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Inheritance can be reinstated in two ways: from the child resource or from the parent folder. The results differ slightly. You might reinstate inheritance on a resource if you disallowed inheritance accidentally or if business requirements have changed. Simply reselect the Allow Inheritable Permissions option in the Advanced Security Settings dialog box. Inheritable permissions from the parent will now apply to the resource. All explicit permissions you assigned to the resource remain, however. The resulting ACL is a combination of the explicit permissions, which you might choose to remove, and the inherited permissions. Because of this dynamic, you might not see some inherited permissions in the first or third ACL editor dialog boxes. For example, if a resource has an explicit permission, Allows Sales Reps Read & Execute, and the parent folder has the same permission, when you choose to allow inheritance on the child, the result will be that the child has both an inherited and an explicit permission. You will see a check mark in the first and third dialog boxes; the explicit permission obscures the inherited permission in the interface. But the inherited permission is actually present, which can be confirmed in the second dialog box, Advanced Security Settings.
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The second method for reinstating inheritance is from the parent folder. In the Advanced Security Settings dialog box of a folder, you may select the check box, Replace Permission Entries On All Child Objects With Entries Shown Here That Apply To Child Objects. The result: all ACLs on subfolders and files are removed. The permissions on the parent are applied. You can think of this as blasting down the parent s permissions. After applying this option, any explicit permission that had been applied to subfolders and files is removed, unlike the method used for reinstating inheritance on the child resources. Inheritance is restored, so any changes to the parent-folder ACL are propagated to its subfolders and files. At this point you are able to set new, explicit permissions on subfolders or files. The Replace Permissions option does its job when you apply it, but does not continuously enforce parent permissions.
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It is common for users to belong to more than one group and for those groups to have varying levels of resource access. When an ACL contains multiple entries, you must be able to evaluate the permissions that apply to a user based on his or her group memberships. The resulting permissions are called effective permissions.
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Effective permissions are a common exam objective on most of the Microsoft Windows Server 2003 core exams, as well as on design and client exams. Pay close attention to this information and to any practice questions regarding effective permissions so you can be certain you have mastered the topic.
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Understanding Effective Permissions
The rules that determine effective permissions are as follows:
File permissions override folder permissions. This isn t really a rule, but it is often presented that way in documentation, so it is worth addressing. Each resource maintains an ACL that is solely responsible for determining resource access. Although entries on that ACL might appear because they are inherited from a parent folder, they are nevertheless entries on that resource s ACL. The security subsystem does not consult the parent folder to determine access at all. So you might interpret this rule as: The only ACL that matters is the ACL on the resource. Allow permissions are cumulative. Your level of resource access might be determined by permissions assigned to one or more groups to which you belong. The Allow permissions that are assigned to any of the user, group, or computer IDs in your security access token will apply to you, so your effective permissions are fundamentally the sum of those Allow permissions. If the Sales Reps group is allowed Read & Execute and Write permissions to a folder, and the Sales Managers group is allowed Read & Execute and Delete permissions, a user who belongs to
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