GCIA · Question #11
You work as a network administrator for BlueWell Inc. You have to convert your 48-bit host address (MAC address) to an IPv6 54-bit address. Using the IEEE-EUI-64 conversion process, how do you convert
The correct answer is D. Add FF. FE between the third and fourth bytes. The IEEE EUI-64 process converts a 48-bit MAC address to a 64-bit interface identifier by inserting the hex value FF:FE between the third and fourth bytes of the MAC address.
Question
You work as a network administrator for BlueWell Inc. You have to convert your 48-bit host address (MAC address) to an IPv6 54-bit address. Using the IEEE-EUI-64 conversion process, how do you convert the 48-bit host address (MAC address) to an IPv6 54-bit address?
Options
- AAdd EF. FE between the third and fourth bytes.
- BAdd FE. EE between the third and fourth bytes.
- CAdd FF. EE between the third and fourth bytes.
- DAdd FF. FE between the third and fourth bytes
How the community answered
(52 responses)- A4% (2)
- B6% (3)
- C10% (5)
- D81% (42)
Why each option
The IEEE EUI-64 process converts a 48-bit MAC address to a 64-bit interface identifier by inserting the hex value FF:FE between the third and fourth bytes of the MAC address.
EF:FE is not the value specified by IEEE for EUI-64 expansion - only FF:FE is the standardized insertion value.
FE:EE is an incorrect value and does not correspond to any part of the IEEE EUI-64 specification.
FF:EE is incorrect - the second byte of the inserted value must be FE, not EE, per the IEEE EUI-64 standard.
In the EUI-64 process defined by IEEE and used in IPv6 stateless address autoconfiguration (SLAAC), the 48-bit MAC address is split after its first three octets (the OUI), and the two-byte sequence FF:FE is inserted at that midpoint to produce a 64-bit identifier. Additionally, the universal/local (U/L) bit - the seventh bit of the first byte - is flipped to indicate global uniqueness. FF:FE is the specific reserved value mandated by the IEEE specification for this purpose.
Concept tested: IEEE EUI-64 MAC to IPv6 interface identifier conversion
Source: https://www.rfc-editor.org/rfc/rfc4291#appendix-A
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