 3.       DNS                  163

Header   | OPCODE = SQUERY, RESPONSE, AA
Question   QNAME = SRI-NIC.ARPA., QCLASS = IN, QTYPE = MX
Answer    SRI-NIC.ARPA. 86400 IN MX 0 SRI-NIC.ARPA.
Authority   <empty>

Additional   SRI-NIC.ARPA. 86400 IN A   26.0.0.73
A   10.0.0.51

. 3.23.  DNS-      
  (  MX)     

Header  | OPCODE = SQUERY, RESPONSE, AA, RCODE = NE
Question   QNAME = SRI-NIC.ARPA., QCLASS = IN, QTYPE = A
Answer    <empty>

Authority   . SOA SRI-NIC.ARPA. HOSTMASTER.SRI-NIC.ARPA.
870611 1800 300 604800 86400

Additional  <empty>

. 3.24.  DNS-     
     

  QNAME=BRL.MIL, QTYPE=A   C.ISI.EDU. -
    ,   . 3.25.

Header   OPCODE = SQUERY, RESPONSE

Question   QNAME = BRL.MIL, QCLASS = IN, QTYPE = A

Answer    <empty>

Authority   MIL.       86400 IN NS SRI-NIC.ARPA.
86400    NS A.ISI.EDU.

Additional   A.ISI.EDU.            A  26.3.0.103
SRI-NIC.ARPA        A  26.0.0.73
A   10.0.0.51

. 3.25.  DNS-      -
       