NS

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... Client NS for NS for thinkingcat.example example.com backup.em.example.com ...

... Client NS for NS for thinkingcat.example example.com backup.em.example.com | | | ...

... 1. The name server (NS) for thinkingcat.example is reached with a request for all NAPTR records. ...

... SRV records for that target, ultimately making the request of the NS for example.com. 4. The response includes the SRV records ...

... target (bigiron.example.com). 6. The example.com NS responds with an error message -- no such machine! ...

... A record with the IP address for backup.em.example.com from example.com's NS. 9. The client ...