What should be configured in MikroTik RouterOS to blacklist a specific MAC address?

To blacklist a specific MAC address in MikroTik RouterOS, you need to configure firewall filter rules. Firewall filters are designed to allow or deny traffic based on defined criteria, such as source or destination IP addresses and MAC addresses. By creating a specific filter rule that targets the MAC address you want to blacklist, you can effectively prevent any network traffic from that device from being processed by the router.

By using a firewall filter rule, you can block unwanted traffic from the blacklisted MAC address at the appropriate point in the packet handling process. This is crucial in network security management, as it allows for granular control over which devices are permitted to interact with the network resources.

The other choices, while relevant to various network management tasks, do not serve the purpose of blacklisting a MAC address. User settings pertain to authentication and access management, DHCP settings are used for dynamically assigning IP addresses to devices, and "None of the above" does not apply since there is a correct method for blacklisting a MAC address, which is through firewall filter rules.