We pick k.root-servers.net, one of the 13 root servers (1), and ask it about outerspace.terra.com.br and learn that br is delegated to six name servers (2), so we ask c.dns.br where we learn that terra.com.br is delegated to four name servers, including b.dns.terra.com.br (3), so we ask that one where we see a CNAME from outerspace.terra.com.br to vip-wcache-sao.terra.com.br, so we have to start all over again. We already know that b.dns.terra.com.br is authoritative for terra.com.br (4) and ask it about vip-wcache-sao.terra.com.br and get the following answer: