What is it?
Subnetting is the process of dividing networks into smaller parts for security, organization, and logical grouping.
Why is important
Subnetting provides IPv4 network addressing for all systems on a network even though the available addresses in IPv4 have long since been exhausted.
Understanding subnetting’s role in segmentation and configuration makes it easier to work with and understand networking and network security topics in a greater capacity.
Subnetting is vital to configuring firewalls, Network Address Translation and Access Control Lists
Proficiency in subnetting will make understanding, designing and troubleshooting network topologies intuitive .