Binary and hexadecimal numbers are a complete mystery for many of us. Often we don't find it really interesting because on the internet there are plenty of "subnet" or "binary" calculators where you can easily calculate from decimal to binary to hexadecimal or the other way around, without knowing how the exact calculations works.
This is no problem when you are not configuring or designing networks on a daily basis, but it will be a problem as soon as you take a networking exam, so it's best to know how to do these calculations off the top of your head.
I find René Molenarr's subnetting tutorial (CCIE#41726) very interesting that you are free to download and discover the secret of subnetting. Once you have mastered the art of binary calculations you can immediately "see" how big a network is and what the subnet mask is when people start throwing numbers at you. The tutorial can be downloaded >> right here
I have been in networking for quite sometime now and i have noticed many people have trouble finding out what the subnet mask is, how many hosts are in a subnet, how to do summarization. Anyone working with networks on a professional level should be able to do binary calculations if ask me.
René Molenarr's subnetting tutorial teaches how to calculate subnets and subnet masks, how to calculate the numbers of hosts available ... etc. Download it >> right here
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