I am a beginner in DNS service and I face difficult when configure DNS sub domain using "bind" version 8. So I would like to ask a question about this and hope someone can answer my question.
Is it possible to configure a sub domain in which the name of this sub domain is same as a server of it's parent domain? e.g. A sub domain "sub.example.com" is configured using a zone file and there is also a "A" record, "sub" in "example.com" zone file. If so, where should I place the "sub.example.com" to IP mapping, in "sub.example.com", "example.com" OR both?