What is DNSSEC?
DNSSEC is a relatively newly deployed extension to the DNS Protocol. With DNSSEC, a digital signature can be added to an outgoing DNS response, and the recipient can validate the signature. This prevents malicious interference with DNS traffic.
DNSSEC only works if both the server and the client understand and support it.
This test, which should take only a few seconds, will show you whether the
client computer you are using is able to validate DNSSEC signatures.