What is necessary for the FortiSIEM to verify device availability?

To verify device availability, the FortiSIEM utilizes the Ping (ICMP) method. This method works by sending Internet Control Message Protocol (ICMP) echo requests to the target devices. If the devices are available and reachable on the network, they will respond with echo replies, indicating their presence and operational status. This process effectively checks whether the devices are online and able to communicate over the network.

While DNS lookup can be involved in identifying or resolving the address of a device, it does not directly measure the availability of the device itself. A device may have its DNS resolved correctly without being reachable, thus highlighting why Ping (ICMP) is the crucial element for confirming device availability.