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The track for the people the helpdesk escalates to at 2am. Cisco IOS, BGP route flaps, OSPF adjacency drama, VLAN trunking, and reading a packet capture without flinching.
Each lesson is a 1-line briefing on what you'll practice. Read the briefing, then click Practice in terminal to drop into a real sandbox.
VLANs, trunking, port states, DHCP scope health. Most outages come from one cable, one config line, one stale ARP entry. Learn to spot which.
OSPF neighbor drama, BGP route policy, MTU/fragmentation, asymmetric paths that break NAT. The work the helpdesk escalates to you at 2am.
IPv6 rollouts, DDoS mitigation, cutover planning, packet capture archaeology. You design changes that survive a typhoon, not just a Monday.
The graded assessment uses the same terminal sandbox as these lessons : only it scores you on accuracy, methodology, tool fluency, communication, and real-world fit.