Bits were very expensive in the old days so bits were collected into 4 then 6 and 8 and ...
By the time networking started there was 8 bits in a byte and so networking followed the convention.
An IP address is 32 bits or 4 bytes (technically called octet). They decided to define a classification which was self defining so the very first few bits indicate the nature of the network.
So first bit 0 then network class A. 8 bits for the network number (0-127) and the rest for the hosts. So the bit boundary falls on the 9th bit.
So first bits 10 B 16 16
11 C 24 8
Does that help?
try this Wikipedia article. looks good:
TCP/IP addressing evolved due to address depletion:
1. Ability to subnet down classfull networks.
2. Classless networks.
Thank you very much for your great explanation.
Wow ! Great explanation which cleared my confusion prevailing in my mind for the past years from the day beginning I started studying CCNA from 2006 .
Mind blowing explanation which is very clear to understand with examples .
Thanks a lot for your invaluable help and keep the spirit and your help is needed more in forthcoming chapters also for me
Thanks & Regards
N.B: Please give your contact number or mail id so that I can contact your for any further CCNA help