Which action can you take to mitigate unicast flooding in a network?
A. Configure VLANs to span multiple access-layer switches.
B. Implement a nonlooped network topology.
C. Set the ARP timer value to less than the CAM timer value.
D. Set the CAM timer value to less than the ARP timer value.
C
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/71079-arp-cam-tableissues.html
The default ARP table aging time is 4 hours while the CAM holds the entries for only 5 minutes. The switch sends out a frame to all forwarding ports within the respective VLAN when the destination MAC address is aged out from the CAM table. You need a CAM aging timer greater or equal to the ARP timeout in order to prevent unicast flooding. As a workaround, you can issue one of these commands in order to increase the CAM aging timer for the VLAN you are having trouble with to match the ARP aging time: