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VLSM

topology.PNG

Subnet1.PNG

Hi all,

I need some direction into right path

They have given a topology and an example but i am confused with the ip address that how the ip address in the example came and what ip address and subnet mask do i use for this worksheet ahead like this one in the images. 

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VIP Mentor

there is a good view explain in dertailed :

 

https://www.youtube.com/watch?v=B90kYpnbKhY

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@balaji.bandiThank you for the video.

 

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Beginner

VLSM is very confusing.

What you need to do firstly is organize your subnets by size largest first

1,000,000

  500,000

  250,000  and etc

 

Then you need to work out how what power of 2 is just greater than 1,000,000

In the example above you can see it is 2^20 .

The 20 is significant because this is the number of Hosts bit you need for this subnet.

Your given base network is 100.80 /12 which looks like in binary

11111111.0101

 Subnet 0

2^20 -2 gives 1,048,574 hosts which is enough for 1,000,000 hosts

valid host addresses 11111111.01010000.00000000.00000001  to 11111111.01011111.11111111.11111110

Your next subnet add binary 1

11111111.0110

how many hosts?

need to find 2 power of just bigger than 500,000 which in this case is 2^19 =524,288 -2 = 524,286 which is enough for 500,000 hosts

 

Hope this helps you get on with it.

Peter

 

 

There are worlds out there where the sky is burning, where the sea's asleep and the rivers dream, people made of smoke and cities made of song. Somewhere there's danger, somewhere there's injustice and somewhere else the tea is getting cold" Dr Who
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Contributor

Good explanation

 

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