200-301 Question 114
Select 3A network administrator is configuring an IPv6 address on an interface using the EUI-64 method. The MAC address of the interface is 00:1A:2B:3C:4D:5E. Which of the following steps are performed to generate the IPv6 interface identifier using the Modified EUI-64 process?
- A
Split the MAC address into two 24-bit halves.
- B
Insert the hexadecimal value FFFF between the two halves of the MAC address.
- C
Insert the hexadecimal value FFEE between the two halves of the MAC address.
- D
Invert the 7th bit of the first octet of the MAC address.
- E
Add the network prefix to the modified MAC address to form the full IPv6 address.
Show answer and explanation
Correct answers: A, D, E
Explanation
The Modified EUI-64 process is used to generate the 64-bit interface identifier for an IPv6 address. The MAC address is split into two halves, and the 7th bit of the first octet is inverted. The value FFFE is inserted between the two halves to expand the MAC address to 64 bits. Finally, the network prefix is added to the interface identifier to create the full IPv6 address. Steps 1, 4, and 5 are correct according to this process.
- A. Correct.
Correct. The MAC address is split into two 24-bit halves as part of the EUI-64 process.
- B. Incorrect.
Incorrect. The correct insertion value is not FFFF but FFEE.
- C. Incorrect.
Incorrect. The correct value to be inserted is not FFEE.
- D. Correct.
Correct. The 7th bit of the first octet of the MAC address is inverted to comply with the Modified EUI-64 rules.
- E. Correct.
Correct. Once the interface identifier is generated, it is combined with the network prefix to form the complete IPv6 address.