I’m teaching our trainees how to find out Subnets by mental arithmetic as they need it for School.
This is the way I learned how to.
First we where told to learn and write this chart before the Exams:
This chart is been calculated so :
I just learned for MS Exams Subnet Mask /20 - /32. But the trainees must learn /8 - /32. I think this chart can be easily continued till /8. I also told them to lean the power of 2 (till 12). Is this the easiest way? Alternatively, do you have any other better mnemonic’s?
Many thanks in advance