Free online courseCCNA 200-301: Networking, Subnetting, Switching, Routing and Security

Course Description

CCNA 200-301: Networking, Subnetting, Switching, Routing and Security is a free online course designed to build a strong, practical foundation in computer networking for anyone aiming to understand how modern networks operate and how Cisco-style networks are configured and secured.

You will move from core fundamentals such as network types, communication modes, cabling, and the OSI model into essential IP networking skills. The course explains IPv4 addressing concepts, binary conversion, IP classes, subnet masks, network and broadcast IDs, plus subnetting and VLSM with worked examples to help you confidently design efficient address plans.

As you progress, you will deepen your understanding of switching and routing. Learn how frames are forwarded, how MAC tables work, and how VLANs, trunking, 802.1Q, native VLANs, CDP/LLDP, EtherChannel, and STP are used to build resilient Layer 2 networks. On the routing side, you will cover routing tables, default and static routes, floating statics, and OSPF fundamentals including areas, router IDs, adjacencies, and network types.

The course also introduces wireless concepts and components, along with virtualization basics, IPv6 addressing and types, and common enterprise services and operations such as NAT/PAT, NTP, DHCP and relay, DNS, SNMP, Syslog, and TFTP. Security topics include foundational security principles, secure remote access, password hardening, port security, DHCP snooping, and access control lists. You will also get exposure to controller-based networking, SDN concepts, REST APIs, and data formats used in automation.

Hands-on learning is supported through guidance on installing and using Cisco Packet Tracer and practicing baseline device configurations, making this a solid starting point for CCNA exam preparation and real-world networking skills.