Subnet Masking, Valid Host Range, and why it matters!

Описание: Remember that the subnet is like an extension of the network, and is used to overcome the drawbacks of classful addressing by extending the available addresses within the network without having to switch to a different class.

The subnet id stays constant when you're trying to find the valid host range and so does the network id.

And all zeros and all ones cannot be used within a host range because all zeros would represent the subnet id, and all ones would represent the broadcasting address.


Edit: I made a mistake in this video, the /20 or /24 or /27
Whatever number it is, signifies the number of NETWORK bits, not the number of host bits. I missed this on my final exam, so hopefully you won't now!

Hopefully this clears up a few things! Enjoy ~