We pick l.root-servers.net, one of the 13 root servers (1), and ask it about emispendik.kemenag.go.id and learn that id is delegated to four name servers (2), so we ask sec3.apnic.net where we learn that kemenag.go.id is delegated to two name servers, including dns2.kemenag.go.id (3), so we ask that one and get the following answer: