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Difficulty: EasyIPv6 Address Types and EUI-64

A host network interface is configured with the MAC address 0011.2233.4455. When the host generates a 64-bit IPv6 interface identifier using the standard EUI-64 process, which value is created?

  1. 0211:22FF:FE33:4455Answer
  2. B
    0011:22FF:FE33:4455
  3. C
    0211:22FF:FF33:4455
  4. D
    0011:22FF:FF33:4455

Answer

The interface identifier created using EUI-64 is 0211:22FF:FE33:4455.
The correct answer properly demonstrates both required steps of the EUI-64 derivation: inserting the 16-bit hexadecimal sequence FFFE into the middle of the 48-bit MAC address and inverting the 7th bit (Universal/Local bit) of the first byte from 0 to 1 (changing 0x00 to 0x02).

Step-by-Step Solution

1
Split the 48-bit MAC address into two 24-bit halves.
Left half: 00-11-22, Right half: 33-44-55
EUI-64 requires inserting a 16-bit hexadecimal marker in the middle of the MAC address.
2
Insert hexadecimal FFFE into the middle between the two halves.
00-11-22-FF-FE-33-44-55
The EUI-64 standard specifies FFFE as the constant padding value to expand a 48-bit MAC address to 64 bits.
3
Invert the 7th bit (Universal/Local bit) of the first byte.
First byte 00 (00000000 in binary) becomes 02 (00000010 in binary). Combining and formatting into IPv6 hex quads produces 0211:22FF:FE33:4455.
Inverting the 7th bit changes the scope from globally unique (0) to locally managed (1) for EUI-64 derived addresses.

Key Concept

EUI-64 Interface ID Generation
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Topics

IPv6 Address Types and EUI-64

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