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Configuring Sites and Managing Replication
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Figure 5-4 New Object Site dialog box
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4. In the Active Directory message box, shown in Figure 5-5, note that to finish the configuration of a site, you must
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Ensure that the site is linked to other sites with site links as appropriate. Add subnets for the site to the Subnets container. Install one or more domain controllers in the site or move existing domain controllers into the site. Select the licensing computer for the site.
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Figure 5-5 Active Directory message box
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5. Click OK.
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Lesson 2
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To rename a site, complete the following steps: 1. Click Start, point to Administrative Tools, and then click Active Directory Sites And Services. 2. Click the Sites folder. 3. Right-click the site you want to rename, and then click Rename. 4. Type the new site name over the existing site name. Click in an empty part of the console tree.
Creating Subnets
Computers on TCP/IP networks are assigned to sites based on their location in a subnet or a set of subnets. Subnet information is used to find a domain controller in the same site as the computer that is authenticated during the logon process, and is used during Active Directory replication to determine the best routes between domain controllers. Subnets must be defined in Active Directory to ensure accurate and efficient directory replication and resource usage. Each site must have at least one subnet, but a subnet can be assigned to only one site. When you create a subnet, you must specify the subnet address and mask. Then you must assign the subnet to a specific site. A subnet name is automatically assigned based on the subnet address you entered and the number of subnet mask bits you specified in the subnet mask. For example, if you specify a subnet address of 192.168.16.0 and a subnet mask of 255.255.255.0, the subnet name assigned is 192.168.16.0/24. To create a subnet, complete the following steps: 1. Click Start, point to Administrative Tools, and then click Active Directory Sites And Services. 2. Double-click the Sites folder. 3. Right-click the Subnets folder, and then click New Subnet. 4. In the New Object Subnet dialog box, shown in Figure 5-6, type the subnet address in the Address box. In the Mask box, type the subnet mask that describes the range of addresses included in this site s subnet. Choose a site to associate this subnet, and then click OK.
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Configuring Sites and Managing Replication
Figure 5-6 New Object Subnet dialog box
To associate an existing subnet with a site, complete the following steps: 1. Click Start, point to Administrative Tools, and then click Active Directory Sites And Services. 2. Open the Subnets folder, and then click the subnet. 3. Right-click the subnet, and then click Properties. 4. In the Properties dialog box for the subnet, shown in Figure 5-7, select a site with which to associate this subnet from the choices available in the Site list, and then click OK.
Figure 5-7 Properties dialog box for a subnet
Lesson 2
Configuring Sites
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Creating, Moving, and Removing Domain Controller Objects in a Site
As discussed earlier in this lesson, when you install Active Directory on the first domain controller in a domain, a site object named Default-First-Site-Name is automatically cre ated in the Sites container and the first domain controller for the domain is installed into this site. Subsequent domain controllers are installed either into the site of the source domain controller (assuming the IP address maps to the site) or into an existing site. Domain controllers might also need to be demoted. Therefore, it is often neces sary to create, move, or remove domain controller objects in a site. However, you must first consider the location of domain controllers for each site.
Determining the Location of Domain Controllers
For optimum network response time and application availability, place at least
One domain controller in each site A domain controller in each site provides users with a local computer that can service query requests for their domain over LAN connections. Two domain controllers in each domain By placing at least two domain controllers in each domain, you provide redundancy and reduce the load on the exist ing domain controller in the domain. Recall that a domain controller can service only one domain.
Note When a single site includes multiple domains, you cannot place a domain controller in the site and expect it to service more than one domain.
Reasons for placing additional domain controllers in a site are the following:
There are a large number of users in the site, and the link to the site is slow or near capacity. If a site has slow logon times and slow authentication when attempting to access user resources, capacity might be insufficient. By monitoring domain controller usage, you can determine whether there is enough processing power and bandwidth to service requests. If performance is lagging, you should consider adding another domain controller to the site. The link to the site is historically unreliable or only intermittently unavailable. If a single domain controller in a site fails, clients can connect to other domain controllers in other sites in the domain by crossing site links. However, if site links are unreliable, users on that site may not be able to log on to their computers. In this case, you should consider adding another domain controller to the site.
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