A+ tests broad IT knowledge across hardware, OS, and basic networking. Network+ goes deep on networking specifically — you need to understand how data actually moves across networks, how routing and switching decisions are made, and how to calculate subnets by hand. The troubleshooting scenarios are more complex and require systematic methodology rather than pattern-matching.
If you passed A+, you already have the foundation. Ports, protocols, the OSI model, and basic TCP/IP are review. The new material is subnetting, routing protocols, VLANs, WAN technologies, and network operations — give these areas the most time.
What the Network+ exam actually tests
N10-009 has five domains. The weighting tells you where to spend your study time — networking fundamentals and troubleshooting together make up over half the exam:
| Domain | Weight | What it covers |
|---|---|---|
| Networking Fundamentals | OSI model, ports and protocols, IP addressing, subnetting, routing concepts, switching, wireless standards | |
| Network Implementation | Routing protocols (OSPF, BGP, RIP), VLANs, switching features, wireless implementation, cloud networking | |
| Network Operations | Monitoring, documentation, network policies, disaster recovery, high availability, remote access | |
| Network Security | Firewalls, IDS/IPS, VPNs, network hardening, physical security, common attacks and defences | |
| Network Troubleshooting | Troubleshooting methodology, cable issues, connectivity problems, performance issues, tools (ping, tracert, nslookup, netstat) |
The one topic that fails most candidates — subnetting
Subnetting is the make-or-break topic on Network+. It's not optional, it can't be guessed, and it appears in multiple questions including performance-based questions where you have to calculate subnet ranges, usable hosts, and broadcast addresses under time pressure.
The good news is subnetting is completely learnable with the right approach. The bad news is most candidates underestimate how much practice it takes to do it quickly and accurately under exam conditions. Reading about subnetting is not enough — you need to do hundreds of practice problems until the pattern is automatic.
Learn the /24 to /32 range first — these are the most commonly tested. Know the subnet mask, number of subnets, and usable hosts for each prefix length without having to calculate from scratch.
Practice daily, not in marathon sessions. 15–20 subnetting problems every day for 4 weeks builds fluency faster than doing 100 problems on one weekend. Speed comes from repetition, not understanding alone.
A free resource worth bookmarking: subnettingpractice.com — unlimited randomised problems with instant feedback.
How long does it take to study for Network+?
The study plan that works
Start with the OSI model and TCP/IP fundamentals — even if you covered these for A+, review them with Network+ depth in mind. Then spend the majority of this phase on subnetting. Don't move on until you can calculate subnet ranges, usable hosts, and broadcast addresses consistently and quickly.
This phase covers the content that's most different from A+. Routing protocols, VLANs, and switching concepts require understanding how network decisions are made — not just memorising names. Use diagrams and draw out network topologies as you study; visualising traffic flow accelerates understanding.
The security domain on Network+ is broader than many candidates expect — not just firewalls and VPNs but also network hardening, attack types, and physical security. The troubleshooting domain requires internalising a systematic methodology: identify the problem, establish a theory, test the theory, implement the solution, verify, and document.
Stop reading new material and switch entirely to practice exams. Take full 90-question timed tests under real conditions. For every wrong answer, understand not just what the right answer is but why — Network+ scenarios often have two plausible answers and the reasoning matters more than the answer itself.
Exam day tips
Underestimating subnetting. Candidates who can explain subnetting conceptually but can't calculate quickly under time pressure run out of time on PBQs and lose points they would have had. Subnetting speed comes only from repetitive practice — there's no shortcut.
The second most common reason: skipping the troubleshooting methodology. CompTIA's 7-step process is directly tested and scenario questions specifically ask for the correct first, second, or next step. Memorise the order: identify the problem → establish a theory → test the theory → establish a plan → implement → verify → document.
Ready to start studying for Network+?
The best N10-009 study guide, practice exams, and Professor Messer's free course.