To configure an IPv6 address using EUI-64, which command is correct?

When configuring an IPv6 address using EUI-64, the correct command involves incorporating the prefix and prefix length with the EUI-64 method directly in a standard IPv6 address format. The correct format emphasizes the structure of the IPv6 address with the prefix and prefix-length directly followed by the eui-64 designation. This command tells the device to automatically generate the host portion of the IPv6 address using the EUI-64 format based on the MAC address of the interface.

Using the command structure of "ipv6 address prefix/prefix-length eui-64" ensures that the configuration is aligned with Cisco command syntax, making it clear and effective for network administrators to implement. The EUI-64 method is widely used because it allows for the automatic generation of IPv6 addresses, which simplifies network management and configuration tasks.

The other options do not adhere to the appropriate command syntax or structure outlined for configuring EUI-64 addresses, making them unsuitable in this context.