About DNSSEC
DNSSEC (DNS Security Extensions) provides mechanisms for authenticating the source of DNS data and ensuring its integrity. It protects DNS data from certain attacks, such as man-in the middle attacks and cache poisoning. A man-in-the middle attack occurs when an attacker intercepts responses to queries and inserts false records. Cache poisoning can occur when a client accepts maliciously created data. DNSSEC helps you avoid such attacks on your networks.
You can configure DNSSEC as follows: