We pick f.root-servers.net, one of the 13 root servers (1), and ask it about vidayfamilia.univision.com and learn that com is delegated to 13 name servers (2), so we ask f.gtld-servers.net where we learn that univision.com is delegated to five name servers, including ns04.savvis.net (3), so we ask that one where we see a CNAME from vidayfamilia.univision.com to www2.univision.com, so we have to start all over again. We already know that ns02.savvis.net is authoritative for univision.com (4) and ask it about www2.univision.com and get the following answer: