CompTIA Network+ Diagnostic Quiz

Not sure where to start? This 24-question diagnostic samples every N10-009 domain in proportion to its weight on the real exam, then tells you which domains to study first. It takes about 8 minutes, there is no timer, and nothing leaves your browser.

24 questions about 8 minutes 5 domains free, no sign-up

Find your weak spots

24 questions, about 8 minutes, no timer. Every domain is sampled, weighted the way the real exam weights it. You get a band for each domain and a study-first list, not a pass prediction.

24 questions~8 min5 domains

No feedback until the end. Your result is saved in this browser only.

Sample N10-009 diagnostic questions

These are real items from the N10-009 bank, one from each of three domains, shown with their answers so you can see the format before you start. The diagnostic itself draws 24 questions from 68 N10-009 terms , and does not reveal answers until the end.

  1. Network Security

    A protocol suite that secures IP traffic with authentication and encryption, commonly used in VPNs.

    Which term does this describe?

    • · IDS / IPS
    • ✓ IPsec
    • · VPN
    • · Zero Trust

    Exam tip: IPsec tunnel mode encrypts the whole packet; transport mode encrypts only the payload.

  2. Networking Concepts

    Which best describes “Subnetting”?

    • · A single copper core surrounded by shielding, commonly used for cable internet and broadband.
    • · A value that separates an IP address into its network and host portions.
    • ✓ Dividing one IP network into smaller subnetworks to improve organization and reduce broadcast traffic.
    • · Classless Inter-Domain Routing — a notation like /24 that shows how many bits are the network prefix.

    Exam tip: Practice converting between CIDR, subnet masks, and host counts — it is heavily tested.

  3. Network Implementation

    An AP extends the wired LAN to wireless clients; many use PoE for power.

    Which term does this describe?

    • ✓ Access Point
    • · SSID
    • · 802.11 Standards
    • · Router

    What it means: A device that bridges wireless clients to the wired network by broadcasting one or more SSIDs.

What the N10-009 diagnostic covers

The quiz mirrors the exam blueprint. Network Troubleshooting carries the most weight on the real N10-009, at about 24% of the test, so it gets the most questions here; Network Security, at about 14%, gets the fewest, but never fewer than 3, because a band should never rest on a single question. The questions draw on the site's N10-009 term bank, so they measure how well you know the concepts and vocabulary the exam is built on. They are not full-length scenario items.

  1. Network Troubleshooting

    24% of the exam

    Exam Domains

    Domain 4 troubleshooting and tools — the largest domain: the structured troubleshooting methodology, common connectivity and performance problems, and the software and hardware tools used to diagnose them.

    12 terms · 2 study sets

  2. Networking Concepts

    23% of the exam

    Exam Domains

    Domain 1 — the foundational theory: the OSI model, ports and protocols, IPv4 and IPv6 addressing, subnetting, DNS and DHCP services, network topologies, cabling and connectors, and cloud networking concepts.

    23 terms · 2 study sets

  3. Network Implementation

    20% of the exam

    Exam Domains

    Domain 2 — deploying networks: switching features like VLANs and STP, routing with static and dynamic protocols, wireless standards and security, and the design of physical and logical infrastructure.

    16 terms · 2 study sets

  4. Network Operations

    19% of the exam

    Exam Domains

    Domain 3 — running networks day to day: monitoring with SNMP and syslog, ensuring high availability and disaster recovery, applying QoS, and using documentation and organizational processes.

    9 terms · 2 study sets

  5. Network Security

    14% of the exam

    Exam Domains

    Domain 4 — securing networks: firewalls, IDS/IPS, network access control, VPNs and IPsec, the zero trust model, and common attacks and hardening techniques.

    8 terms · 2 study sets

How your result is scored

Each domain comes back as a band rather than a percentage: Needs work (under 50% correct), Developing (50% to 79%), or Solid (80% and up). A handful of questions per domain is enough evidence to say "this needs work"; it is not enough to trust a number like 67%, so we do not show one.

The study-first list ranks domains by the share of the exam each one puts at risk: its blueprint weight multiplied by the fraction you missed. On the N10-009 that maths has teeth, because the domains are not equal — Network Troubleshooting is worth about 24% and Network Security about 14%, so half-knowing Network Troubleshooting costs you roughly 12 points of the exam while barely knowing Network Security costs about 11. Up to three domains make the list; if all 5 come back Solid, the list is empty and the full-length mock exam is the next real test.

Every question you miss is written into that study set's flashcard deck as due now, so the review queue starts with your actual gaps — across the 2 study sets in Network Troubleshooting alone, that is the difference between re-reading things you already know and drilling the ones you do not. Your attempts are kept in this browser (the last five), and a retake shows which domains moved up or down since last time.

This is a study map, not a prediction. The real N10-009 runs 90 questions in 90 minutes and is administered by CompTIA; this is 24 untimed questions drawn from the same blueprint. No sample that short can estimate a result on it, and the site's own mock exam uses a 80% practice target rather than a pass prediction for the same reason.

What to do with your result

  1. Step 1

    Open your first focus domain

    Start with the top of the study-first list. Its study sets are linked right on the results screen; flashcards for the terms you missed are already due.

  2. Step 2

    Drill the set, then quiz it

    Flashcards build recall; the per-set quiz checks it with confusable distractors drawn from related terms.

  3. Step 3

    Retake, then take the mock exam

    After a study block, retake the diagnostic to see which bands moved. When the focus list is empty, the timed N10-009 mock exam is the next real test.

All CompTIA Network+ study modes → · How to pass the N10-009 →

Frequently asked questions

How long is the N10-009 diagnostic quiz?
24 questions, untimed. Most people finish in about 8 minutes. Every domain gets at least 3 questions, and the rest are spread in proportion to each domain's weight on the real exam.
Does the result predict whether I will pass?
No. A 24-question sample can tell you which domains need work; it cannot estimate a real N10-009 result. Treat it as a study map, then measure progress with the full-length mock exam.
Where is my result stored?
In your browser only, using local storage. Nothing is uploaded and no account is needed. Retake the quiz later and the results screen compares the two attempts domain by domain.
What happens to the questions I miss?
Each missed term is scheduled as due in that study set's flashcards, so your next review session starts with exactly the gaps the diagnostic found.