When generating a unique interface ID, the rules of EUI-64 are often used (eui-64). If the MAC address of an interface is 0000.1111.2222, what is the EUI-64 converted interface ID going to be?
A) 0000:11FF:FE11:2222
B) 0000:11FE:FE11:2222
C) 0200:11FE:FE11:2222
D) 0200:11FF:FE11:2222
D
Explanation: D) There are several steps to converting a MAC address to an EUI-64 interface ID:
1. Split the MAC address into two equal 6-byte parts.
2. Place the hex digits FFFE between the two parts.
3. From the left, take the seventh bit and invert it (if it was 0, it inverts to 1, and vice versa).
For this question, the MAC address is 0000.1111.2222:
1. 0000.11 11.2222
2. 0000.11FF FE11.2222
3. The seventh bit is 0. When converted to 1, the second hex digit becomes 2; 0020:11FF:FE11:2222.
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