CompTIA Network+ (N10-009) Study Guide: Format, Domains, Cost, and How to Pass

CompTIA Network+ (N10-009) is a vendor-neutral certification that validates the skills needed to design, configure, manage, and troubleshoot wired and wireless networks. The exam gives you up to 90 questions in 90 minutes, mixes multiple-choice with hands-on performance-based questions (PBQs), and requires a scaled score of 720 out of 900 to pass. There are no formal prerequisites, though CompTIA recommends A+ certification and 9–12 months of networking experience. Passing comes down to three things: knowing the five exam domains in proportion to their weight, practicing PBQ-style tasks before exam day, and drilling enough realistic questions that the real exam feels familiar rather than surprising.

This guide covers the exam format, every domain and its weight, how scoring actually works, a practice-first study plan you can run in four to eight weeks, and the specific mistakes that sink first-time candidates.

Who Network+ is for

Network+ sits one rung above CompTIA A+ on the infrastructure ladder. A+ proves you can support endpoints; Network+ proves you understand the network those endpoints live on — addressing, routing, switching, wireless, security fundamentals, and structured troubleshooting.

The certification maps well to roles like network support specialist, junior network administrator, help desk tier 2, NOC (network operations center) technician, and field service technician. It is also a common stepping stone: Security+ assumes you already understand networking at roughly the Network+ level, so many candidates take the two back-to-back.

You do not need A+ first. CompTIA recommends it, and the recommendation is honest — if you have never worked a support role, some troubleshooting scenarios will feel abstract — but plenty of candidates pass Network+ as their first certification. What matters more than a prior cert is whether you have touched real equipment or lab environments. If you have configured a home router, set up a small office network, or worked through virtual labs, you have the experiential base the exam assumes.

What the Network+ exam looks like

Here are the verified exam facts for N10-009:

Detail	N10-009
Number of questions	Maximum of 90
Question types	Multiple-choice and performance-based questions (PBQs)
Time limit	90 minutes
Score scale	100–900
Passing score	720
Exam voucher cost	$399 USD (raised in the May 2026 CompTIA price change)
Prerequisites	None required; A+ and 9–12 months of networking experience recommended
Certification validity	3 years, renewable through CompTIA Continuing Education (CE)

A few points deserve emphasis.

“Up to 90 questions” means your count may vary. CompTIA does not publish a fixed count, and candidates report anywhere from the high 70s to 90. Budget your time as if you will see 90.

PBQs usually front-load the exam. Performance-based questions are interactive items — you might drag connector types onto ports, configure a SOHO (small office/home office) router interface, place devices on a network diagram, or work through a simulated command-line output. They typically appear as the first several items, they take far longer than multiple-choice questions, and they are worth more. How you handle them determines whether you finish the exam comfortably or in a panic; the scoring section below covers the right strategy.

90 minutes is tighter than it sounds. With 90 questions, you average one minute per question — but PBQs can eat five to ten minutes each. The arithmetic only works if you move briskly through the multiple-choice items and refuse to stall on any single question.

The three-year clock starts when you pass. Network+ is valid for three years and renews through CompTIA’s CE program — earning CEUs (continuing education units) through activities like training, higher-level certifications, or work experience documentation. Passing a higher CompTIA exam (such as Security+) automatically renews Network+.

The five N10-009 domains

N10-009 organizes its objectives into five domains. The weights tell you exactly how to allocate study time:

#	Domain	Weight
1	Networking Concepts	23%
2	Network Implementation	20%
3	Network Operations	19%
4	Network Security	14%
5	Network Troubleshooting	24%

Domain 1: Networking Concepts (23%). The theoretical foundation: the OSI (Open Systems Interconnection) model and what happens at each layer, TCP/IP, common ports and protocols, IPv4 and IPv6 addressing, subnetting, network topologies, traffic types, and modern infrastructure concepts including cloud connectivity and virtualization. N10-009 expanded the modern-infrastructure coverage — expect questions on software-defined networking, zero trust architecture, and how network functions virtualization compares with containers and virtual machines. This domain rewards genuine understanding over memorization: the exam asks you to apply the OSI model to diagnose problems, not just recite the layers.

