We pick i.root-servers.net, one of the 13 root servers (1), and ask it about wanhwan.com.tw and learn that tw is delegated to ten name servers (2), so we ask d.dns.tw where we learn that com.tw is delegated to seven name servers, including b.twnic.net.tw (3), so we ask that one and learn that wanhwan.com.tw is delegated to two name servers (4), so we ask dns2.ho.net.tw and get the following answer: