Self Doubt

Question

While Subnetting, is it valid to buy bits from Network Id part ? Or Only we should buy bits from Host Id Part??

Please correct me if i am wrong.

Comments

in subnetting we take borrow from host portion .

and in supernetting we take borrow from network portion.

Answer 1

For subnetting  you should buy bit from network id only.

Comments

For class A ip address, we have 8 bits for Netwoork ID, but while creating SUBNET, we will keep these 8 bits as it is and then choose one of the bit from the host Id to create two subnets within the same network.

using the decimal octet representation,

let Ip address be 10.0.0.0,

we can create two subnet as,

10.0.0.0 and 10.128.0.0

created as,

10. 0 0 0 0 0 0 0 0 . 0. 0 and

10. 1 0 0 0 0 0 0 0 . 0 . 0.

In this we have used host part of the ip address.

Please correct me if i am wrong.

Answer 2

In subnetting,

We know that

SubnetID bits + NetID bits= Mask bits

eg:let we have subnet mask of 27 bits and we have given address of CLASS C i.e. 24bits . Also we know that Host ID bit will be of 8bit.

24+S=27

Then S=3

Now to make a subnet having 3bit we need to take 3bit from host ID bits...

We can see that NetID bits remains unaffected while host Id bits reduced

Hope u understands

Comments

Is the answer written by Junaid is correct? Im confusing here.

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Bro I don't think he is right..

Answer 3

In subnetting, we borrow bits from the host id or part.

And, In supernetting, we borrow bits from network id or part. I think, we are combining one or more networks together in supernetting.