Certified Secure Software Lifecycle Professional Practice Exam 2025 - Free Practice Questions and Study Guide

Authenticated denial of existence is a key aspect of DNSSEC that significantly enhances security within the DNS protocol. This feature allows a DNS server to provide cryptographic proof that a requested domain name does not exist. Instead of simply failing to find a record (which could be exploited by attackers to create false information about the domain), DNSSEC enables the server to respond with a signed assertion that specifically indicates the non-existence of a record. This integrity ensures the client can trust that the response reflects the true state of the DNS information without the risk of misinformation or insertion of malicious data.

The other options do not contribute directly to the core security enhancements offered by DNSSEC. Increased bandwidth allocation does not inherently improve security; rather, it might enhance performance or capacity. Automatic updates of DNS records focus more on the efficiency of record management than on security. Access control for DNS records can help to manage who can change DNS information, but it does not provide the same level of cryptographic assurance as authenticated denial of existence.