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a question about VLSM


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

Don't you think this is a mistake? we cannot use 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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2 Solutions
Svet PaperovIT ManagerCommented:
Your network range is correct. You have a space for 1022 hosts.
david875Author Commented:
so i can use the network Mask ? I didn't break any rule in vlsm, right?
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:

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

1st subnet: / 23 or you have 510 hosts
2nd subnet: / 24 or you have 254 hosts
3rd subnet: / 26 or you have 62 hosts
4rd subnet: / 26 or 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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