Exercises

0 - network address
255 - Broadcast address
1 - 254 - valid IP

EXAMPLE
1. 192.3.2.2 - valid Class C
2. 211.255.254.2 - invalid (it because 255 is broadcast address)
3. 0.1.1.0 - invalid (It because 0 can't at 1st octac)
4. 7.4.5.1 - valid class A
5. 127.0.0.1 - invalid (It because 127 not in class)