 2.   TCP/IP___________________________61_

 TCP.   ,  
TCP,   FTP (File Transfer Protocol,   -
).       FTP/TCP/I P/ENET.  -
  UDP (User Datagram Protocol,  
)       
UDP. , SNMP (Simple Network Management Protocol, 
  )    UDP. 
   : SNMP/UDP/IP/ENET.

          -
    .  ,    
       .  -
,        -
       
 .    .

 TCP, UDP   Ethernet    n x 1.
  ,      
.      1  .  -
,           -
        . 
Ethernet-      Ethernet,  
     ARP,    IP. (  
   ,     Ethernet-).

 IP-    IP,      
    TCP,  UDP,   
"Protocol"   IP-.  TCP-   
TCP,    ,     -
,      ""   TCP-
.

      
,          . -
       ,  
 ,  ,  .

       -
   . TCP    ,  
  ,   ,    
    . ,  ,  -
          ,
   , ,   HTTP, FTP,
SMTP  .,  ,        -
 ,    . , Internet
,     ,    
,    80,    
   WWW.