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Domain Name Service is a distributed database system that is used to map:
Correct Answer: A
Explanation/Reference: The Domain Name Service is a distributed database system that is used to map domain names to IP addresses and IP addresses to domain names. The Domain Name System is maintained by a distributed database system, which uses the client-server model. The nodes of this database are the name servers. Each domain has at least one authoritative DNS server that publishes information about that domain and the name servers of any domains subordinate to it. The top of the hierarchy is served by the root nameservers, the servers to query when looking up (resolving) a TLD. Reference(s) used for this question: KRUTZ, Ronald L & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 100. and https://en.wikipedia.org/wiki/Domain_Name_System