Professor Messer's YouTube channel offers a comprehensive CCNA course with over 100 video lectures. The course covers all aspects of the CCNA curriculum, including networking fundamentals, routing, switching, and troubleshooting. The videos are well-produced, engaging, and easy to follow.
Cisco offers a free online course, "CCNA Routing and Switching," on their website. This course covers the basics of networking, routing, and switching, and includes interactive activities, videos, and quizzes. Although it's not as comprehensive as their paid courses, it's a great starting point for those new to networking.
Based on the courses reviewed, we recommend starting with Cisco's official CCNA course and supplementing with Professor Messer's or TechWorld with Nana's courses. These courses provide a comprehensive introduction to CCNA-level networking topics and can help you build a strong foundation for further study.