In this example, the authoritative name server is shown in parentheses
at the point in the domain tree at which is assumes control.
Thus the root name servers are on C.ISI.EDU, SRI-NIC.ARPA, and
A.ISI.EDU. The MIL domain is served by SRI-NIC.ARPA and A.ISI.EDU. The
EDU domain is served by SRI-NIC.ARPA. and C.ISI.EDU. Note that servers
may have zones which are contiguous or disjoint. In this scenario,
C.ISI.EDU has contiguous zones at the root and EDU domains. A.ISI.EDU
has contiguous zones at the root and MIL domains, but also has a non-
contiguous zone at ISI.EDU.