200-301 · Question #1390
Refer to the exhibit. The IPv6 address for the LAN segment on router R2 must be configured using the EUI-64 format. When configured which ipv6 address is produced by the router?
The correct answer is D. 2001:db8:d955:1008:10D8:BAFF:FEC2:1. To configure an IPv6 address using EUI-64, the 48-bit MAC address is expanded to 64 bits by inserting 'FF:FE' in the middle and inverting the 7th bit of the first MAC address octet, then prepending the network prefix.
Question
Refer to the exhibit. The IPv6 address for the LAN segment on router R2 must be configured using the EUI-64 format. When configured which ipv6 address is produced by the router?
Exhibits
Options
- A2001:db8:d955:1008:12D8:BAFE:FF01:1
- B2001:db8:d955:1008:4598:785F:FE25:1
- C2001:db8:d955:1008:1030:ABFF:FECC:1
- D2001:db8:d955:1008:10D8:BAFF:FEC2:1
How the community answered
(44 responses)- A7% (3)
- B5% (2)
- C16% (7)
- D73% (32)
Why each option
To configure an IPv6 address using EUI-64, the 48-bit MAC address is expanded to 64 bits by inserting 'FF:FE' in the middle and inverting the 7th bit of the first MAC address octet, then prepending the network prefix.
This option represents an EUI-64 derived address that would result from a different MAC address after applying the conversion rules.
This option represents an EUI-64 derived address that would result from a different MAC address after applying the conversion rules.
This option represents an EUI-64 derived address that would result from a different MAC address after applying the conversion rules.
The EUI-64 process takes a 48-bit MAC address, inserts 'FF:FE' between the third and fourth octets, and inverts the 7th bit of the first octet. If the MAC address is 12:D8:BA:C2:00:01, applying these rules results in the interface ID 10D8:BAFF:FEC2:0001, which combined with the prefix 2001:db8:d955:1008::/64 yields 2001:db8:d955:1008:10D8:BAFF:FEC2:1.
Concept tested: IPv6 EUI-64 address generation
Source: https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.1
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