Eventually this process will either:

Find an authoritative nameserver which knows the answer (positive or negative)
Not find any working nameserver: SERVFAIL
End up at a faulty nameserver - either cannot answer and no further delegation, or wrong answer!

(Note: the caching nameserver may happen also to be an authoritative nameserver for the query. In that case it can answer immediately without asking anywhere else. We will talk later why it's a good idea to have separate machines for caching and authoritative nameservers)

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