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Cisco Certified Network Associate (CCNA) · Cisco
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c is correct
C. The seventh bit of the original MAC address of the interface is inverted. In the process of generating an EUI-64 address, the 48-bit MAC address of the interface is taken, 16 bits are inserted (usually zeros), and then the seventh bit is inverted. This results in a 64-bit EUI-64 address used in IPv6 for interface identification.
C is correct seventh bit inverted