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Zorluk: KolayIPv6 Address Types and EUI-64

Which two modifications are performed on a 48-bit MAC address when generating a 64-bit IPv6 interface identifier using the EUI-64 process? (Select TWO.)

  1. The 16-bit hexadecimal value FFFE is inserted into the middle of the MAC address.Cevap
  2. The 7th bit (Universal/Local bit) of the first byte of the MAC address is inverted.Cevap
  3. C
    The 16-bit hexadecimal value FFFF is inserted into the middle of the MAC address.
  4. D
    The first 24 bits of the MAC address are overwritten by the prefix FE80.

Cevap

Generating an IPv6 EUI-64 interface identifier requires inserting the 16-bit hexadecimal value FFFE into the middle of the 48-bit MAC address and inverting the 7th bit (Universal/Local bit) of the first byte.
The standard EUI-64 process creates a 64-bit interface ID from a 48-bit MAC address by inserting the 16-bit hexadecimal value FFFE between the OUI and vendor-assigned portion, and inverting the 7th bit (Universal/Local bit) of the first byte.

Adım Adım Çözüm

1
Split the 48-bit MAC address into two 24-bit halves.
The Organizationally Unique Identifier (OUI) forms the upper 24 bits and the NIC extension forms the lower 24 bits.
EUI-64 requires extending the address length at its midpoint.
2
Insert FFFE between the two 24-bit halves.
The address expands from 48 bits to 64 bits.
FFFE acts as the designated padding delimiter specified by IEEE and IPv6 standards.
3
Invert the 7th bit (Universal/Local bit) of the first byte.
If the 7th bit was 0 (indicating a burned-in MAC address), it becomes 1 in the IPv6 interface identifier.
IPv6 standardizes global uniqueness by setting the U/L bit to 1 for universally unique interface IDs.

Anahtar Kavram

EUI-64 Interface Identifier Derivation
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Konular

IPv6 Address Types and EUI-64

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