 2.   TCP/IP 37

    .      
210.20.30.0  210.20.30.63,   210.20.30.64  210.20.30.127  
 210.20.30.192  210.30.20.255.     255.255.255.192.

 ^)

     Internet       R,
        IP-  210.20.30.1 
210.20.30.253,      Internet 210.20.30.254   
255.255.255.0.

        (, .
, D, , G).   ,   0.0.0.0    
,         
   (   " -
"  default gateway).

 :

Network Address Netmask Gateway Interface

0.0.0.0
210.20.30.0

0.0.0.0
255.255.255.192

210.20.30.10
210.20.30.1

210.20.30.1
210.20.30.1

    ,   ,     
   ,    .   
   R.

 Q:

Network Address	Netmask	Gateway	Interface
0.0.0.0 210.20.30.0	0.0.0.0 255.255.255.192	210.20.30.10 210.20.30.2	210.20.30.2 210.20.30.2

 R:

Network Address	Netmask	Gateway	Interface
0.0.0.0 210.20.30.0 210.20.30.64 210.20.30.192	0.0.0.0 255.255.255.192 255.255.255.192 255.255.255.192	210.20.30.254 210.20.30.10 210.20.30.70 210.20.30.200	210.20.30.200 210.2Q.30.10 210.20.30.70 210.20.30.200

 R    ""   
   Internet.