To enhance security on RouterOS, which action should be taken to prevent discoverability via MNDP or CDP?

To enhance security on RouterOS and prevent discoverability via MNDP (MikroTik Neighbors Discovery Protocol) or CDP (Cisco Discovery Protocol), employing multiple strategies is essential. Each proposed action contributes to minimizing the risk of unauthorized access and exposure of network topology to potentially malicious actors.

First, adding a Deny All input firewall rule helps prevent any unsolicited inbound connections to the router. This means that even if an attacker can send discovery packets, the router will not respond, thereby obscuring its identity and configuration details. This approach is foundational in securing the network by providing a strong barrier against external discovery attempts.

Disabling all discovery interfaces is another proactive measure, as it directly stops the router from broadcasting its availability over the network. With discovery protocols like MNDP and CDP enabled, devices on the same network can easily learn about each other's existence and details. Disabling these interfaces ensures that the router will not announce itself or respond to discovery requests, further enhancing its security posture.

Disabling the MAC server for Winbox is also critical, as it prevents the router from responding to discovery requests made via the MAC address. Winbox is a popular graphical interface for RouterOS, and if the MAC server is enabled, it makes it easier for attackers