What four types of name servers can we add to a zone?

• A. Grid Primary; Grid Secondary; External Primary; External Secondary
• B. Primary, Secondary, Caching, Forwarding
• C. Root, Local, Authoritative, Recursive
• D. Internal Primary, Internal Secondary, External Primary, External Secondary

Answer: (A)

In Infoblox DNS, a zone can delegate to four kinds of name servers: Grid Primary, Grid Secondary, External Primary, and External Secondary. Grid Primary and Grid Secondary are authoritative servers that reside within the Infoblox Grid and hold/replicate the zone data inside the grid, providing internal redundancy. External Primary and External Secondary are authoritative servers located outside the grid that you can delegate to, enabling integration with external DNS infrastructure while still controlling delegation from within the grid. This setup gives you both internal grid resilience and external reach as needed. The other options mix in resolver roles (like caching/forwarding) or use nonstandard terminology, which don’t represent the actual four deployment options for a zone in Infoblox.