This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.

In this episode you will learn:

- How the 802.1Q standard inserts a 4-byte tag into Ethernet frames to carry traffic for multiple VLANs.

- The specific function of the Native VLAN and why its frames are sent untagged across a trunk link.

- The security vulnerabilities and network issues caused by a Native VLAN mismatch, a common CCNA exam scenario.

- The essential Cisco IOS commands, such as `switchport mode trunk` and `switchport trunk native vlan`, for trunk configuration.

- How Dynamic Trunking Protocol (DTP) modes, including 'dynamic desirable' and 'dynamic auto', negotiate a trunk link between switches.

For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep