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 1.2
  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 1.7
  13. Cloud networking: VPCs, gateways and NFVObjective 1.3
  14. Cloud service and deployment modelsObjective 1.3
  15. SDN, SD-WAN and infrastructure as codeObjective 1.8
  16. IaC practices and the IPv6 transitionObjective 1.8
  17. Switching fundamentals and MAC learningObjective 2.2
  18. VLANs, trunking and spanning treeObjective 2.2
  19. Routing fundamentals and the routing tableObjective 2.1
  20. Dynamic routing protocols and route selectionObjective 2.1
  21. Wireless standards and RF fundamentalsObjective 2.3
  22. Deploying and securing wireless networksObjective 2.3
  23. Physical installations, power and environmentObjective 2.4
  24. DHCP and dynamic address assignmentObjective 3.4
  25. DNS in operationObjective 3.4
  26. DNS zones, resolution and time servicesObjective 3.4
  27. Monitoring a network and reading its signalsObjective 3.2
  28. SNMP, flow data and loggingObjective 3.2
  29. Documentation, diagrams and asset recordsObjective 3.1
  30. Change, configuration and lifecycle managementObjective 3.1
  31. Disaster recovery, redundancy and continuityObjective 3.3
  32. Remote access and out-of-band managementObjective 3.5
  33. Security fundamentals: CIA, AAA and least privilegeObjective 4.1
  34. Authentication, authorization and complianceObjective 4.1
  35. Physical security, segmentation and deceptionObjective 4.1
  36. Attacks and their impact on the networkObjective 4.2
  37. Hardening, access control and network defencesObjective 4.3
  38. The troubleshooting methodologyObjective 5.1
  39. Cabling and physical-layer faultsObjective 5.2
  40. Cable testing and certification toolsObjective 5.2
  41. Troubleshooting network servicesObjective 5.3
  42. Troubleshooting performance and throughputObjective 5.4
  43. Command-line diagnostic toolsObjective 5.5
  44. Hardware tools and device commandsObjective 5.5