Architecting a DNS Design
After you complete your initial planning, you should consider an overall design architecture. There are two primary DNS designs used:
Split-Brain Design: Same Internal and External Names
Most DNS implementations are architected to use a split-brain design. What this means is that your organization uses the same domain name internally as it does externally, and DNS is designed so that the name services for your organization's internal network are separate from that used for the organization's external network. Put another way, an organization's private network should be private and separate from its presence on the public Internet, so your internal name servers should be separate from ...