[dns-operations] Acceptable query limit to root servers

[Wessels, Duane]

> On Jun 7, 2016, at 8:12 AM, Andrew White <andrew at vivalibre.com> wrote:
> 
> 
> We are considering adding some health checks on our recursive DNS platform.
> 
> We'd like to ensure each server has access to the root via a remote dig at the recursive server. Specifically we are considering a query to an effectively random top-level domain that should always be answered by an NXDOMAIN by a root server.

Out of curiosity, what is the motivation for such monitoring?  Have there been times where you apparently did not get responses from a root server?

DW