Prepare for Network+ N10-009 by covering all five domains and practicing how to explain networking decisions. Use the official objectives to find gaps, work through address and troubleshooting scenarios, and try CompTIA's sample performance-based questions. This guide includes a worked RFC 1918 exercise and a practical checklist.
Which Network+ version should you study?
The current exam is N10-009, version V9, launched June 20, 2024.
Its scope includes connectivity, network services, documentation, monitoring, cloud and virtual networking, troubleshooting, and security. Check the code on your course or book and map any older material to the N10-009 objectives.
CompTIA recommends A+ knowledge and 9–12 months in a junior network administrator or network support role. These are preparation recommendations, not an admission requirement to hold A+.
CompTIA estimates retirement in 2027. An estimated cycle is not a confirmed last testing date; check the current certification page before booking.
Sources used: Network+ (Plus) Certification | CompTIA — Certification overview and exam details section; CompTIA Network+ N10-009 Certification Exam: Exam Objectives, Version 4.0 — About the Exam, Test Details, and Domains 1.0–5.0
What to expect on the exam
N10-009 runs for 90 minutes with a maximum of 90 questions, mixing multiple-choice items with performance-based questions (PBQs). You need 720 on a scale of 100–900 to pass.
Maximum means you may receive fewer questions. The 720 is a scaled score, so it does not convert into a raw percentage or a fixed number of mistakes you can afford.
CompTIA lists Network+ among the certifications that use simulation PBQs. A simulation approximates a tool or environment, such as a firewall or terminal window, and may restrict available functionality. You can skip a simulation PBQ and return to it later; your work is saved when you move to another item, and Reset clears that question only.
CompTIA states that a PBQ may have more than one valid solution path and that partial credit may be given. It does not publish per-item scoring details, so follow the question instructions and aim for a complete solution.
The sample PBQs published on CompTIA's site illustrate the format; they are not actual exam questions. Use them to learn how the simulation controls behave before practicing your pacing.
Sources used: Network+ (Plus) Certification | CompTIA — Certification overview and exam details section; Performance-Based Questions Overview | CompTIA — Simulations, virtual environments, and PBQ tips; Performance-Based Questions FAQs | CompTIA Blog — FAQ on reset, navigation, scoring and partial credit; CompTIA Network+ N10-009 Certification Exam: Exam Objectives, Version 4.0 — About the Exam, Test Details, and Domains 1.0–5.0
What to study in each domain
Use the domain weights and your knowledge gaps together. Troubleshooting has the largest share at 24%, but the weighting does not determine every candidate's study schedule.
The full objectives document includes numbered tasks and examples. Its lists are not exhaustive, and the weights are not guaranteed question counts. Use the detailed document to check coverage.
The table pairs syllabus topics with suggested practice. For technical explanations or lab commands, also use documentation for the product or protocol concerned; a topic appearing on the syllabus does not establish every detail of how it works.
| Domain | Weight | Focus your practice on |
|---|---|---|
| Networking Concepts | 23% | OSI layers, appliances, cloud concepts, ports, media, topologies, and IPv4 addressing. Sketch a network and explain each component; practice addressing and subnet calculations. |
| Network Implementation | 20% | Routing, switching, wireless, and physical installation. Review a small network design and list the configuration and installation questions it raises. |
| Network Operations | 19% | Documentation, monitoring, life-cycle and change management, disaster recovery, and services including DHCP, DNS, and NTP. Draft a change record and interpret a sample monitoring report. |
| Network Security | 14% | Logical security, segmentation, attacks, and hardening. Compare a stated access requirement with the purpose and scope of proposed controls. |
| Network Troubleshooting | 24% | Methodology, cabling, network services, performance, and tools. Work a paper fault report from symptoms through investigation, verification, and documentation. |
Sources used: CompTIA Network+ N10-009 Certification Exam: Exam Objectives, Version 4.0 — About the Exam, Test Details, and Domains 1.0–5.0
Practice: which addresses are private?
RFC 1918 defines private IPv4 blocks as 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
These span 10.0.0.0–10.255.255.255, 172.16.0.0–172.31.255.255, and 192.168.0.0–192.168.255.255. Organizations can use this space without obtaining globally unique allocations for those addresses. Separate private networks can reuse it.
Classifying an address only answers whether it belongs to these blocks. An address outside them is not automatically assigned, available for your use, reachable, or secure. Private addressing alone also does not establish security.
