In the world of networking, there used to be two main approaches: classful and classless. Initially, the internet relied on Classful networks, which divided IP addresses into three classes: A, B, and C. However, this system didn't distribute addresses efficiently. To accommodate the internet's rapid growth, a more flexible method called Classless Inter-Domain Routing (CIDR) was introduced. Unlike classful networks, CIDR doesn't rely on predefined classes and allows for a more efficient allocation of IP addresses.
In our previous discussion, we delved into the world of IP addresses, the numerical labels that uniquely identify devices on a network.