152                                                                Internet

     (  ),  -
  "*".   "*"  , , -
    QNAME    CNAME.
      . . 
 "*" ,   QTYPE.   RR 
 QTYPE   .    6.

4.   .  QNAME ,   RR
  QTYPE   .    6.

5..         
(  ).       ,
   CNAME.

6.    ,    -
  RR (,   ) 
  . .

   

        
  ,       .
         
      .   -
       FTP,   -
   ,    DNS .

       
,        (master)   .
     (slave)    -
       .

    ,   -
     (   ). 
,        
,  (   ) 
          (
     ).

       SERIAL
 SOA   .      ,
 SERIAL  SOA  .     -
,          -
   (master file).  SERIAL    -
   ,      ,  
    .

      -
   RR SOA  REFRESH, RETRY, EXPIRE.