48                         ___ ____________________ Internet

Protocol address space (16 ).     (
2048  IPv4).

LHA (8 ).       ( 6  Ethernet).

LPA (8 ).        ( 4
 IPv4).

Opcode (16 ).     ( 1  ,
Request  2     Reply).

   (Ethernet)   (IP)   
, , ,  LHA  LPA.

 RARP (Reverse ARP    ARP)    -
 ,   ARP.       
  Opcode. RARP   3  Request Reverse  4 
Reply Reverse.  RARP    ,
     ARP.  ,   -
       ""    
 ARP:

D ARP ,        IP-
  Ethernet.       
   .       -
    .

D RARP  ,      ()  
  IP-  Ethernet-     -
 .

 RARP     ,   -
    Ethernet   (   ,  
,   , )  
      IP,    
    .

  ,     
     RARP-   -
 Ethernet-    -
        .

    ARP  RARP : RFC-826,
RFC-903, RFC-1027.

     Ethernet

 Ethernet-      
 multicast-.,     
 Ethernet-,  Ethernet-  Internet-
    01-00-5-00-00-00  01-00-5E-7F-FF-FF.