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Question:

What feature can be used to restrict operating systems from accessing the network if they lack certain Windows Updates in a Windows Active Directory environment?

A Group Policy
Explaination

A Group Policy in Microsoft Active Directory is a policy that applies to a large number of AD objects. Objects include user accounts, servers, desktop devices, and so on. Group Policies may be used to enforce updates and prevent out-of-date workstations from accessing the domain until updates are performed.