What changes are necessary to application code in order to implement DNSSEC?
What changes are necessary to application code in order to implement DNSSEC?
To implement DNSSEC, no changes are necessary to the application code. DNSSEC operates at the DNS server level and ensures the authenticity and integrity of DNS responses using cryptographic signatures. The validation of these signatures and handling of DNSSEC records is managed by the DNS resolver, not the application itself. Therefore, applications can continue to function without modification, as the DNS layer will transparently provide the secured DNS responses.
In order to implement DNSSEC, some changes to application code may be necessary. DNSSEC is a security extension to the Domain Name System (DNS) that provides authentication for DNS lookups. To implement DNSSEC, application code may need to be updated to perform additional DNS lookups in order to verify the authenticity of DNS records. This may involve adding code to perform cryptographic operations in order to validate DNSSEC signatures. Therefore, the correct answer is option C, "Additional DNS lookups."
D. No changes are needed.
To facilitate signature validation, DNSSEC adds a few new DNS record types: RRSIG - Contains a cryptographic signature DNSKEY - Contains a public signing key DS - Contains the hash of a DNSKEY record NSEC and NSEC3 - For explicit denial-of-existence of a DNS record CDNSKEY and CDS - For a child zone requesting updates to DS record(s) in the parent zone.
It's very unlikely this question is asked just to be pointless and with no action needed. I think as per specified by contributor DA95, option C is correct.
DNSSEC (Domain Name System Security Extensions) is handled at the DNS infrastructure and resolver level, rather than at the application code level. As long as the underlying DNS resolvers and infrastructure support DNSSEC, applications typically don’t require any additional changes to start benefiting from the secure DNS lookups.