DNS delegation of avd.jbs.com.br updated: May 25, 2013 8:57:45 AM
Delegation
step
query
auth
servers
1
avd.jbs.com.br.
.
(m,b,e,h,d,f,g,k,i,j,l,c,a).root-servers.net.
2
avd.jbs.com.br.
br.
(e,a,f,c,b,d).dns.br.
3
avd.jbs.com.br.
jbs.com.br.
(ns2,ns1).jbs.com.br.
4
app.jbs.com.br.
jbs.com.br.
(ns2,ns1).jbs.com.br.
We pick m.root-servers.net, one of the 13 root servers (1), and ask it about avd.jbs.com.br and learn that br is delegated to six name servers (2), so we ask e.dns.br where we learn that jbs.com.br is delegated to two name servers, including ns2.jbs.com.br (3), so we ask that one where we see a CNAME from avd.jbs.com.br to app.jbs.com.br, so we have to start all over again. We already know that ns2.jbs.com.br is authoritative for jbs.com.br (4) and ask it about app.jbs.com.br and get the following answer: