Which command is used to view active DHCP leases on a MikroTik router?

The command used to view active DHCP leases on a MikroTik router is effectively identified as the one that specifically deals with the DHCP server functionality. The syntax /ip dhcp-server lease print directly accesses the DHCP server's lease table, which lists all the current leases that have been assigned to clients on the network.

This command provides essential information, including the IP addresses that have been assigned, the corresponding MAC addresses of the devices, the status of the leases (active or expired), and other details pertinent to network management. It's crucial for network administrators to monitor active leases for troubleshooting and ensuring proper network operation.

In contrast, the other options pertain to different functionalities unrelated to DHCP leases. Commands for viewing firewall filters, IP addresses of the router interfaces, and routing tables do not provide information about DHCP leases, thus demonstrating the specificity and relevance of the correct command to the task at hand.