Which command is used to check if DNSSEC is working for a domain?

The command used to check if DNSSEC (Domain Name System Security Extensions) is functioning for a domain is "dig +dnssec." This command enhances the standard DNS lookup capabilities of "dig" by including DNSSEC-related records in its query.

When you append "+dnssec" to the dig command, it requests both the usual DNS records and the associated DNSSEC records, such as RRSIG (Resource Record Signature), which are crucial for verifying the authenticity and integrity of the DNS data. If DNSSEC is properly configured for the domain, the output will include these additional records, demonstrating that DNSSEC validation can occur.

Using just "dig" alone wouldn’t provide the full context of DNSSEC functionality, as it would only return standard DNS records without any indication of DNSSEC signatures or validation status. While other commands like "nslookup" can perform DNS queries, they typically do not include DNSSEC-related outputs. The command "checkdnssec" is not a standard tool found in many DNS utilities, making "dig +dnssec" the correct choice when assessing DNSSEC performance for a domain.