CCNA Routing and Switching (legacy) — Question 180

Which two statements about EUI-64 addressing are true? (Choose two.)

Answer options

• A. The address includes the hex digits FFFE after the last 24 bits of the interface MAC address.
• B. A 64-bit interface identifier is derived from the interface MAC address.
• C. A locally administrated address has the universal/local bit set to 0.
• D. A 96-bit interface identifier is derived from the interface MAC address.
• E. The address includes the hex digits FFFE after the first 14 bits of the interface MAC address.

Correct answer: A, C

Explanation

Option A is correct because EUI-64 format indeed includes FFFE between the MAC address segments. Option C is also correct, as locally administered addresses have the universal/local bit set to 0. Options B, D, and E are incorrect; B and D incorrectly state the identifier sizes related to MAC addresses, and E misplaces where FFFE is inserted in the addressing format.