We pick i.root-servers.net, one of the 13 root servers (1), and ask it about individuos.claro.com.ar and learn that ar is delegated to five name servers (2), so we ask ns2.switch.ch where we learn that claro.com.ar is delegated to two name servers, including nobelio.cti.com.ar (3), so we ask that one where we see a CNAME from individuos.claro.com.ar to firepass.claro.com.ar, so we have to start all over again. We already know that nobelio.cti.com.ar is authoritative for claro.com.ar (4) and ask it about firepass.claro.com.ar and get the following answer: