Which two statements about EUI-64 addressing are true? (Choose two.)
Click on the arrows to vote for the correct answerA. B. C. D. E.
EUI-64 (Extended Unique Identifier-64) is a method of generating a 64-bit interface identifier (IID) from a 48-bit MAC address. This method is used in IPv6 to create a unique identifier for network devices. Here are the two statements that are true about EUI-64 addressing:
B. A 64-bit interface identifier is derived from the interface MAC address.
This statement is true. EUI-64 uses the interface MAC address to generate a 64-bit IID. The first 24 bits of the IID are taken from the MAC address. Then, the hex digits FFFE are inserted in the middle of the remaining 40 bits, and the universal/local (U/L) bit is inverted (set to 1 if it was 0, and vice versa). This results in a 64-bit IID that is unique within the local network.
A. The address includes the hex digits FFFE after the last 24 bits of the interface MAC address.
This statement is also true. As explained above, the hex digits FFFE are inserted in the middle of the remaining 40 bits of the MAC address to create the IID. This means that the FFFE comes after the last 24 bits of the MAC address.
To summarize, EUI-64 addressing is a method of creating a 64-bit IID from a 48-bit MAC address. The IID is unique within the local network and is used in IPv6 to identify network devices. The EUI-64 method involves taking the first 24 bits of the MAC address, inserting FFFE in the middle of the remaining 40 bits, and inverting the U/L bit.