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In this paper, the authors examine the impact of DNS TTL values on the overall user experience in accessing a web site. They demonstrate that a web-site that utilizes inappropriate DNS TTL values could experience damaging and costly consequences, especially if falling victim to a DDoS attack. Subsequently, they represent the results of their survey that has looked into the DNS TTL values of the major US and EU banks. The results of this survey show that in the world of financial institutions, the level of assets and public exposure is highly correlated with the level of sophistication in DNS (Record) management.
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