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CompTIA Network+ (N10-009) Practice Test & Study Guide

Everything you need to plan your N10-009 prep: the exam format, what each domain covers, a week-by-week study plan, original practice questions, and what thousands of study-group comments reveal about where candidates slip up.

Last updated · By the NotJustExam team

About the CompTIA Network+ (N10-009) exam

CompTIA Network+ (N10-009) is a vendor-neutral certification that proves you can design, configure, manage, secure, and troubleshoot the wired and wireless networks that businesses run on. The N10-009 version launched in mid-2024 and refreshes the older N10-008 objectives to reflect modern realities like software-defined networking, cloud connectivity, zero-trust security concepts, SD-WAN, and IPv6.

It is aimed at early-career IT professionals: help-desk technicians moving into network roles, junior network administrators, NOC analysts, and field technicians. CompTIA positions it as a step beyond the entry-level A+, so candidates are expected to already understand basic hardware and operating systems.

Network+ matters because it is one of the most widely recognized credentials for foundational networking skills and is frequently listed in junior network and systems job postings. Unlike a vendor exam, it teaches concepts that transfer across Cisco, Juniper, cloud, and home-grown environments, which makes it a durable resume line rather than a product-specific badge.

CompTIA Network+ (N10-009) exam format at a glance

AttributeDetail (as of 2026, verify on the official page)
Exam codeN10-009
Number of questionsMaximum of 90
Question typesMultiple choice (single and multiple response) and performance-based questions (PBQs)
Duration90 minutes
Passing score720 on a scale of 100-900
CostApproximately 358 USD per attempt (regional pricing and vouchers vary)
LanguagesEnglish at launch, with additional languages added over the exam's life
DeliveryOnline proctored (Pearson OnVUE) or in person at a Pearson VUE test center
Validity3 years, renewable through CompTIA's Continuing Education (CE) program

CompTIA Network+ (N10-009) domains & what they cover

The N10-009 blueprint is organized into five domains. The approximate weightings below indicate roughly how many questions each area contributes.

  • Networking Concepts (about 23%) — The theory layer: the OSI model, common ports and protocols, IP addressing and subnetting, and cloud and modern network architectures. Expect questions that test whether you understand why a technology exists, not just its name.
  • Network Implementation (about 20%) — Building the network: choosing and deploying switches, routers, wireless standards, and routing technologies, plus correctly cabling and configuring devices for a given scenario.
  • Network Operations (about 19%) — Keeping it running: documentation, monitoring, high availability, disaster recovery, and the organizational processes that keep a network healthy day to day.
  • Network Security (about 14%) — Defending the network: physical and logical controls, common attack types, hardening techniques, and foundational zero-trust and least-privilege ideas applied to network design.
  • Network Troubleshooting (about 24%) — The largest domain: applying a structured methodology to diagnose cabling, connectivity, wireless, and service problems using the right tools and commands.

How hard is CompTIA Network+ (N10-009)?

Network+ is considered moderately challenging — harder than A+ but more approachable than Security+ for most people. The difficulty is not in memorizing trivia; it is in applying knowledge under time pressure. The performance-based questions, which often appear first, ask you to configure or troubleshoot in a simulated interface, and they can consume time quickly if you are unsure.

Common sticking points are subnetting (you need to do it quickly and confidently without a calculator), distinguishing the many similar-sounding protocols and ports, and reading troubleshooting scenarios carefully enough to pick the best next step rather than a merely correct one. With 90 minutes for up to 90 items, pacing matters.

A realistic prep timeline is roughly 6 to 10 weeks of consistent study for someone with some hands-on exposure, or longer if networking is brand new to you.

