This increases security by lessening the risks associated with running a public DNS resolver, which include cache poisoning.
通过减少与运行一个公开DNS解析者相关的风险，包括缓存中毒，增加了安全。
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Another kind of attack on DNS systems is a "cache poisoning" attack, where the malicious hacker relies on flaws in some implementations of DNS to "hijack" domain names.