When generating a unique interface ID, the rules of EUI-64 are often used (eui-64). If the MAC address of an interface is 08ce.1543.1845, what is the EUI-64 converted interface ID going to be?
A) 0ACE:15FF:FE43:1845
B) 08CE:15FF:FE43:1845
C) 08CE:15FE:FE43:1845
D) 0ACE:15FE:FE43:1845

Question

Quizplus · Accepted Answer

A) 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 08ce.1543.1845:
1. 08ce.15 43.1845
2. 08ce.15FF FE43.1845
3. The seventh bit is 0. When converted to 1, the second hex digit becomes A (the byte was 8 in hex, 1000 in binary; flip the third bit [seventh from the end]: 1010 is A in hex); 0ACE:15FF:FE43:1845.

When Generating a Unique Interface ID, the Rules of EUI-64