When you are studying for any networking-exam like Microsoft's, Cisco or from any other vendor it's useful that you know how to perform binary and subnetting calculations.

Also for work it might be very useful to know how to create the correct summarizations and to see in the blink of an eye what the broadcast address, network address and the number of hosts of a given ip+subnetmask is.

To make your life easier I decided to create an eBook which explains you exactly how to do it and i'll teach you my strategy how to solve these questions fast...off the top of your head!

I'm inviting you to take a look at this page.