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If you delete a GPO, it is removed from Active Directory, and any sites, domains, or OUs to which it is linked are no longer affected by it. You might wish to take the less drastic step of removing the GPO link, which disassociates the GPO from its OU but leaves the GPO intact in Active Directory. To delete a GPO, complete the following steps: 1. Open the Active Directory Users And Computers console to delete a GPO from a domain or OU, or open the Active Directory Sites And Services console to delete a GPO from a site. 2. In the console, right-click the site, domain, or OU from which the GPO should be deleted. Click Properties, and then click the Group Policy tab. 3. In the Properties dialog box for the object, in the Group Policy tab, select the GPO that you want to delete, and then click Delete. 4. In the Delete dialog box, click Remove The Link And Delete The Group Policy Object Permanently, and then click OK. The GPO is removed from Active Directory.

To edit a GPO or its settings, follow the procedures outlined earlier in this lesson for creating a GPO and for specifying Group Policy settings.

This chapter presents the skills and concepts related to creating a security design framework. This training kit assumes you have a minimum of 1 year of experience implementing and administering desktop operating systems and network operating system in environments that have the following characteristics:

@ActivationConfigProperty( propertyName="acknowledgeMode", propertyValue="Auto-acknowledge ")

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At least 250 supported users Three or more physical locations Typical network services such as messaging, database, file and print, proxy server or firewall, Internet and intranet, remote access, and client computer management Three or more domain controllers Connectivity needs, including connecting branch offices and individual users in remote locations to the corporate network and connecting corporate networks to the Internet

10

Two values can be specified for acknowledgment mode: Auto-acknowledge and Dupsok-acknowledge. Auto-acknowledge tells the container that it should send an acknowledgment to the JMS provider immediately after the message is given to an MDB instance to process. Dups-ok-acknowledge tells the container that it doesn t have to send the acknowledgment immediately; anytime after the message is given to the MDB instance will be fine. With Dups-ok-acknowledge, it s possible for the MDB container to delay acknowledgment for so long that the JMS provider assumes the message was not received and sends a duplicate message. Obviously, with Dups-ok-acknowledge, your MDBs must be able to handle duplicate messages correctly.

Each GPO is refreshed when you restart your computer. When you modify the settings in a GPO, they are refreshed every 90 minutes on a workstation or server and every five minutes on a domain controller. The settings are also refreshed every 16 hours, whether or not there are any changes. In Windows Server 2003, you can refresh policy immediately by using the Gpupdate command-line tool. Gpupdate replaces the secedit.exe /refreshpolicy command used for refreshing GPOs in Windows 2000. To refresh GPOs immediately, complete the following steps: 1. Click Start, and then click Run. 2. In the Run dialog box, type gpupdate in the Open box, and then click OK. You will briefly see the message Refreshing Policy on the command line while the policy is being refreshed. Gpupdate also permits certain options to be specified on the command line. You can learn more about these options by searching for gpupdate in Windows Server 2003 Help.

In addition, you should have experience designing a network infrastructure. Many design exercises are paper-based; however, to understand the technical capabil ities that a design can incorporate, you should have some hands-on experience with products. Where specific hands-on instruction is given, you must have at least two computers configured as specified in the Getting Started section at the beginning of this book.

The following are the best practices for implementing Group Policy:

The first step in designing access control for enterprise data is to understand the basic principles of access control in Microsoft Windows Server 2003 and how to use that structure to secure objects such as files, folders, and registry keys.

Disable unused parts of a GPO If a GPO has, under the User Configuration or Computer Configuration node of the console, only settings that are Not Config ured, disable the node to expedite startup and logging on. Use the Block Policy Inheritance and No Override features sparingly tine use of these feature makes it difficult to troubleshoot Group Policy. Rou

Auto-acknowledge avoids duplicate messages because the acknowledgment is sent immediately. Therefore, the JMS provider won t send a duplicate. Most MDBs use Autoacknowledge to avoid processing the same message twice. Dups-ok-acknowledge exists