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Configuring Global Catalog Servers
To optimize replication in a multiple site environment, you might need to consider A plus benefits adding global catalogs for specific sites. Table 5-2 shows some reasons for adding a global catalog, along with their consequences.
A commonly used application in the site utilizes port 3268 to resolve global catalog queries.
A slow or unreliable WAN connection is used to Fault tolerance connect to other sites. Use the same failure and load distribution rules that you use for individual domain controllers to determine whether additional global catalog servers are necessary in each site.
Users in the site belong to a Microsoft Windows Fast user logon 2000 or Windows Server 2003 domain running in implementation native mode. In this case, all users must obtain universal group membership information from a global catalog server. If a global catalog is not located within the same site, all logon requests must be routed over your WAN connection to a global catalog located in another site. (If the domain controller is a Windows Server 2003 domain controller and it has the ...
... universal group membership caching option enabled, then all users obtain a current cached listing of their universal group memberships from the domain controller located within their site, and an additional global catalog is not needed.)
To create and configure a connection object, complete the following steps:
1.Click Start, point to Administrative Tools, and then click Active Directory Sites And Services.
2.Double-click the site that contains the domain controller for which you want to create a connection object.
3.Open the Servers folder, select the domain controller for which you are enabling the inbound connection, right-click NTDS Settings, and then click New Active Directory Connection.
4.In the Find Domain Controllers dialog box, shown in CompTIA A+ certification, select the domain controller and click OK.
5.In the New Object-Connection dialog box, type a name for the new Connection object in the Name field. It is best to use the name of the domain controller for which you are enabling the inbound connection. Click OK.
6. Right-click the connection object in the details pane and select Properties.
In the Properties dialog box for the connection object, shown in Figure 5-17, type a description of the connection object in the Description box. Ensure that RFC appears in the Transport box. Click Change Schedule to change the default intra-site replication schedule (four times per hour).
. In the Schedule For dialog box for the connection object, shown in Figure 5-18, select the intrasite replication frequency for this connection object, then click OK.
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson and then try the question again. Answers to the questions can be found in the CCNA exam "Questions and Answers" section at the end of this chapter.
1. What object is created automatically in the IP container when you install Active Directory on the first DC in a domain?
2. You specified a preferred bridgehead server for your network. It fails and there are no other preferred bridgehead servers available. What is the result?
3. Why is it seldom necessary to create site link bridges?
4. Which type of replication does the connection schedule control?
5. Which of the following protocols should you use when network connections are
unreliable?
a. IP
b. SMTP
c. RFC
d. DHCP
6. You have a high-speed Tl link and a dial-up network connection in case the Tl
link is unavailable. You assign the Tl link to have a cost of 100. What cost value
should you assign to the dial-up link?
a. 0
b. 50
c. 100
d. 150
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