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A systems administrator wants to harden a server. What would be the first effective approach?
Install antivirus
Remove unneeded services and disable unused ports
Configure firewall
Install IDS
EDIT: Surely a deny all rule in the firewall and then adding exceptions is better than removing un-needed services/ports? All would be effective. What would be the first thing in this list? EDIT 2: Since it is possible to tunnel communication through, overload the state tables of, and in other ways defeat a firewall one cannot depend on firewall rules alone, especially where switch ports are concerned.
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