1. A deep dive into DNS query failures;Yang,2020
2. Domain names–concepts and facilities, RFC 882;Mockapetris,1983
3. Domain names–Implementation and specification, RFC 883;Mockapetris,1983
4. Domain names–concepts and facilities, RFC 1034;Mockapetris,1987
5. Domain names–Implementation and specification, RFC 1035;Mockapetris,1987