How does this process start?

Every caching nameserver is seeded with a list of root servers
. 3600000 NS A.ROOT-SERVERS.NET. A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4 . 3600000 NS B.ROOT-SERVERS.NET. B.ROOT-SERVERS.NET. 3600000 A 128.9.0.107 . 3600000 NS C.ROOT-SERVERS.NET. C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12 ... etc
/etc/namedb/named.root
zone "." { type hint; file "named.root"; };
/etc/namedb/named.conf

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