Which of the following is a benefit of using EUI-64 for IPv6 addressing?

Using EUI-64 for IPv6 addressing provides the significant benefit of automatically mapping 48-bit MAC addresses into the IPv6 address space. This method simplifies the process of creating a unique IPv6 address for a network interface by taking the device's MAC address and expanding it into the necessary format for IPv6.

The EUI-64 format generates a 64-bit interface identifier, which allows for automatic address generation from existing hardware identifiers, facilitating easier and consistent address assignment without requiring elaborate manual configuration. This is particularly useful in large networks or environments where devices frequently join and leave, as it promotes efficiency and reduces potential errors associated with manual IP address assignments.

While the other options mention various concepts related to networking, they do not directly align with the specific benefits of the EUI-64 method. For instance, enhanced security features, when implementing EUI-64, are not inherently provided by this addressing scheme itself. Similarly, EUI-64 does not eliminate the need for subnetting or reduce the necessity for routing protocols, as these concepts serve different purposes within network management.