200-301 Question 113
Single answerA network engineer is configuring an IPv6 address on a router interface using the Modified EUI-64 method. The router's MAC address is 00:1A:2B:3C:4D:5E. Which of the following is the correct IPv6 interface identifier generated using the Modified EUI-64 process?
- A
021A:2BFF:FE3C:4D5E
- B
001A:2B3C:4D5E:0000
- C
201A:2BFF:FE3C:4D5E
- D
001A:2BFF:3C4D:5E00
Show answer and explanation
Correct answer: A
Explanation
The Modified EUI-64 process is used to create the interface identifier for an IPv6 address from a MAC address. The MAC address is split into two halves, with 'FFFE' inserted in the middle. Additionally, the 7th bit of the first byte is inverted (Universal/Local bit). This results in the correct interface identifier being '021A:2BFF:FE3C:4D5E' in this scenario.
- A. Correct.
Correct. 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 inverted, changing 00 to 02.
- B. Incorrect.
Incorrect. This option does not include the 'FFFE' insertion and does not invert the 7th bit of the first byte.
- C. Incorrect.
Incorrect. This option inverts the 7th bit but incorrectly changes the first byte to 20 instead of 02, which is not valid for the Modified EUI-64 process.
- D. Incorrect.
Incorrect. This option incorrectly rearranges the MAC address and fails to follow the correct Modified EUI-64 formatting standards.