How much bandwidth would 2 nameservers use?

Question

I'm in need of 2 branded nameservers for my clients' domains. Couldn't find any information about that, but how much bandwidth and bandwidth speed would I need for those two DNS servers "just in general"? Say, I got 100 domains, some of them quite popular, some of them not at all. Can't say how much DNS queries those would "eat" because this is a total nightmare for me - counting numbers when you don't know how to count them. Thanks for any information.

Answer 1

This is a very broad question to answer, but here's a good starting point to look at (Assuming that you're going Windows)

Keep in mind that for typical usage, the DNS server consumes system memory as follows: Approximately 4 MB of RAM is used when the DNS server is started without any zones.

For each addition of zones or resource records to the server, the DNS server consumes additional server memory.

It is estimated that for the addition of every resource record to a server zone, an average of approximately 100 bytes of server memory is used.

For example, if a zone containing 1000 resource records is added to a server, it would require approximately 100 KB (kilobytes) of server memory.

https://technet.microsoft.com/en-us/library/cc781502(v=ws.10).aspx