Network fundamentals -- OSI reference model -- TCP/IP protocol suite -- IP addressing basics -- Subnetting and VLSM -- Cisco device basics -- Cisco IOS basics -- Cisco device management -- Switching basics -- Advanced switching features -- Introduction to routing -- OSPF routing -- IP services -- IPv6 -- Wireless networking -- Security fundamentals-- Implementing security on Cisco devices -- Automation and programmability -- Appendix A: Exam readiness checklists: 100-490 & 200-301 -- Appendix B: About the online content.