Subnetting in Binary

Lessons Discussion
23

Hi Rene/Laz,

Thank you for the Amazing materials and clarifications provided to your students. I am pursuing ENARSI but was just visiting subnetting to refresh.

Just wanted to point out a loosley worded sentence in ‘Class C’ subnetting which caused a bit of confusion for me.

You mentioned

“The answer is still no! I messed with your head because the highest value you can create with 8 bits is not 255 but 256. Why? Because you can also use a value of “0”.

This means we can use 192.168.1.1 – 192.168.1.254 as IP addresses for our hosts.”

While I get the concept you were trying to convey, I think the sentence could be worded differently.

Technically, 8bits can only produce a highest value of 255, the count from the lowest Value of ‘0’ to highest value ‘255’ gives us a total count of ‘256’ addresses for the range. As we have to deduct 2 addresses from this range ( one for the network portion and one for broadcast address), we will be left with 254 (= 256 - 2) usable host addresses.

Hope someone new could benefit from this :slight_smile:

24

Hello Jeffin

Thanks for your feedback, it’s always helpful to review and refine the content to ensure it is crystal clear to all our readers. I will let @ReneMolenaar know to consider rewording that section to make it clearer.

Thanks again, and I wish you success in your endeavors!

Laz