Subnetting - please explain w/ demo.

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Hi

I have read loads of articles about subnetting and I seem to grasp it, then when I need to answer a question about it; everything just falls out of my head. I think it's because I don't have any scenarios to match it to (I learn best by example):

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1. 5 networks (max users on network = 16). Which of the following masks will provide a subnet for each department, while making enough usable host addresses?

a) 255.255.255.128
b) 255.255.255.192
c) 255.255.255.224
d) 255.255.255.240
e) 255.255.255.248
f) 255.255.255.252

2. You have a large 172.12.0.0 network that you want to divide into subnets. Each subnet must support 459 users; you must provide the MAXIMUM amount of subnets available. Which mask would you use:

a) 255.255.0.0
b) 255.255.128.0
c) 255.255.224.0
d) 255.255.254.0

3. You have been provided with a subnet mask of 255.255.255.254. You want to assign IP addresses to hosts on the subnet. Which of the following IPs would you use? (choose three)

a) 16.23.118.63
b) 87.45.16.159
c) 92.11.178.93
d) 134.178.18.56
e) 192.168.16.87
f) 217.168.166.192.
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I realise that subnetting is horrible and would be most indebted to anyone who can take these question to 'formula' and explain each answer thoroughly and concisely. Assume that I have no knowledge of networking or subnetting

 

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Rather than noodle through the answers, I'm going to provide a few resources. You've probably already seen a subnetting chart that looks something like this:

http://www.pantz.org/networking/tcpip/subnetchart.shtml

However, the next link pretty much single-handedly taught me to subnet well enough to pass the CCNA. You can also purchase the content on CD for a nominal fee. It should contain everything you need to teach you how to subnet. There is other useful content here as well. Enjoy.

http://www.learntcpip.com/LTSN/default.htm

BTW, Welcome to CertForums. Please take a few moments and pop up to the New Members Introduction forum and tell us a little bit about yourself. Cheers.