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a question about VLSM

hello,

I have a confusing question about vlsm:

I have 4 networks:

1: 400 hosts
2: 200 hosts
3: 50 hosts
4: 50 hosts

The network given is 192.168.24.0/22

Don't you think this is a mistake? we cannot use 192.168.24.0/22 because we can't touch the network portion, am i right or wrong? but in fact a classe B IP address should be used, no?
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david875
Asked:
david875
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2 Solutions
 
Svet PaperovIT ManagerCommented:
Your network range is correct. You have a space for 1022 hosts.
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david875Author Commented:
so i can use the network 192.168.24.0 Mask 255.255.252.0 ? I didn't break any rule in vlsm, right?
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zakar1aCommented:
Yes, this is correct, since you use the class C address portion, 192.168.XXX.YYY (XXX & YYY) are the portion where you can manage your VLSM scheme so you can have something like this:

192.168.0.0/17
192.168.0.0/18
192.168.0.0/19
192.168.0.0/20
192.168.0.0/21
192.168.0.0/22
192.168.0.0/23
192.168.0.0/24
192.168.0.0/25
192.168.0.0/26
192.168.0.0/27
192.168.0.0/28
192.168.0.0/29
192.168.0.0/30
192.168.0.0/31
192.168.0.0/32

I'll let other experts confirm this.
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Svet PaperovIT ManagerCommented:
Come on guys! This is a basic CCNA stuff!

1st subnet: 192.168.24.0 / 23 or 255.255.254.0: you have 510 hosts
2nd subnet: 192.168.26.0 / 24 or 255.255.255.0: you have 254 hosts
3rd subnet: 192.168.27.0 / 26 or 255.255.255.192: you have 62 hosts
4rd subnet: 192.168.27.64 / 26 or 255.255.255.192: you have another 62 hosts

And you still have room for more subnets….

You can use a subnet calculator. There are many free on Internet but my favourite is Solarwind’s Advanced Subnet Calculator: http://www.solarwinds.com/products/freetools/free_subnet_calculator.aspx
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