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DNS' openness leaves it vulnerable to a variety of denial of service techniques, from brute-force floods to sophisticated recursive attacks.
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Most experts agree that you can't do it all by yourself, but there are practical measures agencies can take to shore up their networks against denial of service attacks.
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Treating DOS attacks like a man-made disaster can help agencies determine the proper communication and technical response.
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Denial of service attacks on the Domain Name System are becoming common, but an effective defense will require a few rule changes.