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  1. By creating and maintaining a master list of the world’s URLs, DNS testing tools can measure the server’s real-world response to both valid and invalid queries. A good DNS test device will be able to assess queries sent, completed, and lost, track response codes, and measure latency in query response time.
    www.apposite-tech.com/testing-dns-server-perform…
    What is a DNS test? A DNS server test is used to find out which DNS a device is using at any given time.
    You can check a computer or router to see what your DNS servers should be, but the pages below show what they actually are (with the tested web browser). That is, they report the DNS servers your current browser is actually using. We need tests like these because there are many places that DNS servers could have come from.
    www.routersecurity.org/testdns.php
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