Domain 2: Network Implementation (20%). Making networks work: routing technologies (static routes, OSPF, BGP concepts), switching features (VLANs, trunking, Spanning Tree Protocol, port aggregation), wireless deployment, and physical installation factors. The wireless objectives are substantial — channels and bands, 802.11 standards and their capabilities, antenna selection, and access point placement all live here.

Domain 3: Network Operations (19%). Keeping networks healthy: documentation (network diagrams, IP address management, rack diagrams), monitoring with SNMP (Simple Network Management Protocol) and flow data, disaster recovery concepts (RPO, RTO, high-availability designs), DHCP and DNS operations, and remote access methods, including split-tunnel versus full-tunnel VPN (virtual private network) configurations and client-based versus clientless VPN access.

Domain 4: Network Security (14%). The lightest domain by weight but a dense one: logical security (encryption, IAM concepts, network access control), physical security, common attacks (VLAN hopping, on-path attacks, DNS poisoning, rogue access points and evil twins), wireless security protocols, and defense features like ACLs (access control lists), screened subnets, and network segmentation for compliance requirements such as PCI DSS. Even though it is only 14%, security thinking bleeds into scenario questions across every other domain.

Domain 5: Network Troubleshooting (24%). The heaviest domain on the exam. It covers the CompTIA troubleshooting methodology (identify the problem, establish a theory, test it, plan and implement a solution, verify, document), cable and physical-layer issues, common network service problems, wireless-specific issues, and the software tools (ping, traceroute, nslookup/dig, nmap, protocol analyzers) and hardware tools (cable testers, toner probes, optical power meters) used to diagnose them. Nearly a quarter of your exam is troubleshooting scenarios — treat this domain as a first-class study priority, not an afterthought.

A study plan that works

The single most reliable predictor of passing is the volume of realistic practice questions you work through and review. Reading builds familiarity; answering questions builds the recall and discrimination the exam actually measures. The plan below is practice-first: you start answering questions in week one, not after you have “finished studying.”

Total timeline: four weeks if you are studying near-full-time or have real networking experience; eight weeks at roughly an hour a day from a cold start.

Phase 1 — Baseline and foundations (week 1)

Take a diagnostic practice set covering all five domains before you study anything. The score does not matter; the per-domain breakdown does. Most candidates discover their weaknesses are not where they expected — commonly subnetting, wireless, and troubleshooting methodology.

Then build the Domain 1 foundation: OSI model with real protocol examples at each layer, the port-and-protocol table, and IPv4 addressing. Start subnetting practice now — ten minutes daily, every day, for the entire plan. Subnetting is a skill, not a fact; it only becomes fast through repetition, and exam time pressure punishes anyone who has to reason it out from scratch.

Phase 2 — Implementation and wireless (weeks 2–3)

Work through routing and switching: VLANs, trunk ports, STP, static versus dynamic routing. Lab these if you can — packet-tracer-style simulators or a pair of cheap managed switches make VLAN concepts concrete in a way reading never will.

Give wireless its own dedicated block. It spans Domains 2, 4, and 5, and it is where memorization-only candidates get hurt, because the exam tests behavior — what actually happens on the air — rather than spec-sheet trivia. Work through the material in this order:

1. Standards and bands. Know how the 802.11 generations differ in band support, throughput, and features, and the practical trade-offs between 2.4 GHz and 5 GHz channels — range versus speed, overlap versus clean channels, and which non-overlapping channels exist in each band.
2. Radio behavior. Understand channel bonding and why wider channels are a mixed blessing, how MU-MIMO (multi-user multiple input, multiple output) and beamforming improve efficiency, and how signal strength in dBm relates to real-world performance.
3. Physical design. Learn the antenna types and their radiation patterns, how gain and polarization affect coverage, and why a wireless site survey precedes any serious deployment.
4. Wireless problems. Study the common interference sources, co-channel interference and airtime contention, and the diagnostic reasoning behind intermittent wireless disconnects. These map directly to Domain 5 scenarios.

