Question : moving dns help next step help

- we used to manage our own DNS servers for our address block
- we are now moving to a managed DNS service
- a zone transfer has been done, our records are now transferred and we've been assigned DNS servers that will be responsible for our domains.

question is: do we need to let the current ISP/ or registrar know that we are no longer managing our own DNS servers, that all queries should be pointed to our managed DNS service?

2.) If we wanted to have a secondary DNS server. The bulk of the configuration would be at the DNS server that we would want to be the secondary. The only thing we need to do on the primary is allow zone tranfers, is this correct?

Answer : moving dns help next step help

If your ISP is not providing primary or secondary DNS services for your zones, then no.

The world knows about your changes when you go to the registrar and change the NS records to identify the new authoritative servers.

When queries are made and the host information is not known locally, it traverses up the tree to the root servers which query the top level domain for the name servers responsible.

The real problem lies with the individual records within a zone and the time they are set to expire.  If all records in your zones are the same and you are simply changing the NS records at the registrar and your hosting provider is setup in advance with your zone information, then you should be good to go.

I've moved DNS a lot.  I typically keep the old DNS server in production for 15-30 days as a matter of principle (lots of times I'm also changing record information, though).