The correct answer is:
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The binary is the base 2 number system computers use for their calculations, including routing. Computers ‘think’ in binary. Memorizing or calculating the powers of 2 quickly is immensely helpful in being able to subnet quickly. This will save precious time on exams such as the CCNA and prove valuable in the real world.
The formula for how many valid hosts there are in any particular subnet is 2h-2.
Download our Subnet Cheat Sheet for all the essential information you need to perform subnet calculations in your head quickly.If you want to learn more about networking and get the Cisco CCNA certification, we highly recommend the Cisco CCNA Gold Bootcamp as your CCNA training course. The CCNA is by far the most in-demand networking certification by employers, and the Gold Bootcamp is the highest rated Cisco course online. It has an average rating of 4.8 from over 30,000 public reviews: