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Explore Why Your Network Is WIDE OPEN - and How to Fix It with 134,221 views, 2,665 likes, and 54 comments. Experience the impact of this video content that has captured audience attention.

Learn how to protect your Ethernet network from unauthorized access by configuring port security on a Cisco switch! In this free CCNA course segment, we cover: • Why Ethernet ports lack built-in authentication and common attack methods (e.g., Shark Jack, rogue switches, rogue Wi-Fi APs) • Port security basics: MAC-based filtering, default limits, and violation modes (shutdown, restrict, protect) • Step-by-step CLI demo: enabling port security on GigabitEthernet1/0/1, observing learned MACs, and simulating violations with extra devices • Understanding MAC address tables vs. port-security tables, and advanced options (static MAC entries, sticky MAC) • Limitations of dynamic learning and tips for persistent, enterprise-grade security Whether you’re studying for CCNA or hardening your corporate LAN, this tutorial will empower you to prevent unauthorized plugs and unwanted traffic. // Playlist to CCNA Course REFERENCE // https://www.youtube.com/watch?v=tj3yCZWOWYc&list=PLw6kwOJVj3MbMZ8B72ZgUryj8OSETC0ds // David's SOCIAL // Discord: https://discord.com/invite/usKSyzb X: https://www.twitter.com/davidbombal Instagram: https://www.instagram.com/davidbombal LinkedIn: https://www.linkedin.com/in/davidbombal Facebook: https://www.facebook.com/davidbombal.co TikTok: http://tiktok.com/@davidbombal YouTube: https://www.youtube.com/@davidbombal Spotify: https://open.spotify.com/show/3f6k6gERfuriI96efWWLQQ SoundCloud: https://soundcloud.com/davidbombal Apple Podcast: https://podcasts.apple.com/us/podcast/david-bombal/id1466865532 // MY STUFF // https://www.amazon.com/shop/davidbombal // SPONSORS // Interested in sponsoring my videos? Reach out to my team here: [email protected] // MENU // 00:00 – Ethernet Bypass Explained 00:42 – Accessing the Switch via Ethernet Port 03:03 – Unauthorised Devices on the Network 03:35 – CCNA Course Overview with Real Examples 06:48 – How to Enable Port Security 07:56 – Port Security Demo 10:28 – Understanding MAC Addresses 12:55 – Fixing “Err-Disabled” Port State 15:35 – Using ‘shutdown’ and ‘no shutdown’ Commands 15:59 – Testing Port Security in Action 17:47 – Final Thoughts & Key Takeaways Please note that links listed may be affiliate links and provide me with a small percentage/kickback should you use them to purchase any of the items listed or recommended. Thank you for supporting me and this channel! Disclaimer: This video is for educational purposes only. #ccna #networking #security

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