7 Replies Latest reply: Jan 24, 2011 3:04 AM by Brian

Hi

Can anybody please explain the concept of Bit boundary and where it is applied/needed/takes part in networking?

I need a clear explanation for this because I have confusion in understanding the concept

Thanks & Regards

Swaminathan
• 1. Re: Confused about Bit Boundary

Hi Swam

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?

Regards Conwyn

• 2. Re: Confused about Bit Boundary

try this Wikipedia article. looks good:

http://en.wikipedia.org/wiki/Classful_network

1. Ability to subnet down classfull networks.

2. Classless networks.

3. VLSM

• 3. Re: Confused about Bit Boundary

what topic where bit boundry is confusing?

• 4. Re: Confused about Bit Boundary

Bit boundary is the invisible line between the network segment and the host segment.  Nothing special, just a "term" to use on a concept.

• 5. Re: Confused about Bit Boundary

I just saw this post and could not resist in replying.  Subnetting and binary math are some of my favorite topics.  Man I must be sick.

Enjoy the PDF file.

• 6. Re: Confused about Bit Boundary

Hi Mr.Brian

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

S.Swaminathan

N.B: Please give your contact number or mail id so that I can contact your for any further CCNA help

• 7. Re: Confused about Bit Boundary

Aloha Swaminathan,

No problem, glad I could help.  Also, glad you liked the PDF.  You can always find me on CLN or send me a private message.  Thanks again.

Brian