Keep the daily subnetting reps going, and keep answering domain-tagged practice questions as you finish each topic — immediate retrieval practice roughly doubles retention compared with re-reading.

Phase 3 — Operations and security (weeks 4–5)

Cover monitoring (SNMP versions, syslog severity levels, flow protocols), documentation types, DHCP/DNS operations, and availability concepts (RPO/RTO, active-active versus active-passive). For remote access, be able to articulate when an organization would choose split tunneling over a full tunnel and what trade-offs each carries.

For security, prioritize the topics the exam tests through scenarios: WEP through WPA3 and what each protocol actually fixed, authentication concepts (802.1X, RADIUS, MAC-based fallback), attack recognition — especially rogue APs versus evil twins, which the exam loves to make you distinguish — and detection technology: where IDS and IPS sensors sit in a network and why placement changes what they can do, plus how their detection methods differ and how tuning reduces false positives.

Phase 4 — Troubleshooting and full simulation (weeks 6–8, or the final week of a fast track)

Memorize the seven-step troubleshooting methodology cold — the exam tests the order of steps. Drill tool-selection questions: given a symptom, which command or hardware tool comes first?

Then shift almost entirely to full-length, timed practice exams. The rules that make these useful:

• Simulate real conditions. 90 questions, 90 minutes, no pausing, no looking anything up. The point is to train pacing, not just knowledge.
• Review every question — including the ones you got right. A correct guess is a gap. For each miss, write down the concept (not the question) and restudy it.
• Track per-domain scores. You are ready when you are consistently scoring 85%+ overall with no domain below 80%. The pass mark of 720 does not translate cleanly to a percentage, so build margin rather than aiming to scrape by.
• Include PBQ-style practice. If your practice platform has performance-based items, do them under time pressure. The exam-day difference between a candidate who has done twenty PBQs and one who is seeing the format for the first time is enormous.

How the exam is scored

Network+ uses scaled scoring: your raw performance is converted to a scale of 100–900, and you need 720 to pass. Because the scale is not a percentage, “720 out of 900” does not mean “80% correct” — the conversion accounts for question difficulty and form differences, and CompTIA does not publish the mapping. Practically, this means you should ignore attempts to reverse-engineer “how many I can miss” and simply build a comfortable margin in practice.

Two scoring facts should shape your exam-day behavior:

There is no penalty for guessing — an unanswered question is scored the same as a wrong one. Never leave anything blank. If time is running out, answer everything, even at random. Every blank is a guaranteed zero; every guess has a chance.

PBQs are worth more than multiple-choice items but are not all-or-nothing traps you must conquer immediately. The winning strategy is skip-and-return: when the PBQs appear at the start of your exam, give each one a few focused minutes. If a PBQ is not yielding, flag it, move on, and clear the entire multiple-choice section first. Multiple-choice questions are fast points; banking them guarantees the bulk of your score. Then return to flagged PBQs with whatever time remains and a calmer head. Many PBQs also award partial credit, so completing part of a simulation is far better than abandoning it — and infinitely better than burning twenty minutes on one item while thirty unanswered multiple-choice questions expire.

Results are calculated immediately: you learn whether you passed before you leave the testing seat.

Common mistakes that fail first-timers

1. Avoiding subnetting. It is the most-skipped topic and one of the most-tested skills. Candidates tell themselves they will “just miss those questions” — but subnetting logic also underlies addressing, VLSM, and troubleshooting scenarios, so the real cost is much larger than a few direct questions. The fix is boring and effective: ten minutes of subnetting drills daily until you can find the network address, broadcast address, and host range for any CIDR (Classless Inter-Domain Routing) notation in under thirty seconds.

