To achieve that, these devices and services are required to have a unique address called - IP address.
In simple terms, we need subnets to communicate with every device and service available on that network. Hence, subnetting practice is - without a doubt - an essential part of your preparation for any basic Cisco examination. Majority of the questionnaire in CCNA belongs to subnetting.
The need to have solid understanding of subnets is at the very heart of successfully cracking the Cisco certification.