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Secondary DNS is useful if your primary dns server went down or too busy to serve request
Thanks for your replies, the above is what I'm interested in. How does this system work exactly? Say I have three nameservers, two from my host and one from my domain provider (secondary DNS). If my host's two servers are unreachable does that mean that browsers will try each one in turn, from 1 to 3, and take the first one that replies? Or do they check any at random?. If one fails, do they try another on the list?