DNS 101 Miniseries #7 - DNSSEC Chain of Trust
DNSSEC strengthens authentication in DNS using digital signatures based on public key cryptography. With DNSSEC, it's not DNS queries and responses themselves that are cryptographically signed, but rather DNS data itself is signed by the owner of the data.
This video shows how the chain of TRUST is created between PARENT and CHILD zones within DNS.
Other videos mentioned are in this section of the course, you can access them directly.