The need to have solid understanding of
subnets is at the very heart of successfully cracking the Cisco certification. Majority of the
questionnaire in CCNA belongs to subnetting. Hence, subnetting practice is – without a doubt – an
essential part of your preparation for any basic Cisco examination.
In simple terms, we need subnets to
communicate with every device and service available on that network. To achieve that, these devices and
services are required to have a unique address called – IP address. An IP address not just assigns a
unique identification number to every machine on a network, but it also provides a mechanism for
different devices and services to communicate with each other.
An IP address is composed of a network,
subnet and the host bits. Every new subnet is created by borrowing the final bit from the network part of
an IP address. And when we subnet a network, we categorize it into unique coherent groups, known as the
hosts. An IP address assigns bits to those subnets and carries them in its host section. Having different
subnets for different items in the same network allows us to create many hosts having unique access
Therefore, subnetting practice is very much
required when preparing for the CCNA exam. To crack the exam, passing marks of 825 out of 1000 are needed
which becomes even more difficult to score when we have a stringent time limit that we are given. So, you
need to have a thorough understanding of subnetting to finish your exam in time. Hence, I advise you to
prepare well for this topic because it is the most time consuming part of the exam especially if you are
slow at calculations.
Nevertheless, you don't have to be a genius
in math’s to learn subnetting because it is more of the concept rather than a mathematical problem, but
you should learn to calculate it accurately and quickly. Once you get the hold of the concept then you
can easily solve different subnetting question in a far less amount of
Below is the practice questions based
on different Subnetting Classes. I have especially designed these questions to help prepare for
subnetting in the best possible way. Practicing these questions will improve your subnetting skills, so
begin now! And don't forget to check your answers after you solve them (answers
Important: If your concepts are not clear
yet then you should check subnetting examples first.