CompTIA Network+

Answer: C - Automatic Private IP Addressing (APIPA) best describes a failover mechanism used with DHCP.

Key Takeaway: APIPA is a failover mechanism used with DHCP that allows for devices on the same subnet to continue communicating with one another even when communication with DHCP fails. The APIPA mechanism will assign a private IP address within a specific range to a device when it can no longer reach the DHCP Service. This configuration is easily recognized because the IP address of the device with APIPA activated will always begin with 169.254.x.x. APIPA is enabled by default in modern Windows Operating Systems.