How to prepare for CompTIA Network+ (N10-009): a study plan

  1. Weeks 1-2 — Concepts foundation. Work through Domain 1. Drill the OSI model, ports/protocols, and subnetting until subnetting feels automatic. Do timed subnetting reps daily.
  2. Weeks 3-4 — Implementation and operations. Cover Domains 2 and 3. Reinforce with a free network simulator or virtual lab so the device configuration concepts become muscle memory rather than abstractions.
  3. Week 5 — Security. Tackle Domain 4. Map each attack type to its mitigation; this framing makes the security questions far easier to reason through.
  4. Weeks 6-7 — Troubleshooting and PBQ practice. Domain 5 is the biggest, so spend real time here. Practice the troubleshooting methodology as a repeatable sequence and rehearse PBQ-style tasks under a clock.
  5. Final week — Full practice exams. Take complete, timed practice tests. The goal is to surface weak domains, not to chase a perfect score.

Use practice questions actively: after each one, explain to yourself why the right answer is right and why each distractor is wrong. That habit builds the elimination skill the real exam rewards. Review every missed question and revisit the underlying objective rather than just rereading the answer.

CompTIA Network+ (N10-009) FAQ

How much does the Network+ exam cost?

A single attempt is approximately 358 USD as of 2026, though pricing varies by region and discounted vouchers or training bundles are often available. Verify the current price on the official CompTIA page.

How long is the certification valid?

Network+ is valid for three years from the date you pass. You can renew it through CompTIA's Continuing Education program by earning activity units, or by passing a higher-level CompTIA exam, rather than retaking N10-009.

Are there prerequisites?

There are no enforced prerequisites, so anyone may sit the exam. CompTIA recommends holding A+ and having roughly 9 to 12 months of hands-on networking experience first.

What is the retake policy if I fail?

You may retake the exam a second time immediately, but a 14-day waiting period applies before any third or subsequent attempt. Each attempt requires a separate fee.

Do the N10-008 and N10-009 versions differ?

Yes. N10-009 is the current revision and reorganizes the domains with updated emphasis on cloud, modern architectures, and security. If you are starting now, study to the N10-009 objectives.

Is Network+ worth it?

For people targeting junior network or systems roles, it is a strong, widely recognized credential that signals broad, vendor-neutral competence and pairs well as a stepping stone toward Security+ or vendor certifications.

Free N10-009 practice questions

5 original questions written for NotJustExam from the public N10-009 exam objectives and independently answer-checked. Try answering before you open the explanation.

Question 1

A network technician is troubleshooting an application that cannot establish a session even though the client can ping the server successfully. At which OSI layer should the technician begin investigating first, since Layer 1-3 connectivity is confirmed?

  1. Layer 4 (Transport)
  2. Layer 1 (Physical)
  3. Layer 2 (Data Link)
  4. Layer 7 (Application)
Show answer & explanation

Answer: A. Since ICMP echo (ping) confirms Layers 1-3 are functioning, the next layer to check is Layer 4, where session establishment (such as a TCP three-way handshake, port availability, or a blocking firewall rule) would prevent the application from connecting. Jumping straight to Layer 7 is a tempting shortcut because the symptom is an application problem, but skipping Layer 4 could miss a simple blocked-port or transport-layer issue that is the actual root cause.

Question 2

A switch port connects to another switch that carries traffic for multiple VLANs. Which port configuration is required on this link?

  1. Access port assigned to the native VLAN
  2. Port configured for half-duplex operation
  3. Trunk port with 802.1Q tagging enabled
  4. Port with storm control disabled
Show answer & explanation

Answer: C. A trunk port using 802.1Q tagging allows a single physical link to carry traffic for multiple VLANs by adding a VLAN tag to each frame, which is exactly what is needed between two switches. An access port is a common wrong choice because it is the default port type, but it can only carry a single, untagged VLAN and would drop the multi-VLAN requirement.

Source: official documentation

Question 3

A company wants to ensure that if its primary data center becomes unavailable, operations can continue from a secondary site with only a brief interruption, using continuously replicated, ready-to-run systems. Which disaster recovery site type best describes this approach?

  1. Cold site
  2. Warm site
  3. Cloud site with no pre-provisioned resources
  4. Hot site
Show answer & explanation

Answer: D. A hot site maintains fully operational, continuously replicated systems ready to take over almost immediately, matching the requirement of only a brief interruption. A warm site is a frequent distractor because it also has some infrastructure in place, but it requires additional setup and data synchronization before it can take over, resulting in longer downtime than described.

Source: official documentation

Question 4

An attacker floods a switch's MAC address table with thousands of fake source MAC addresses, causing the switch to broadcast traffic out all ports instead of forwarding it only to the correct destination. What is this attack called?

  1. MAC flooding
  2. ARP spoofing
  3. VLAN hopping
  4. DNS poisoning
Show answer & explanation

Answer: A. MAC flooding overwhelms the switch's finite CAM/MAC address table, forcing it into a fail-open state where it floods frames to all ports like a hub, which the attacker can then use to sniff traffic. ARP spoofing is a common mix-up because it also targets Layer 2 trust, but it works by sending forged ARP replies to redirect traffic rather than exhausting the switch's MAC table.

Source: official documentation

Question 5

Following a structured troubleshooting methodology, after a network technician has identified the probable cause of an outage, what is the next step before implementing a fix?

  1. Document the outcome and lessons learned
  2. Test the theory to determine the actual cause
  3. Establish a theory of probable cause
  4. Escalate the issue to the vendor immediately
Show answer & explanation

Answer: B. After forming a theory of probable cause, the correct next step is to test that theory (for example, by checking configurations or replicating conditions) to confirm it before moving on to establishing and implementing a plan of action. Documenting lessons learned is a distractor because it is a real step in the methodology, but it belongs at the very end of the process, not immediately after identifying a probable cause.

Source: official documentation

What 695 study-group comments reveal about N10-009

We summarised the public study-group discussion behind every question in our N10-009 bank and compared it with an independent AI review. Where they disagree, a posted answer key alone is not enough to trust — which is why every question in the full bank shows the community vote, a discussion summary and a reasoned explanation side by side.

273practice questions reviewed
695study-group comments summarised from Q2 2021 – Q2 2025
1%of questions where the answer commonly posted online is disputed
12%of single-answer questions where the community vote is split

The N10-009 traps that come up most

  • Troubleshooting methodology step order matters — After identifying the problem, establish a theory of probable cause, then test that theory before moving to a plan of action — testing the theory, not the OSI-layer check itself, is the step that confirms the cause.
  • Administrative distance, not hop count, picks routes — When multiple routing sources offer a path to the same destination, administrative distance decides which source wins; hop count is just a metric used within a single distance-vector protocol, not a cross-protocol tiebreaker.
  • Multimode vs single-mode fiber core size — Multimode fiber has a larger core that lets light travel multiple paths over shorter distances, while single-mode fiber uses a much smaller core for one direct light path over long distances — don't swap the two.
  • Narrower wireless channels reduce overlap in dense areas — In dense deployments, narrower channel widths (such as 20 MHz) leave more non-overlapping channels available, while wider channels (40/80/160 MHz) are more likely to overlap and cause interference.
  • OSPF uses multicast, not broadcast, for updates — OSPF routers exchange routing information using reserved multicast addresses (all-OSPF-routers and all-DR addresses) rather than broadcasting to every device, which keeps routing updates efficient.

Inside the full N10-009 practice bank

  • 273 practice questions in an interactive web app, plus a printable PDF
  • The community-voted answer and a summary of the study-group discussion for each question
  • A step-by-step AI explanation of why the right answer is right — and why the others are not
  • One-time $9.99, lifetime access, no subscription

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Independent study material. NotJustExam is not affiliated with, endorsed by, or sponsored by any certification body; all certification names, trademarks and exam codes belong to their owners and are used for descriptive purposes only. The sample questions on this page are original items written for NotJustExam from the publicly available exam objectives. Exam facts change — always confirm details on the official exam page before you register.