[CentOS] OT Advantage of running DNS server?

Mon Jun 22 12:14:56 UTC 2015
Timothy Murphy <gayleard at eircom.net>

What is the advantage, if any, of running one's own DNS server?
Surely the link between domain name and IP address
must already have been established?

Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin