What is the first step to convert a MAC address into an EUI-64 identifier?

To convert a MAC address into an EUI-64 identifier, the process starts with transforming the original MAC address format into a specific structure required for EUI-64. The correct first step is to divide the MAC address in half, as this lays the foundation for the subsequent modifications to the MAC address, incorporating the necessary elements for EUI-64 format.

In an EUI-64 identifier, the first half of the MAC address consists of the organizationally unique identifier (OUI), while the second half contains the vendor-specific part of the MAC address. This division is essential because it enables the insertion of the FFFE sequence between these two halves in the next step, providing the structure needed to complete the conversion process.

After the MAC address is divided, the two halves can be manipulated as required to produce the full EUI-64 identifier, including adjustments to the 7th bit and adding the FFFE, but dividing the address is the critical first action in this sequence.