Everything mapped to the CCNA 200-301 blueprint. Articles tagged CCNA cover the exam topics in the order you actually learn them, each one backed by a lab you can build yourself.
Three DHCP and NAT troubleshooting tickets on the five-node CCNA base topology. Each one fails quietly until you read the one counter or interface flag that gives it away. All output captured on Cisco IOS XE in CML Free.
Three OSPF troubleshooting tickets that drill the key distinction: an adjacency that never forms versus a healthy adjacency with a missing prefix. Runs on the five-node base topology in CML Free, with real IOS XE output.
Two hosts on the same subnet, both interfaces up, no reachability: the fault is one layer down. Three switching and VLAN troubleshooting tickets on the five-node CCNA topology, with every output captured from a real IOS XE switch.
You inherit a broken network and a ticket that describes a symptom, nothing else. This free preview lab teaches the L1/L2/L3 fault localization method the CCNA tests hardest, on the five-node CML Free topology.