Domain Name System (DNS) is a simple, yet extremely important, service that most of us take for granted. Namebench performs testing to find the fastest DNS servers for your particular computer or network. Test results show a DNS server from NTT was a whopping 1,794.1% faster than the ISPs default servers. Block access to other DNS servers to block inappropriate content from the network. Use DNS to protect your network from phishing sites, botnets and other security issues.”]
Source: https://www.csoonline.com/article/2875797/dns-tips-and-tricks.html