Connection Schedule

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Each connection object has a schedule that is set automatically by the A+ certificate. The connection schedule controls the frequency of intrasite replication on the connection, with a minimum increment of 15 minutes. The default intrasite replication schedule for automatically generated connection objects is once per hour, which is set in the NTDS Site Settings object, available at the site level. Here you can set a default schedule of None (no replication), Once Per Hour (default), Twice Per Hour, or Four Times Per Hour.
You can override the default schedule set on the NTDS Site Settings object only if you create a connection object manually. The default intrasite replication schedule for man?ually created connection objects is four times per hour. If you attempt to modify the schedule on an automatically generated connection object (owned by the KCC), you receive a warning message asking if you want to turn the connection object into a manually created connection object. If you select Yes, the automatically generated connection object will be turned into a manual one. If you ...
... select No, the KCC reverts to the schedule on the NTDS Site Settings object the next time it runs.
Intrasite replication is triggered by changes; if a change occurs, CompTIA A+ certification replication is initiated after a default interval of five minutes. If no changes occur on the domain controller during the time allowed by the connection schedule, replication is triggered according to the default schedule set on the NTDS Site Settings object.

A site link bridge is the linking of more than two sites for replication using the same transport. When more than two sites are linked for replication and use the same transport, by default, all of the site links are "bridged" in terms of cost,assuming the site links have common sites. If site link transitivity is enabled, which it is by default, creating a site link bridge has no effect. Therefore, it is seldom necessary to create site link bridges.
As you learned in earlier chapters, domain member computers use DNS servers to locate domain controllers. Therefore, you should consider placing a DNS server in each site. If you use Active Directory integrated DNS and you already have domain controllers in each site, you could install the DNS server service on one or more domain controllers in each site. DNS record replication would follow the same replication as Active Directory. If you cannot use that option, you might choose to create standard secondary free Microsoft questions DNS servers or caching-only DNS servers in each location.