Setup DNS Server using Bind 9 on CentOS 7

BIND is open source software that implements the Domain Name System (DNS) protocols for the Internet which provides ability to perform name to ip conversion. The name BIND stands for Berkeley Internet Name Domain, because the software originated in the early 1980s at the University of California at Berkeley. It is a reference implementation of DNS protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications.