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Difficulty: EasyIPv6 Address Types and EUI-64

During the dynamic creation of an IPv6 interface identifier using the EUI-64 method, a 48-bit MAC address is split into two equal 24-bit halves. Which 16-bit hexadecimal value is inserted directly between these two halves?

  1. FFFEAnswer
  2. B
    FFFF
  3. C
    FE80
  4. D
    FFEE

Answer

FFFE
The standard IEEE EUI-64 process expands a 48-bit MAC address into a 64-bit interface identifier by inserting the specific 16-bit hexadecimal value FFFE directly into the center between the first 24 bits (OUI) and the last 24 bits (NIC specific extension), followed by inverting the 7th bit (Universal/Local bit).

Step-by-Step Solution

1
Identify the MAC address splitting point
The 48-bit MAC address is divided into two 24-bit (3-byte) halves.
EUI-64 requires extending a 48-bit MAC address to a 64-bit length by inserting 16 bits in the middle.
2
Determine the inserted hexadecimal value
The 16-bit hexadecimal value FFFE is inserted between the two 24-bit halves.
By standard definition (RFC 4291), FFFE expands the 48-bit MAC address to 64 bits.

Key Concept

EUI-64 Interface Identifier Derivation
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Topics

IPv6 Address Types and EUI-64

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