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Nice blog post with a great summary on the topic:

“[…] Operate under the assumption that your network is compromised. Quit spending so much money trying to defend everything; that is like trying to put a fence around a national park. Focus on trouble areas, or those of the greatest concern, or that mean the most impact if something goes wrong. Quit thinking of your network as a castle, when the attacker has mortars and missiles. If you are losing the war, and losing most battles, at least try to protect your most valuable assets as best you can. […]”