CompTIA Network+ Lessons

Every lesson is free to read, with three practice questions each. Work through them in order, or jump to the objective you need.

Practise with the exam simulator

  1. The OSI model and how data is encapsulatedObjective 1.1Audio
  2. Topologies, architectures and network typesObjective 1.6Audio
  3. Building a network lab you can breakAudio
  4. Copper and fibre transmission mediaObjective 1.5Audio
  5. Transceivers, connectors and cable standardsObjective 1.5Audio
  6. Routers, switches, firewalls and other appliancesObjective 1.2Audio
  7. Network applications, functions and servicesObjective 1.2Audio
  8. The ports and protocols you have to know coldObjective 1.4Audio
  9. Unicast, broadcast, multicast and anycastObjective 1.4Audio
  10. Binary and hexadecimal for networkingAudio
  11. IPv4 addressing, classes and private rangesObjective 1.7Audio
  12. Subnetting in practiceObjective 1.7Audio
  13. Cloud networking: VPCs, gateways and NFVObjective 1.3Audio
  14. Cloud service and deployment modelsObjective 1.3Audio
  15. SDN, SD-WAN and infrastructure as codeObjective 1.8Audio
  16. IaC practices and the IPv6 transitionObjective 1.8Audio
  17. Switching fundamentals and MAC learningObjective 2.2Audio
  18. VLANs, trunking and spanning treeObjective 2.2Audio
  19. Routing fundamentals and the routing tableObjective 2.1Audio
  20. Dynamic routing protocols and route selectionObjective 2.1Audio
  21. Wireless standards and RF fundamentalsObjective 2.3Audio
  22. Deploying and securing wireless networksObjective 2.3Audio
  23. Physical installations, power and environmentObjective 2.4Audio
  24. DHCP and dynamic address assignmentObjective 3.4Audio
  25. DNS in operationObjective 3.4Audio
  26. DNS zones, resolution and time servicesObjective 3.4Audio
  27. Monitoring a network and reading its signalsObjective 3.2Audio
  28. SNMP, flow data and loggingObjective 3.2Audio
  29. Documentation, diagrams and asset recordsObjective 3.1Audio
  30. Change, configuration and lifecycle managementObjective 3.1Audio
  31. Disaster recovery, redundancy and continuityObjective 3.3Audio
  32. Remote access and out-of-band managementObjective 3.5Audio
  33. Security fundamentals: CIA, AAA and least privilegeObjective 4.1Audio
  34. Authentication, authorization and complianceObjective 4.1Audio
  35. Physical security, segmentation and deceptionObjective 4.1Audio
  36. Attacks and their impact on the networkObjective 4.2Audio
  37. Hardening, access control and network defencesObjective 4.3Audio
  38. The troubleshooting methodologyObjective 5.1Audio
  39. Cabling and physical-layer faultsObjective 5.2Audio
  40. Cable testing and certification toolsObjective 5.2Audio
  41. Troubleshooting network servicesObjective 5.3Audio
  42. Troubleshooting performance and throughputObjective 5.4Audio
  43. Command-line diagnostic toolsObjective 5.5Audio
  44. Hardware tools and device commandsObjective 5.5Audio