Networking guides.

From first principles to 15-second subnetting. Binary fluency, VLSM, summarization and 200 speed-drills with an answer-verification method that catches your own errors.

Campus, data center and WAN reference architectures — hierarchical design, redundancy models, QoS and the trade-off language used by senior network engineers.

Why the internet's routing protocol suddenly matters in cloud careers — peering, path selection, hybrid connectivity and the failure modes that take down regions.

Netmiko, NAPALM, RESTCONF and Ansible — with templates that turn 200-line change windows into 20-line playbooks. Includes a lab topology to practice against safely.