Configuring Site Link Attributes
To ensure efficient replication and fault tolerance, you must configure MCITP certification exams site link cost, replication frequency, and replication availability information for all site links.
Configuring Site Link Cost
Configure site link cost to indicate the cost of the connection in relation to the speed of the link. Higher costs are used for slow links, and lower costs are used for fast links. For example, if you have a high-speed Tl line and a dial-up network connection in case the Tl line is unavailable, configure a lower cost for the Tl line and a higher cost for the dial-up network connection. Active Directory always chooses the connection on a percost basis, so the least expensive connection is used as long as it is available.
Configuring Site Link Replication Frequency.
Configure site link replication frequency for site links by providing an integer value that tells Active Directory how many minutes it should wait before using a connection to check for replication updates. The replication interval must be at least 15 and no more than 10,080 minutes (equal to one week). A site link must be available for any replication to occur, so if a site link is scheduled as unavailable when the number of minutes between replication updates has passed, no replication occurs.
If preferred bridgehead are servers available and you want to add another 70-686 exam preferred bridgehead server to the site, you do not have to add the server in both sites because the change replicates to the other site through the currently available bridgehead servers.
To configure intersite replication, you must create site links and configure site link attributes. Optionally, you can designate a preferred bridgehead server, create site link bridges, and create and configure connection objects. Directory information can be exchanged over site links using the DS-RPC or the ISM-SMTP protocols.
Site link attributes of cost, replication frequency, and replication availability are set in the Properties dialog box for a site link.
Bridgehead servers are the contact point for exchange of directory information between sites. When two sites are connected by a site link, the KCC automatically selects bridgehead servers. You can designate bridgehead servers manually; these are known as “preferred” bridgehead servers.
A connection object is an Active Directory object that represents an inbound-only connection to a domain free practice tests controller and is created automatically by the KCC. You can also create connection objects manually.
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