200-301 Question #1390: Real Exam Question with Answer & Explanation

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.

Submitted by rachelw· Mar 5, 2026IP Connectivity

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?

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

Explanation

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.

Common mistakes.

A. This option represents an EUI-64 derived address that would result from a different MAC address after applying the conversion rules.
B. This option represents an EUI-64 derived address that would result from a different MAC address after applying the conversion rules.
C. This option represents an EUI-64 derived address that would result from a different MAC address after applying the conversion rules.

Concept tested. IPv6 EUI-64 address generation

Reference. https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.1

Topics

#IPv6 EUI-64#IPv6 addressing#Router configuration

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