CCNA: Cisco Certified Network Associate — Question 68

What is the expected outcome when an EUI-64 address is generated?

Answer options

• A. The interface ID is configured as a random 64-bit value
• B. The characters FE80 are inserted at the beginning of the MAC address of the interface
• C. The seventh bit of the original MAC address of the interface is inverted
• D. The MAC address of the interface is used as the interface ID without modification

Correct answer: C

Explanation

The correct answer is C, as generating an EUI-64 address involves modifying the original MAC address by inverting the seventh bit. Option A is incorrect because the interface ID is not random; it is derived from the MAC address. Option B is misleading because FE80 is not inserted into the MAC address itself, and option D is incorrect as the MAC address does undergo modification to create the EUI-64 address.