We pick g.root-servers.net, one of the 13 root servers (1), and ask it about www.smsmas.movistar.com.pe and learn that pe is delegated to three name servers (2), so we ask sns-pb.isc.org where we learn that movistar.com.pe is delegated to two name servers, including dns3.unired.net.pe (3), so we ask that one and get the following answer: