Lets wind down on the subnetting with a few questions. 

I hope you are giving yourself a break.  Remember that I teach this stuff now and can subnet in my head mostly but there was a time I was sitting in a dingy rented hotel room crying because I couldn't understand how to subnet.  It had been six weeks of reading and I wanted to pass the exam so I could get a job back home and see my wife and daughter because I had to work away all week.

I have two words written on cards on the top of my monitor, 'Patience' and 'Faith.'  It will come with time so just let it sink in.

Here are your questions Paul.  You know what do to by now:

Which subnet are the below hosts in?

192.168.1.221/29

10.23.45.115/20

170.45.22.111/22

12.34.99.1/10

You have the below network address and you need to create 14 subnets each having 14 hosts per subnet.  Which mask will give you that:

192.168.1.0

That is the end of the e-course Paul, well done for completing it, you should be very proud of yourself.

If you want to take your subnetting to another level I really commend you to invest in Subnetting Secrets.  After completing that course you will never fear another subnetting question. 

If you fancy yourself as a Cisco engineer then please visit http://www.howtonetwork.net because Subnetting Secrets is given away to every member.

All the best and happy subnetting.