Network administration encompasses the processes, techniques, and protocols used to configure, manage, and maintain computer networks. It involves managing network infrastructure through subnetting, routing, switching, VLANs, and various protocols to ensure efficient communication between devices. Core responsibilities include IP address allocation, routing protocol configuration, network segmentation for security and performance, and troubleshooting connectivity issues. Mastering these fundamentals allows administrators to build scalable, resilient networks while understanding that proper segmentation and routing design prevent broadcast storms, reduce collision domains, and enable controlled inter-network communication—a principle that underpins nearly every network topology decision you'll encounter.