Subnetting - Help Please!

[KingE]

Okay, I am by no means a sub-netting guru. I learned the AND method many years ago and I have now read the Sub-netting Chapter in Todd's Book three times now.

However, when I practice sub-netting questions .... like from sunettingquestions.com...

I can answer the following questions no problem using the TL-method. Any questions that asks what is the valid host range, broadcast, etc., I can nail down quickly.

Question: What is the last valid host on the subnetwork 192.168.53.64 255.255.255.240?
Question: Which subnet does host 192.168.252.182/30 belong to?

The questions I need help on are the ones that ask about the amounts of subnets/hosts for a given networks.... like this:

Question: You are designing a subnet mask for the 10.0.0.0 network. You want 3600 subnets with up to 3400 hosts on each subnet. What subnet mask should you use?

Can someone provide some clarifications for me? What is a quick way to answer this question?

Thanks in advance.


Best regards,
Eric

[Pramod.purohit]

just find out number of subnet required with command power of 2. To find out number of subnet
2N
Where N is the number of bits taken from host portion. In your example you need 3600 subnets, if we take 8 bits from host portion for network ID it provides 256 subnet so we need more bits. if we take 12 bits from host portion it provides 4096 subnets. so it suits our requirement. we will choose a subnet mask of 255.255.240.0
Now we are left with 12 bits in host portion and it provides ( 2H -2 ) 4094 host in each subnet.

[KingE]

Okay, thanks for the explanation! That does help! I was going down the right path, just needed a bit more guidance....

[KingE]

Hey folks, I am now able to answer 99% of all questions on subnettingquestions.com in about 10-15 seconds - is this proficient enough for the CCENT?

Thanks - Eric

[Pramod.purohit]

Perfact Dude!! you are goood to go. keep on practicing