| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a technique for finding the failure of name resolution by a DNS server quickly.SOLUTION: A determination device includes a domain name acquisition unit for acquiring the domain name which failed name resolution from a history storage unit storing the history of name resolution of domain name, a domain name determination unit for determining whether or not the domain name acquisition unit has succeeded name resolution of domain name acquired, before failing name resolution of domain name acquired, and an output unit for outputting a domain name when a determination is made that the domain name determination unit has succeeded name resolution of domain name.</p> |
