A MAC address identifies network interfaces at Layer 2, but it can be spoofed and should not be trusted alone.
What Is a MAC Address? How It Works and Security Risks
A MAC address is a Layer 2 hardware identifier used for local network delivery, but it lacks cryptographic security and can be spoofed.
A network bridge connects LAN segments at Layer 2, but lacks modern security controls.
What Is a Network Bridge? How It Works and Security Risks
A network bridge is a Layer 2 device that forwards Ethernet frames between segments using MAC address learning, with important performance and security limitations.