200-301 Question 116
Single answerA network engineer is configuring IPv6 on a router interface and needs to manually assign an IPv6 address with a Modified EUI-64 interface identifier. The MAC address of the interface is 00:22:68:9C:4E:56. What will be the resulting interface identifier portion of the IPv6 address?
- A
0222:68FF:FE9C:4E56
- B
0022:68FF:FE9C:4E56
- C
0222:68FE:FE9C:4E56
- D
0022:68FE:FE9C:4E56
Show answer and explanation
Correct answer: A
Explanation
In the Modified EUI-64 process, the MAC address is split into two halves, and 'FFFE' is inserted in the middle. Additionally, the 7th bit of the first byte is flipped to signify that this is a globally unique address. For the MAC address 00:22:68:9C:4E:56, the resulting interface identifier is 0222:68FF:FE9C:4E56.
- A. Correct.
Correct. Modified EUI-64 generates the interface identifier by inserting 'FFFE' in the middle of the MAC address and flipping the 7th bit of the first byte.
- B. Incorrect.
Incorrect. The 7th bit of the first byte (00) was not flipped, which violates the Modified EUI-64 process.
- C. Incorrect.
Incorrect. This option incorrectly modifies the MAC address and does not follow the Modified EUI-64 process.
- D. Incorrect.
Incorrect. This option also fails to flip the 7th bit of the first byte and incorrectly modifies the MAC address.