DNS delegation of m.bol.com.br updated: May 22, 2013 9:23:00 AM
Delegation
step
query
auth
servers
1
m.bol.com.br.
.
(a,g,m,f,c,j,l,e,i,d,k,b,h).root-servers.net.
2
m.bol.com.br.
br.
(b,c,a,e,d,f).dns.br.
3
m.bol.com.br.
bol.com.br.
(eliot,charles,borges).uol.com.br.
4
m.canais.uol.com.br.
br.
(c,f,b,e,d,a).dns.br.
5
m.canais.uol.com.br.
uol.com.br.
(eliot,charles,borges).uol.com.br.
We pick a.root-servers.net, one of the 13 root servers (1), and ask it about m.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 m.bol.com.br to m.canais.uol.com.br, so we have to start all over again. We already know that c.dns.br is authoritative for br (4) and ask it about m.canais.uol.com.br and learn that uol.com.br is delegated to three name servers (5), so we ask eliot.uol.com.br and get the following answer: