Question
How is an EUI-64 format interface ID created from a 48-bit MAC address?
Group of answer choices
By prefixing the MAC address with 0xFF and appending 0xFF to it
By prefixing the MAC address with 0xFFEE
By appending 0xFF to the MAC address
By inserting 0xFFFE between the upper 3 bytes and the lower 3 bytes of the MAC address
Group of answer choices
By prefixing the MAC address with 0xFF and appending 0xFF to it
By prefixing the MAC address with 0xFFEE
By appending 0xFF to the MAC address
By inserting 0xFFFE between the upper 3 bytes and the lower 3 bytes of the MAC address
Answers
GPT-4o mini
The correct answer is:
**By inserting 0xFFFE between the upper 3 bytes and the lower 3 bytes of the MAC address.**
To create an EUI-64 format interface ID from a 48-bit MAC address, you take the 6 bytes of the MAC address, split it into two halves, and insert the 2-byte value 0xFFFE in between. Additionally, the universal/local (U/L) bit, which is the second least significant bit of the first byte of the MAC address, is inverted (1 becomes 0, and 0 becomes 1) to indicate whether the address is universally or locally administered.
**By inserting 0xFFFE between the upper 3 bytes and the lower 3 bytes of the MAC address.**
To create an EUI-64 format interface ID from a 48-bit MAC address, you take the 6 bytes of the MAC address, split it into two halves, and insert the 2-byte value 0xFFFE in between. Additionally, the universal/local (U/L) bit, which is the second least significant bit of the first byte of the MAC address, is inverted (1 becomes 0, and 0 becomes 1) to indicate whether the address is universally or locally administered.