I`m reading the above link on Class C Classless IP Address and I`m finding it hard to understand how the subnet ID is made, from reading the page the pic shows me the subnet ID is made up from the first 3 bits of the IP address and the first 3 bits of the subnet mask.
128 64 32
0 0 0 - first 3 bits of IP
1 1 1 - first 3 bits of mask
If you take bits from the IP wont it change it ?
What do you have to do to make a subnet ID from the 6 bits?
Re: Subnet ID using host bits, i`m lost.
12 years 11 months ago #13139
The question I uderstand is what happens if you borrow 6 bits from a class c address???
please tell Me if I it was not the question.
I will answer anyway.
If you borrown 6 bits from the Host portion of a class C address it belong to a /30 mask, where you have 4 hosts, but only 2 are usable, for the rule that the first and the last are subnet Id and broadcast.