 2.   TCP/IP 47

1.  ARP-,     IP- 
Ethernet-.     ARP-.

2.   IP-  Ethernet-  IP-, -
  ,  ARP-.

3. Ethernet-    Ethernet.

       IP-,  ARP-   
    ARP-.  IP   IP-,
   .

^)

         Ethernet
      IP-.

  IP  ARP     IP-   ,
   ARP-.   IP-  , 
     TCP   ,
  UDP.     
-   .    
,        ARP-.

 ,      ARP- 
    (. 2.8).

16                24              31

Ethernet destination address ( 32 )
Ethernet dest. ( 16 )	Ethernet source ( 16 )
Ethernet source address ( 32 )
Type code	Hardware address space
Protocol address space	LHA	LPA
Opcode	 (Ethernet)
  (IP)    , , ,  LHA  LPA
Ethernet checksum

. 2.8.  ARP-

Type code (16 ).    .

Hardware address space (16 ).    ( 1  Ethernet,
Packet Radio Net).