Network+ practice test (N10-009): free questions with explanations

Practise for the CompTIA Network+ exam with original multiple-choice questions on the five N10-009 domains: networking concepts, implementation, operations, security and troubleshooting. Start with 5 free questions, then take two full tests of 60 questions in 60 minutes, with subnetting worked out, an explanation for every answer and your score per domain.

• 5 free questions
• 2 full tests, 120 questions
• 60 questions in 60 minutes
• Subnetting worked out
• Practice certificate PDF

Network+ N10-009 exam format and passing score

Source: comptia.org, Network+ certification page, checked 25 October 2026. N10-009 (V9) launched on 20 June 2024. CompTIA says exams usually retire about three years after launch and estimates 2027; on 25 October 2026 comptia.org named no successor exam or date. The 720 is a scaled score, so a MyLevel percentage does not convert to it, and the performance-based questions (simulations where you configure or drag items) are not simulated here.

The five N10-009 domains and their weights

• Concepts: OSI model, ports and protocols, IPv4 subnetting, IPv6, cabling and fiber, cloud and modern designs (SD-WAN, VXLAN, zero trust, infrastructure as code).
• Implementation: routing, NAT, VLANs and trunks, spanning tree, link aggregation, PoE and Wi-Fi.
• Operations: monitoring, documentation, change management, disaster recovery, DHCP, DNS, NTP and remote access.
• Security: AAA, 802.1X, attacks and switch-level defenses.
• Troubleshooting: the CompTIA method, cable, service and wireless problems, and the tools.

Source: comptia.org, Network+ certification page, checked 25 October 2026.

What you practise on MyLevel

Every question is an original MyLevel question on the official domains, with one correct answer, three wrong ones and a short explanation. Every subnetting and throughput answer (hosts per prefix, masks, network and broadcast addresses, route summaries, longest prefix match, transfer time) was re-computed by script.

• Subnetting by hand: /26, /27 and /29 hosts, block sizes, network and broadcast addresses, summarizing four /24s.
• Ports that come up again and again: SSH 22, DNS 53, NTP 123, SNMP 161 and 162, HTTPS 443, RDP 3389.
• Symptoms to causes: APIPA, wrong gateway or mask, DNS failure, duplex and native VLAN mismatches, switching loops, MTU, jitter.
• Which tool fits: traceroute, nslookup and dig, ipconfig, TDR, toner and probe, Wi-Fi analyzer.

Start with 5 free questions, one from each domain. The full pack costs $9.99, a one-time payment with no subscription and no time limit, and also unlocks every other MyLevel job test, including the A+ and Security+ practice tests.

How to study for Network+

• Start with troubleshooting and concepts: together they are 47% of the exam. Learn the seven troubleshooting steps in order: identify the problem, establish a theory, test it, plan, implement, verify, document.
• Subnet on paper until it is quick: hosts = 2^(32 - prefix) - 2, and the interesting octet moves in blocks of 256 minus the mask value (/26 = blocks of 64).
• Learn the look-alikes: RPO is data loss, RTO is downtime; UDP 161 is polling, 162 is traps; DoT uses 853, DoH 443; TACACS+ uses TCP and encrypts everything, RADIUS uses UDP.
• Leave performance-based questions for later: on the real exam you can flag them, answer the multiple-choice questions first and return.
• Practise under time: take a full 60-question test in one sitting, read every explanation and retake your weakest domain until you score 80% or more.

MyLevel is independent and not affiliated with, or endorsed by, CompTIA. CompTIA and Network+ are trademarks of CompTIA, Inc. All questions are original practice questions written by MyLevel from the published N10-009 domain list, not real exam questions, and a practice score is not a CompTIA result or certification. Performance-based questions are not simulated.

Sample question with explanation

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