Variable-Length Subnet Masks

Hi,

I was reading about variable length subnet masks on one of the presentations from one site and I came across this particular site which contained some statements I was unable to understand.

The site was explaining about various possible VLSM assignments.

The slide had following content.
I would be very thankful if someone could explain how these assignments are carried out.


Title: Use Of Address Space (Start With 16 Bits Of Host Suffix)

One possible VLSM assignment (92.9% of addresses used)

11 networks of 2046 hosts each

24 networks of 254 hosts each

256 networks of 126 hosts each

Another possible VLSM assignment (93.1% of addresses
used)

9 networks of 2046 hosts each

2 networks of 1022 hosts each

40 networks of 510 hosts each

160 networks of 126 hosts each

Thanks...

Ping

VLSM is a word for not using classfull subnets.

the 10.0.0.0/8 is a classful subnet, when using VLSM (that is variable length subnet masks) you can for example split the 10.0.0.0/8 up in multiple networks.


10.1.0.0/16
10.2.0.0/16
10.3.0.0/24
10.3.1.0/24

etc. This way you can make your networks smaller (or larger when supernetting) and adjust it to your needs.

Hope this sheds a bit of light

Hi Ping,

On Which Class Address they want to apply those VLSM e.g A, B, or C, so that you will able to know the answer precisely.

Rizin

Thank You Chojin, the issues is clear now..

rizin, in the example I was reading it was referring to class B addresses..

thanks ping and it is sounding great that your issues had got cleared.