How does Restrict mode of port security operate?

In the context of port security on networking devices, Restrict mode operates similarly to Protect mode, with an important distinction regarding how it handles security violations. When port security is configured in Restrict mode, if a violation occurs—meaning an unauthorized device attempts to connect to the port—the switch will not only drop the traffic from this device but also increment the SecurityViolation counter. This provides a way to monitor and register instances where policies are breached, which can aid in network management and security compliance.

The ability to flag violations while still allowing legitimate traffic makes Restrict mode particularly useful for maintaining network security without completely blocking valid connections. This mode thus serves as a proactive measure to protect the network while also keeping an eye on security breaches, which can help in making informed decisions about network access and potential adjustments needed in security policies.