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Free CompTIA Network+ (N10-009) study guide

Everything Ranger's Packet Trail teaches for CompTIA Network+ (N10-009), as a guide you can read on any phone or computer: 29 chapters and 71 lessons in plain words, with pictures, exam tips, questions to check yourself and a recap with a memory trick at the end of each chapter.

Read a chapter here, then practice it in the game, where 483 more questions, drills and mock exams show you when you are ready.

Start chapter 1 Play Ranger's Packet Trail

  1. 1Day 1: Where the packets liveThe OSI model, layer by layer · Encapsulation and thinking in layersObjectives 1.1
  2. 2Day 2: The gear in the closetPhysical and virtual appliances · Applications and functionsObjectives 1.2
  3. 3Day 3: Head in the cloudCloud models · Cloud networking and connectivityObjectives 1.3
  4. 4Week 1: Doors, numbers and who is listeningCommon ports and protocols · IP protocol types · Traffic typesObjectives 1.4
  5. 5Week 2: Copper, glass and airWireless media · Wired media and cable speeds · Transceivers and connectorsObjectives 1.5
  6. 6Week 3: Shapes on the whiteboard, numbers on the hostsTopologies and architectures · IPv4 addresses: the basicsObjectives 1.6, 1.7
  7. 7Week 4: Subnetting boot campSubnetting, step by step · VLSM: right-sizing every subnetObjectives 1.7
  8. 8Week 5: The network of tomorrow (and IPv6)IPv6 addressing · SDN and SD-WAN · VXLAN, zero trust and SASE/SSE · Infrastructure as code (IaC)Objectives 1.8
  9. 9Weeks 6-8: Warehouse build, routes and VLANsRouting: how routers choose a path · NAT, FHRP and subinterfaces · VLANs, SVIs and trunks · Interfaces, spanning tree and MTUObjectives 2.1, 2.2
  10. 10Weeks 9-10: Warehouse build, Wi-Fi and the closetWireless: bands, channels and names · Wireless: security, antennas and AP types · Physical installation: closets and racks · Physical installation: power and environmentObjectives 2.3, 2.4
  11. 11Week 11: Map the territoryNetwork documentationObjectives 3.1
  12. 12Week 12: Old gear, new rulesLife-cycle management · Change and configuration managementObjectives 3.1
  13. 13Week 13: Listening to the networkSNMP · Flow data, packet capture, port mirroringObjectives 3.2
  14. 14Week 14: Normal, and what isn'tBaselines and logs · Monitoring solutionsObjectives 3.2
  15. 15Week 15: When the lights go outDR metrics · DR sites and high availabilityObjectives 3.3
  16. 16Week 16: Addresses on tapDHCP · IPv6 addressing: SLAACObjectives 3.4
  17. 17Week 17: Names and timeDNS · Time protocols · Tools: nslookup and digObjectives 3.4, 5.5
  18. 18Week 18: From anywhereVPNs · Managing devicesObjectives 3.5
  19. 19Week 19: Who goes there?Security terms and the CIA triad · Logical securityObjectives 4.1
  20. 20Week 20: Walls, traps and auditorsPhysical security and deception · Audits and compliance · Network segmentation enforcementObjectives 4.1
  21. 21Week 21: Know your enemyAttacks on availability and switches · ARP and DNS attacks · Rogue gear, on-path, people, malwareObjectives 4.2
  22. 22Week 22: Lock it downDevice hardening and NAC · Security rules and zones · Tools: Nmap and netstatObjectives 4.3, 5.5
  23. 23Week 23: The methodCompTIA's troubleshooting methodologyObjectives 5.1
  24. 24Week 24: Copper and glassCable issues · Hardware tools for Layer 1Objectives 5.2, 5.5
  25. 25Week 25: Blinking lightsInterface counters and port status · Hardware issues: PoE and transceivers · Device commands: show interface and show powerObjectives 5.2, 5.5
  26. 26Week 26: Loops and lanesSpanning tree issues · VLAN and ACL issues · Tools: show vlan, MAC table, LLDP/CDP, show configObjectives 5.3, 5.5
  27. 27Week 27: Lost packets, wrong turnsRoute selection · Addressing problems · Command-line toolsObjectives 5.3, 5.5
  28. 28Week 28: Slow is the new downNetwork performance issues · Tools: speed tester, protocol analyzer, tcpdumpObjectives 5.4, 5.5
  29. 29Week 29: Rosa's Wi-FiWireless issues · Tool: Wi-Fi analyzerObjectives 5.4, 5.5
  30. A–ZGlossary579 terms and 350 acronyms, each linked to its lesson
Practice it in Ranger's Packet TrailThe same lessons as a story, with drills, hands-on labs and mock exams. Free, in your browser.
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Questions

Is it really free?

Yes. The whole guide and Ranger's Packet Trail are free, with no ads and no sign-up. Nothing to download.

How is it organized?

It follows the official CompTIA Network+ (N10-009) exam objectives. Each chapter teaches a group of objectives, then gives you questions to check yourself and a recap with a memory trick.

How should I study with it?

Read a chapter, answer its questions before you open the answers, then play the same chapter in Ranger's Packet Trail: drills on what you missed, hands-on practice and timed mock exams show when you are ready.

Are these the real exam questions?

No. Real exam questions are kept secret. These are practice questions written to the published objectives, and every answer is explained.

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CompTIA, A+, Network+, Security+ and Linux+ are trademarks of CompTIA, Inc. Ranger Gamez is not affiliated with or endorsed by CompTIA. The practice questions are written to the published exam objectives; they are not real exam questions.