Episode 109: Port Security — Limiting Access at the Switch Edge

Port security helps prevent unauthorized devices from connecting to your network by enforcing MAC address restrictions at the switch port level. In this episode, we cover how port security works, how to configure it on managed switches, and what actions can be taken when violations occur. You’ll learn about sticky MAC addresses, violation modes (protect, restrict, shutdown), and how to monitor security events.

We also discuss use cases such as securing office wall jacks, restricting guest access, and limiting the spread of rogue devices. Port security is especially important in environments with sensitive information or public-facing equipment. This episode provides both the conceptual understanding and practical tools needed to enforce Layer 2 security policies effectively.