We pick m.root-servers.net, one of the 13 root servers (1), and ask it about secure-profile.facebook.com and learn that com is delegated to 13 name servers (2), so we ask j.gtld-servers.net where we learn that facebook.com is delegated to two name servers, including b.ns.facebook.com (3), so we ask that one where we see a CNAME from secure-profile.facebook.com to mi-reroute.fbcdn.net, so we have to start all over again. We pick c.root-servers.net, one of the 13 root servers (4), and ask it about mi-reroute.fbcdn.net and learn that net is delegated to 13 name servers (5), so we ask e.gtld-servers.net where we learn that fbcdn.net is delegated to two name servers, including b.ns.facebook.com (6), so we ask that one and see a second CNAME from mi-reroute.fbcdn.net to origincache-frc.fbcdn.net. We start over for the third time and we already know that a.ns.facebook.com is authoritative for fbcdn.net (7) and ask it about origincache-frc.fbcdn.net and see yet another CNAME from origincache-frc.fbcdn.net to origincache-frc.t.fbcdn.net. We have yet again to start all over and we already know that a.ns.facebook.com is authoritative for fbcdn.net (8) and ask it about origincache-frc.t.fbcdn.net and learn that t.fbcdn.net is delegated to two name servers (9), so we ask b.ns.t.fbcdn.net and get the following answer:
