrred bridgehead server you must assign one bridgehead server for each domain and writable directory partition combination in your forest which might result in high cost in large organization"

Also it is mentioned when you set a preferred bridgehead server, ensure that you choose servers that are capable of replicating the topology
For example, if you have two domain controllers in a site, and domaincontroller1 is a global catalog server, and domaincontroller2 is not, when you choose domaincontroller2 to be the preferred bridgehead, if Active Directory uses domaincontroller1 to replicate read-only domains, the KCC must creates a new connection using domaincontroller1 as a bridgehead server. An event 1567 message is reported that states a non-preferred bridgehead was used


In Inter-site-Messaging-Simple Mail Transport Protocol (ISM-SMTP) it says
that SMTP site links work asynchronously and transaction can be stored
on destination server is unavailable How does SMTP transport exactly work and why is that SMTP requires CA and RPC does not require it


thanks in advance