DNS delegation of www.yahoomai.com updated: May 24, 2013 5:50:40 AM
Delegation
step
query
auth
servers
1
www.yahoomai.com.
.
(a,k,c,g,f,i,b,e,j,d,l,m,h).root-servers.net.
2
www.yahoomai.com.
com.
(d,g,j,m,f,h,k,i,e,b,c,l,a).gtld-servers.net.
3
www.yahoomai.com.
yahoomai.com.
(ns2,ns4,ns1,ns5,ns3).yahoo.com.
4
rc.yahoo.com.
com.
(m,g,j,h,f,b,l,e,i,d,c,k,a).gtld-servers.net.
5
rc.yahoo.com.
yahoo.com.
(ns3,ns2,ns1,ns5,ns4).yahoo.com.
6
rc.g01.yahoodns.net.
.
(g,b,h,e,f,d,i,c,j,a,m,k,l).root-servers.net.
7
rc.g01.yahoodns.net.
net.
(e,b,h,j,l,d,f,i,m,c,g,k,a).gtld-servers.net.
8
rc.g01.yahoodns.net.
yahoodns.net.
(ns1,ns2,ns3,ns5,ns4).yahoo.com.
9
rc.g01.yahoodns.net.
g01.yahoodns.net.
(yf8,yf7,yf4,yf3,yf5,yf6,yf2,yf1).yahoo.com.
10
any-rc.a01.yahoodns.net.
yahoodns.net.
(ns3,ns2,ns1,ns5,ns4).yahoo.com.
11
any-rc.a01.yahoodns.net.
a01.yahoodns.net.
(yf1,yf2).yahoo.com.
We pick a.root-servers.net, one of the 13 root servers (1), and ask it about www.yahoomai.com and learn that com is delegated to 13 name servers (2), so we ask d.gtld-servers.net where we learn that yahoomai.com is delegated to five name servers, including ns2.yahoo.com (3), so we ask that one where we see a CNAME from www.yahoomai.com to rc.yahoo.com, so we have to start all over again. We already know that m.gtld-servers.net is authoritative for com (4) and ask it about rc.yahoo.com and learn that yahoo.com is delegated to five name servers (5), so we ask ns3.yahoo.com and see a second CNAME from rc.yahoo.com to rc.g01.yahoodns.net. We start over for the third time and we pick g.root-servers.net, one of the 13 root servers (6), and ask it about rc.g01.yahoodns.net and learn that net is delegated to 13 name servers (7), so we ask e.gtld-servers.net where we learn that yahoodns.net is delegated to five name servers, including ns1.yahoo.com (8), so we ask that one and learn that g01.yahoodns.net is delegated to eight name servers (9), so we ask yf8.yahoo.com and see yet another CNAME from rc.g01.yahoodns.net to any-rc.a01.yahoodns.net. We have yet again to start all over and we already know that ns3.yahoo.com is authoritative for yahoodns.net (10) and ask it about any-rc.a01.yahoodns.net and learn that a01.yahoodns.net is delegated to two name servers (11), so we ask yf1.yahoo.com and get the following answer:
