Which authorization model could be ideal, Computer Network Security

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Question:

(a) Your office administrator is being trained to take server backups. Which authorization model could be ideal for this situation: MAC, DAC or RBAC? Justify your answer.

(b) If an employee is fired, what should you do as an information security specialist?

brians.
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bob1965.
123abc.

(d) State whether the following statements are TRUE or FALSE. Justify your answer.

i. A user's effective permissions can be inherited from multiple groups.

ii. Kerberos provides one-way authentication only i.e. only client is authenticated

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