 3.       DNS_____________159

ACC.ARPA.              26.6.0.65

HINFO   PDP-11/70 UNIX

MX      10 ACC.ARPA.
USC-ISIC.ARPA. CNAME   C.ISI.EDU.
73.0.0.26.IN-ADDR.ARPA. PTR    SRI-NIC.ARPA.
65.0.6.26.IN-ADDR.ARPA. PTR    ACC.ARPA.
51.0.0.10.IN-ADDR.ARPA. PTR    SRI-NIC.ARPA.
52.0.0.10.IN-ADDR.ARPA. PTR    C.ISI.EDU.
103.0.3.26.IN-ADDR.ARPA. PTR    A.ISI.EDU.
A.ISI.EDU. 86400 A      26.3.0.103
C.ISI.EDU. 86400 A      10.0.0.52

      .  ,
   SOA RR,    .  
       ,     -
 SOA RR   .    RR
NS    MIL  EDU,    -
 ""  (     ).

      RR: SOA, 
 ,   NS RR,     
 .   SOA RR   -
 .      SRI-NIC.ARPA,  
    HOSTMASTER@SRI-NIC.ARPA.  
    ,    -
 TTL-     MINIMUM (   86400
  1 ),  ,       -
   TTL  .

 NS RR  MIL  EDU    
   MIL  EDU.

 "^)

    ()    , -
     .

,     ,     -
  EDU:

EDU. IN SOA SRI-NIC.ARPA. HOSTMASTER.SRI-NIC.ARPA. (
870729 ;(serial)
1800   ;(refresh) 30 minutes
300    ;(retry) 5 minutes
604800 ;(expire)
86400 ;(minimum) of a day
)
NS SRI-NIC.ARPA.