Paths
A guided order through the catalog. Pick a destination and solve the challenges in sequence; each one builds on the last, and every step still earns its own verified proof.
Routing fundamentals
From your first static route to BGP policy at the edge, in the order the skills build.
Subnetting and addressing
Carve blocks to fit, size each subnet to its host count, and summarize routes without over-advertising.
Switching and VLANs
Trunks, access ports, inter-VLAN routing, spanning tree, and link bundling, the layer-2 core.
Virtualization and VM networking
Wire VMs into bridges and VLANs on a single host, and keep tenants isolated at layer 2.
OSPF in depth
Adjacencies, passive interfaces, path cost, and redistribution, then diagnose a stuck neighbor.
Edge services: NAT, DHCP, and time
Put a LAN online through one public IP, publish a service, relay DHCP across subnets, and lock down time.
Network security basics
Lock down hosts, write real ACL policy, and finish by catching attacks in logs.
Cloud and IaC security
Least-privilege security groups, Kubernetes NetworkPolicy and pod security, and safer Terraform.
Linux host administration
Users and permissions, least-privilege sudo, defusing a SUID bug, log rotation, and service hardening.
Road to DevOps
From running one service properly to CI, containers, Kubernetes, and Terraform.
Automation and templating
Render device configs from data, then drive a multi-router OSPF rollout from one idempotent playbook.
Troubleshooting drills
Nine broken networks. Diagnose from symptoms to root cause, ending with a full outage.