单词	distributed denial of service
释义	distributed denial of service noun phrase : an attempt to interfere with the normal operations of an online service (such as a website or app) by overwhelming it with repeated automated requests for data from multiple sources Although computer viruses, worms and other so-called malware can be countered with good security practices and up-to-date defensive software, distributed denial of service attacks are hard to protect against. John Schwartz A new distributed denial-of-service tool found recently in computers at several universities may be able to avoid defenses put up by Web sites … Jack McCarthy —abbreviation DDoS Word History First Known Use 1998, in the meaning defined above
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