Practice exercise
Classify each address as inside or outside the RFC 1918 private space, using only the reserved ranges: (a) 172.20.4.8, (b) 172.32.4.8, (c) 192.168.7.9. Then state one thing the classification proves and one thing it does not.
Show answer
(a) Inside — 172.20 falls within 172.16.0.0–172.31.255.255. (b) Outside — 172.32 is beyond the private range, which ends at 172.31.255.255. (c) Inside — the whole 192.168.0.0–192.168.255.255 block is private. The check proves whether the address sits in reserved private space; it does not prove that a public-looking address is actually allocated to anyone or available for your use.
For 172.16.0.0/12, the second octet runs from 16 through 31. That includes 172.20.4.8 and excludes 172.32.4.8. The third address falls in 192.168.0.0/16. The exercise uses only the RFC 1918 ranges; it supplies no allocation, routing, or security information about any address.
Sources used: RFC 1918: Address Allocation for Private Internets — Section 3, Private Address Space; CompTIA Network+ N10-009 Certification Exam: Exam Objectives, Version 4.0 — About the Exam, Test Details, and Domains 1.0–5.0
How to work through troubleshooting questions
Separate the symptom, your theory, and the evidence needed to test that theory. Then follow the methodology in objective 5.1.
The objective starts with gathering information, questioning users, identifying symptoms and changes, and reproducing the problem when possible. It then distinguishes proposing a likely cause from testing it. If a theory is not confirmed, establish another theory or escalate.
After confirming a theory, plan the action and its potential effects, implement or escalate, and verify full functionality. Apply preventive measures when appropriate. The objective calls for documenting findings, actions, outcomes, and lessons throughout the process.
As a study habit, write down what a scenario establishes and what it leaves unknown. A device name or one successful test does not establish the entire cause. Avoid choosing a fix solely because a familiar symptom appears in the question.
| Stage | Suggested practice |
|---|---|
| Identify the problem | List observed symptoms, affected users, recent changes, and missing information. |
| Establish and test a theory | State a possible cause and what evidence would support or weaken it. |
| Plan and implement or escalate | Explain the proposed action, likely effects, and whether escalation is appropriate. |
| Verify and document | Explain how to check full functionality and what to record throughout the investigation. |
Sources used: CompTIA Network+ N10-009 Certification Exam: Exam Objectives, Version 4.0 — About the Exam, Test Details, and Domains 1.0–5.0
Your preparation checklist
Use this suggested sequence to identify gaps and practice applying what you learn.
For each practice error, record the topic, the reasoning that led to your answer, and what the explanation changes. A single short quiz does not establish readiness across the full syllabus.
- Match books and courses to N10-009 and download the current objectives.
- Mark tasks you can explain, tasks you have practiced, and topics needing more work.
- Review the private-address exercise and practice subnetting with fully specified address and host requirements.
- Use product and protocol documentation when checking lab results or technical claims.
- Try official sample PBQs and review the simulation controls.
- Practice troubleshooting without assuming an untested theory is the cause.
- Use timed practice to assess pacing, then revisit the objectives behind your errors.
Sources used: Network+ (Plus) Certification | CompTIA — Certification overview and exam details section; RFC 1918: Address Allocation for Private Internets — Section 3, Private Address Space; Performance-Based Questions Overview | CompTIA — Simulations, virtual environments, and PBQ tips; Performance-Based Questions FAQs | CompTIA Blog — FAQ on reset, navigation, scoring and partial credit; CompTIA Network+ N10-009 Certification Exam: Exam Objectives, Version 4.0 — About the Exam, Test Details, and Domains 1.0–5.0
Booking and retakes
Check the exam code, language, price, voucher terms, and appointment instructions with CompTIA before booking.
After a first failure there is no required waiting period before the second attempt. Before a third or later attempt, wait at least 14 calendar days after the most recent attempt.
Each attempt normally requires payment. The standard policy does not promise free retests; separate retake bundles have their own terms. After earning a certification, you need CompTIA's prior consent to retake the same exam code.
Sources used: Network+ (Plus) Certification | CompTIA — Certification overview and exam details section; CompTIA Certification Retake Policy | CompTIA — Waiting periods, retake payment, and post-certification retake rules
Sources used
Facts checked against official sources:
- Network+ (Plus) Certification | CompTIA
- RFC 1918: Address Allocation for Private Internets
- Performance-Based Questions Overview | CompTIA
- Performance-Based Questions FAQs | CompTIA Blog
- CompTIA Certification Retake Policy | CompTIA
- CompTIA Network+ N10-009 Certification Exam: Exam Objectives, Version 4.0