DNS delegation of canais.uol.com.br updated: May 24, 2013 6:25:05 AM
Delegation
step
query
auth
servers
1
canais.uol.com.br.
.
(j,e,h,i,l,m,f,d,a,k,c,g,b).root-servers.net.
2
canais.uol.com.br.
br.
(f,c,e,a,d,b).dns.br.
3
canais.uol.com.br.
uol.com.br.
(eliot,borges,charles).uol.com.br.
4
conteudo.uol.com.br.
uol.com.br.
(charles,borges,eliot).uol.com.br.
We pick j.root-servers.net, one of the 13 root servers (1), and ask it about canais.uol.com.br and learn that br is delegated to six name servers (2), so we ask f.dns.br where we learn that uol.com.br is delegated to three name servers, including eliot.uol.com.br (3), so we ask that one where we see a CNAME from canais.uol.com.br to conteudo.uol.com.br, so we have to start all over again. We already know that charles.uol.com.br is authoritative for uol.com.br (4) and ask it about conteudo.uol.com.br and get the following answer: