When an EUI-64 interface ID is generated from a MAC address, what occurs?

When an EUI-64 interface ID is generated, the 48-bit MAC address is split in half, and the hexadecimal value FFFE is inserted in the middle. Additionally, the seventh bit of the original MAC address (the universal/local bit) is inverted. This bit indicates whether the MAC address is globally unique (0) or locally administered (1). Inverting it ensures that the EUI-64 ID correctly reflects its global uniqueness. The interface ID is not a random value; it's derived systematically. FE80 is part of the link-local address prefix, not inserted into the interface ID itself. The MAC address is modified, not used directly.