 3.       DNS____________143

 ( ,   ,   -
    ).

 $ INCLUDE          ( 
  ,     ).

D <RR>       :

[<TTL>] [<class>] <type> <RDATA>
[<class>] [<TTL>] <type> <RDATA>

D      TTL   .  , 
      ()    
 ,         
,     

       

1

  TTL    .     -
   ,    
, TTL    ,   
     

     

       "" -
 ISI.EDU.

NS      A.ISI.EDU.

NS      VAXA

MX      20   VAXA
A       A       26.3.0.103
VAXA    A       10.2.0.27

       128.9.0.33

$ INCLUDE <SUBSYS>ISI-MAILBOXES.TXT

  <SUBSYS>ISI-MAILBOXES.TXT  , ,
:

     MX      A.ISI.EDU.
LARRY   MX      A.ISI.EDU.
STOOGES MX      

MX      CURLEY

      IN   TTL,  -
 .       
XX.LCS.MIT.EDU,          
TTL = 17777.

XX.LCS.MIT.EDU. 17777   IN   A    10.0.0.44

17777   CH   A    MIT.EDU. 2420