2. Memorizing ports without context. Knowing “443 = HTTPS” earns nothing if you cannot recognize when a scenario is describing a blocked secure-web connection, or which port to open on a firewall for a described service. Study ports as scenario cues: for each protocol, know what problem it solves, whether it is secure or plaintext, and what its secure replacement is (Telnet→SSH, HTTP→HTTPS, FTP→SFTP/FTPS, SNMPv2c→SNMPv3).

3. Never practicing PBQs. Candidates who have only done multiple-choice practice open the exam, hit a simulation on question one, and lose both time and composure. Even a handful of PBQ-style exercises beforehand removes the shock and teaches you what “good enough, flag it, move on” feels like.

4. Skipping timed full-length simulation. Untimed practice builds knowledge but not pacing. The 90-in-90 format punishes candidates who linger; if your first experience of exam-length time pressure is the real exam, your last twenty questions will be rushed guesses. Run at least two or three full timed exams before test day.

5. Underweighting wireless and troubleshooting. Add them up: Network Troubleshooting is 24% and wireless content threads through Implementation, Security, and Troubleshooting. Together they dominate the exam, yet many candidates spend most of their time on the more “textbook” Domain 1 material because it is easier to study from notes. If your practice scores are weakest in troubleshooting scenarios or wireless behavior, that is where your remaining hours belong.

6. Studying to recognize instead of recall. Re-reading notes and watching videos produces familiarity — everything “looks known.” The exam demands retrieval under pressure. If most of your study time is consumption rather than answering questions from memory, your practice scores will lag your confidence, and the exam will feel much harder than your study sessions did.

Exam-day logistics

You can take N10-009 two ways, both through Pearson VUE:

In person at a Pearson VUE test center. Arrive at least 15 minutes early with two forms of identification — the primary must be a government-issued photo ID with a signature. Personal items, phones, watches, and notes go in a locker. You get an erasable note board or equivalent for scratch work (useful for subnetting).

Online proctored from home. You will run a system check beforehand, show your ID to a remote proctor via webcam, and pan your camera around the room to prove the workspace is clear. Requirements are strict: a private room, an empty desk, no second monitors, no one entering the room, and no reading questions aloud. A wired internet connection is strongly advisable — a connectivity drop mid-exam is a miserable experience. If your home setup is questionable, the test center is the safer choice.

Either way, your result appears on screen as soon as you submit the exam, and your score report shows performance by domain. If you pass, the certification appears in your CompTIA account shortly afterward. If you fail, there is no waiting period before a second attempt; a third or later attempt requires a 14-day wait. There is no free retake unless you purchased a retake voucher bundle.

The night before: stop studying by early evening. Cramming past that point trades composure for facts you will not retain. Verify your appointment time, your ID, and (for online testing) your system check.

Quick reference

• Exam: CompTIA Network+ N10-009 — up to 90 questions (multiple-choice + PBQs), 90 minutes, scored 100–900, passing 720, voucher $399 USD (US pricing, after the May 2026 price change).
• Prerequisites: none required; A+ and 9–12 months of networking experience recommended. Valid 3 years, renewable via CompTIA CE.
• Domain weights: Troubleshooting 24%, Networking Concepts 23%, Implementation 20%, Operations 19%, Security 14% — study in proportion.
• Scoring rules that matter: unanswered = wrong, so never leave blanks; PBQs carry more weight and often give partial credit — skip-and-return, clear multiple-choice first.
• The two skills that must be automatic: subnetting any CIDR block in under 30 seconds, and the seven-step troubleshooting methodology in order.
• Readiness bar: consistent 85%+ on full-length timed practice exams with no domain below 80%.
• Test delivery: Pearson VUE center or online proctored; government photo ID required; results are immediate.
• Highest-leverage habit: answer and review practice questions from day one — retrieval practice beats re-reading every time.