We have already said that if you “own” a domain, then, as such, you have the responsibility of ensuring that the data it contains is correct. You are the authority on that domain for the rest of us!
All this data is passed to the name servers through a series of files known as the “zone” files. This is the authoritative data for the domain.
So what is a zone? When a domain is small and doesn't contain any subdomains, it appears that the zone is simply another name for the domain—the zone files contain data about the domain. Unfortunately, it's not quite that simple, so let's look at an example to make it a little clearer.
Let's assume that we currently manage a domain named “bigcompany.com” and the company is growing from a small business ...