network

C-class
[ 192.168.0.0/24 ]
NNNNNNNN - NNNNNNNN - NNNNNNNN - HHHHHHHH
2개로 분할(2^n = 2, 따라서 n은 1)
NNNNNNNN - NNNNNNNN - NNNNNNNN - NHHHHHHH
1. NNNNNNNN - NNNNNNNN - NNNNNNNN - 0HHHHHHH
   [1] Range: NNNNNNNN - NNNNNNNN - NNNNNNNN - 00000000
    ~ NNNNNNNN - NNNNNNNN - NNNNNNNN - 01111111
      192.168.0.0 ~ 192.168.0.127
   [2] Network Address  : 192.168.0.0
   [3] Host Address     : 192.168.0.1 ~ 192.168.0.126
   [4] Broadcast Address:  192.168.0.127
   [5] Subnet Mask     :  255.255.255.128 
   PC-PT PC0 -> 192.168.0.1
   PC-PT PC1 -> 192.168.0.2
   PC-PT PC2 -> 192.168.0.3
   GATEWAY: 192.168.0.126  
2. NNNNNNNN - NNNNNNNN - NNNNNNNN - 1HHHHHHH
   [1] Range: NNNNNNNN - NNNNNNNN - NNNNNNNN - 10000000
    ~ NNNNNNNN - NNNNNNNN - NNNNNNNN - 11111111
      192.168.0.128 ~ 192.168.0.255
   [2] Network Address  : 192.168.0.128
   [3] Host Address     : 192.168.0.129 ~ 192.168.0.254
   [4] Broadcast Address:  192.168.0.255
   [5] Subnet Mask     :  255.255.255.128
   PC-PT PC3 -> 192.168.0.129
   PC-PT PC4 -> 192.168.0.130
   PC-PT PC5 -> 192.168.0.131
   GATEWAY: 192.168.0.254

[ping xxx.xxx.xxx.xxx]