Active Directory Sites: Overview

In this video, James Conrad covers the basics of Active Directory sites. This overview explains why sites are useful for prudent network utilization and why this is necessary even when you have high-speed WANs at your disposal. James further goes into significant detail on how to configure your Active Directory sites.

After watching this video, you will understand why Active Directory helps facilitate prudent network utilization. James further details why your setup should mirror how your Exchange sites route mail, and how you can use sites for things such as DFS, domain controller authorization and other tasks that are site-aware. James also delves into the details of configuring Active Directory sites. This includes topics such as renaming the default first site name, creating sites that mirror geographical sites and plopping your domain controllers into sites. Other topics include creating subnets associated with the sites, checking replication and configuring cost and schedules.

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[zelllers]

How is a domain computer supposed to know to go through one site to get to another site based on site link cost. I don't understand, isn't that the job of layer 3 protocols? What purpose does this have this is what routers are best at...?