An enterprise host generates an IPv6 Link-Local address on an Ethernet interface using SLAAC and the standard EUI-64 process. Which two statements regarding the resulting IPv6 address structure and generation rules are correct?
- The link-local prefix begins with , where the first 10 bits are fixed as binary .Cevap
- The 7th bit of the first byte (Universal/Local bit) in the MAC address is inverted from 0 to 1.Cevap
- CThe 16-bit hexadecimal value is inserted between the OUI and the vendor-assigned portion of the MAC address.
- DThe 7th bit of the first byte is set to 0 to indicate that the address is globally unique and universally administered.
Cevap
The correct statements are that IPv6 link-local addresses use the prefix FE80::/10 (first 10 bits fixed as 1111 1110 10) and that the EUI-64 process inverts the 7th bit (Universal/Local bit) of the first byte of the MAC address.
The IPv6 link-local address range is defined by RFC 4291 as starting with the prefix FE80::/10, which fixes the first 10 bits to 1111 1110 10. Additionally, when deriving a 64-bit interface identifier from a 48-bit MAC address using EUI-64, the 7th bit of the MAC address's first byte (the U/L bit) must be inverted from 0 to 1 for burned-in universal addresses.
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IPv6 Link-Local Address Architecture and EUI-64 Interface Identifier Derivation