Information Technology Reference
In-Depth Information
Subnets
192.168.1.0
192.168.2.0
192.168.3.0
Subnet
192.168.4.0
Slow WAN link
DC 1
DC 2
4
Coolgadgets.com Chicago site
Coolgadgets.com New Orleans site
Figure 4-18
Sites and subnets
Sites and connections between sites are defined by a number of components that can be created
and configured in Active Directory Sites and Services. They include subnets, site links, and
bridgehead servers, discussed in the following sections.
Subnets
As discussed, each site is associated with one or more IP subnets. In short, an
IP subnet is a range of IP addresses that a group of computers share. All computers assigned
an address in the subnet can communicate with one another without requiring a router. By
default, no subnets are created in Active Directory Sites and Services. When a new site is cre-
ated, all subnets used by the default site should be created and associated with the default
site. Then the subnets for the new site should be created and associated with the new site.
Figure 4-19 shows Active Directory Sites and Services with the Default-First-Site-Name
Properties dialog box open.
Figure 4-19
The Default-First-Site-Name Properties dialog box
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