162_________________________________________ Internet

         ,  
    SRI-NIC.ARPA,   
(. 3.21  3.22):

Header   | OPCODE = SQUERY, RESPONSE
Question   QNAME = SRI-NIC.ARPA., QCLASS = IN, QTYPE = *

Answer     SRI-NIC.ARPA. 12345 IN A 26.0.0.73
A 10.0.0.51

Authority   <empty>
Additional   <empty>

. 3.21.  DNS-      
  ,    ,   
 

Header  | OPCODE = SQUERY, RESPONSE

Question   QNAME = SRI-NIC.ARPA., QCLASS = IN, QTYPE = *

Answer    SRI-NIC.ARPA. 1290 IN HINFO DEC-2060 TOPS20

Authority   <empty>

Additional   <empty>

. 3.22.  DNS-     
    ,    ,  
  

     .  ,    
  TTL,   ,     -
            
 QTYPE=A,      HINFO.

  QNAME=SRI-NIC.ARPA, QTYPE=MX.  
        . 
 C.ISI.EDU  ,    . 3.23.

   MX RR.  ,   
     .

  QNAME=SIR-NIC.ARPA, QTYPE=A,   -
    .   C.ISI.EDU  ,  -
  . 3.24.

 ,      (   
RCODE).    SOA,    Authority -
,   ,   ,      SOA
  86400       .