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83.
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Groups define a collection of computers or users which have a common level of access to particular network resources and offer a level of granularity in controlling access to such resources. For example, if a group <emphasis role="italic">qa</emphasis> is defined and contains the users <emphasis role="italic">freda</emphasis>, <emphasis role="italic">danika</emphasis>, and <emphasis role="italic">rob</emphasis> and a second group <emphasis role="italic">support</emphasis> is defined and consists of users <emphasis role="italic">danika</emphasis>, <emphasis role="italic">jeremy</emphasis>, and <emphasis role="italic">vincent</emphasis> then certain network resources configured to allow access by the <emphasis role="italic">qa</emphasis> group will subsequently enable access by freda, danika, and rob, but not jeremy or vincent. Since the user <emphasis role="italic">danika</emphasis> belongs to both the <emphasis role="italic">qa</emphasis> and <emphasis role="italic">support</emphasis> groups, she will be able to access resources configured for access by both groups, whereas all other users will have only access to resources explicitly allowing the group they are part of.
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