Dear!
We are learning the operation of the DNS, we have find the document of Apnic *"The Root of the DNS"* ( <https://labs.apnic.net/presentations/store/2017-03-12-root-servers-explained.pdf>https://labs.apnic.net/presentations/store/2017-03-12-root-servers-explained.pdf , *slide:18 "Which Root!"*, document said that " *Which letter they pick is up to the resolver. Some do round robin, some latch on to the one they think is faster. There are no particular rules that resolvers use here. It’s not clear that resolvers use any particular heuristic to guide their choice of root server letter, nor is it clear that it matters in any case."* And we have already do lab, and then the DNS Cache work out of order, the DNS Root is choiced rondomly. We really wanna know "what is round robin of DNS" and the nature of the rule to choose the DNS Root of Resolver, what factor, algorithm, .... that decide the choice of DNS Root. Our final taget to want to know can we control the operation of the DNS Cache. Suppose that we have one Root Secondary Node of Anycast in our country (example DNS Root K), and we want to direct query of the DNS Cache to the that DNS Root, how can we interfere the resolve process to do that (unless otherwise configure only DNS Root K). What about round robin to choose with the top level domain, second level domain, ... ? Does the rule round robin depend on the DNS Software of DNS Cache (resolver) or DNS Root, DNS top level domain,....? Thanks!
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