200-301 Question #1449: Real Exam Question with Answer & Explanation

The correct answer is D: 2001:db8:bd69:1469:11BE:BFFF:FEB9:1. An IPv6 EUI-64 address is derived from a 48-bit MAC address by inserting 'FFFE' in the middle and inverting the 7th bit of the first octet.

Submitted by tom_us· 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:bd69:1469:12D8:BAFE:FF01:1
B2001:db8:bd69:1469:1130:ABFF:FECC:1
C2001:db8:bd69:1469:4628:255F:FE32:1
D2001:db8:bd69:1469:11BE:BFFF:FEB9:1

Explanation

An IPv6 EUI-64 address is derived from a 48-bit MAC address by inserting 'FFFE' in the middle and inverting the 7th bit of the first octet.

Common mistakes.

A. This address does not follow the correct EUI-64 format as the 'FFFE' insertion and bit-flip logic are not consistently applied.
B. This address would be generated from a different MAC address and/or an incorrect application of the EUI-64 bit-flipping rule, leading to an incorrect prefix and interface ID.
C. This address would be generated from a different MAC address and/or an incorrect application of the EUI-64 bit-flipping rule, resulting in an incorrect prefix and interface ID.

Concept tested. IPv6 EUI-64 address formation

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/xe-3s/ipv6-xe-3s-book/ip6-eui64-fmt.html

Topics

#IPv6 EUI-64#IPv6 addressing#SLAAC

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