Before we dive into subnetting, it's essential to understand IP addresses and subnet masks.
solves this by allowing you to subnet an already subnetted network. This lets you apply different masks ( /24 , /28 , /30 ) within the same larger network infrastructure. The Golden Rule of VLSM: ip subnetting from zero to guru pdf
Traditionally, IP addresses were divided into classes (A, B, C, D, E) based on the value in the first octet. However, modern networking uses , which allows for more flexible subnetting. CIDR uses a prefix notation (like /24) to indicate how many bits are in the network portion of the address. For example, a /24 CIDR prefix corresponds to a subnet mask of 255.255.255.0 and provides 256 total IP addresses, with 254 usable for hosts. Before we dive into subnetting, it's essential to