In 2016, the company elevated its capabilities with the $45m acquisition of IID, a threat intelligence firm, making it the first DNS, Dynamic Host Configuration Protocol (DHCP) and IP address ...

The domain name system (DNS), which enables any computer on the internet to be identified in a human-readable form, is often regarded as the modern equivalent to the classic phone book.

If I leave this DNS suffix blank, the Radius server cannot authenticate my machine probably. If I put my DNS suffix in there, it can authenticate the machine.