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A complete preparation paper must address the primary domains tested in the CCNA 200-301 Network Fundamentals : Routers, switches, cabling, and the OSI model. Network Access : VLANs, Spanning Tree Protocol (STP), and EtherChannel. IP Connectivity : IPv4/IPv6 routing, OSPFv2, and static routing. IP Services : NAT, DHCP, and NTP. Security Fundamentals : Access Control Lists (ACLs), WPA3, and device hardening. Automation and Programmability cisco ccna free course