Configuring a Cisco IOS Router to act as a DNS Server

Have you ever had the need to have a quick DNS server at hand? - This is very useful when configuring UCCX 9.x and above in a lab environment with no DNS Server. At this point I’m not really sure if this DNS configuration will support more advanced configurations, like SRV records or anything of that nature, but I guess is a good start to begin testing it and see if there is more to it.