A CDN provider needs to implement a solution that delivers services to customers using IPv4, IPv6, or both to ensure interoperability. Which of the following technologies is the most appropriate for this requirement?
Correct Answer: C
Dual stack is the most appropriate technology because it allows a device, network, or service to support IPv4 and IPv6 at the same time. In a dual-stack environment, systems can communicate with IPv4-only clients, IPv6-only clients, and clients that support both protocol versions. This is especially important for a CDN provider because customers may connect from many different networks, and not all networks have fully migrated to IPv6.
The CompTIA Network+ N10-009 objectives include IPv4 and IPv6 addressing concepts, network services, and interoperability methods. Dual stack is a common transition strategy because it does not require immediate removal of IPv4. Instead, both protocol stacks operate together while networks gradually adopt IPv6.
Quality of service is used to prioritize traffic, not to provide IPv4 and IPv6 interoperability. Automatic Private IP Addressing assigns a 169.254.x.x address when DHCP fails and applies to IPv4 link-local addressing.
Stateless Address Autoconfiguration allows IPv6 hosts to create their own IPv6 addresses, but it does not provide IPv4 and IPv6 coexistence by itself. Therefore, dual stack is the correct answer.