Real world VLSM?

Hi guys

I'm studying for my CCENT and need a little help. I am struggling with the concept of VSLM. I know how it works and I can set it up but I am struggling to find out when it would be used in the real world other than to the ISP.

For example, if I had a 10 network VLAN and 200 guests by VLAN could ' t I just use the below?

192.168.1.0/24 VLAN 1

192.168.2.0/24 VLAN 2

etc.

I think small?

Can someone give me some real world examples of when to use VLSM and why?

Thanks in advance.

Yes, of course if you have 200 guests, you can go with the model you specified above. World real VLSM, I can give you a base case for both routers. R1 and R2 are connected together, no other host has access to this segment because they are directly related. It makes no sense using a set of 24, which is 251 host addresses will lose, imagine a large-scale network, with many routers from point to point. Hmm, a lot of waste!

So whereas we choose a 30, with only 2 host addresses, a subnet address and address of dissemination, and we can calve until our 24 or something else perhaps, more effectively.

Regarding the public IP (no RFC1918) some ISPS and company go with 31, no network address, no broadcast address. Just two addresses to host. It's how tight, we now for IPv4 address space.

Tags: Cisco Network

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