DNS delegation of pop.bol.com.br updated: May 18, 2013 8:13:02 PM
Delegation
step
query
auth
servers
1
pop.bol.com.br.
.
(d,f,l,h,j,m,a,e,b,i,c,g,k).root-servers.net.
2
pop.bol.com.br.
br.
(b,e,c,d,f,a).dns.br.
3
pop.bol.com.br.
bol.com.br.
(eliot,charles,borges).uol.com.br.
4
pop3.bol.com.br.
bol.com.br.
(eliot,charles,borges).uol.com.br.
We pick d.root-servers.net, one of the 13 root servers (1), and ask it about pop.bol.com.br and learn that br is delegated to six name servers (2), so we ask b.dns.br where we learn that bol.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 pop.bol.com.br to pop3.bol.com.br, so we have to start all over again. We already know that eliot.uol.com.br is authoritative for bol.com.br (4) and ask it about pop3.bol.com.br and get the following answer: