IPv4 Subnetting

While studying for the CCNA exam, at the time I was struggling with subnetting of IPv4 addresses and understanding how they arrive at the answer provided. I can now safely say that I have developed a method to master the subnetting without even working out the binary results.

Here we go:

1. We need to know the basic/ standard addressing scheme (classful):
   • Class A :                       1 – 126
   • Class B:                        128 – 191
   • Class C:                        192 – 223
   • Class D (multicast):  224 – 239
   • Class E (reserved):    240 – 255
2.  To be continued…..