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NSEC — a signed DNSSEC record that proves nonexistence by linking an existing name to the next name in canonical zone order and listing present record types.
DNSSEC authenticates DNS data and protects its integrity with digital signatures; it does not encrypt queries. The chain of trust runs from the root through a DS record to the child zone’s keys, and an inconsistent link causes validation failure.
NSEC — a signed DNSSEC record that proves nonexistence by linking an existing name to the next name in canonical zone order and listing present record types.
It creates, publishes, or validates part of the chain of trust so a validating resolver can determine whether data was signed by an authorized key and remained unchanged.
Verify algorithms, signature validity periods, DS-to-DNSKEY matching, required records on every authoritative server, and successful external validation before removing old keys.
