CompTIA Network+ Study Guide: What to Learn and In What Order

Network+ is the certification that turns you from someone who plugs cables in until the light goes green into someone who understands why the light went green. The current exam, N10-009, is up to 90 questions in 90 minutes, a mix of multiple choice and performance based questions, scored 100 to 900 with 720 to pass. No prerequisites, though most people take it after A+ or a year of help desk work, and that is the right order: Network+ assumes you already speak basic computer.

How the exam is weighted

Five domains: networking concepts at 23 percent, network implementation at 20, network operations at 19, network security at 14, and network troubleshooting at 24. Read that list again and notice the exam's opinion: troubleshooting is the single heaviest domain. This is not a trivia test about protocols. It is a test of whether you can find the broken thing.

The topics that decide pass or fail

• ›Subnetting. Not because there are dozens of subnetting questions, but because IP addressing turns up inside several domains, from concepts through implementation and troubleshooting. If you can carve a /24 into four subnets and say how many usable hosts each one has without a calculator, a whole category of questions becomes free points.
• ›Ports and protocols, cold. SSH on 22, DNS on 53, HTTP and HTTPS on 80 and 443, RDP on 3389, DHCP on 67 and 68, NTP on 123. These are pure memorization and the exam asks them straight. Losing points here is losing points you already paid for.
• ›The OSI model as a tool, not a poem. Reciting the seven layers is worthless. Using them is the whole game: a user cannot reach a website, so you check physical link, then IP configuration, then DNS, then the application, in order, and the exam writes questions exactly along that path.
• ›Wireless fundamentals. Channels, bands, interference, and why 2.4 GHz through three walls is the problem even though the access point shows four bars.
• ›Reading output. You will be shown the result of commands like ping, traceroute, ipconfig, and nslookup and asked what is wrong. If you have never watched a traceroute die at hop three, watch one before exam day.

A study order that builds

Networking knowledge stacks, so study it in stack order. Weeks one and two: addressing and the OSI model, until subnetting is arithmetic instead of algebra. Weeks three and four: how networks are actually built, switching, routing, VLANs, wireless, and the hardware that does it. Week five: operations and security, which is mostly vocabulary and best practice riding on top of what you now understand. Week six onward: troubleshooting scenarios daily, timed, in exam format, reviewing every miss until the reason is obvious. The troubleshooting domain is the biggest and it is also the one practice moves fastest, because it is a skill, not a fact.

Techunique is an independent practice tool, not affiliated with CompTIA. Use it to sharpen, book the real exam through Pearson VUE, and walk in having already found the broken thing a hundred times.