Free exam-focused coverage of networking concepts, operations, security, and troubleshooting for CompTIA Network+.
This section targets the current CompTIA Network+ exam series N10-009, which CompTIA identifies as version V9. The guide pages emphasize applied networking judgment: subnetting quickly, reading VLAN and trunk symptoms correctly, recognizing when DNS is the problem, and mapping a symptom to the right layer and tool before you chase the wrong cause.
Use the cheat sheet for fast recall of ports, protocols, subnetting, Wi-Fi, VLANs, and troubleshooting flow. Use the FAQ when you want more context around PBQs, study strategy, and common mistakes, and keep the resources page open when you need the official exam details, RFCs, or safe lab tooling.