200-301 Question #1140: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. The iPv6 address for the LAN segment on router R2 must be configured using the EUI-64 format. Which address must be used?

Options

• Aipv6 address 2001:DB8:D8D2:1009:10A0:ABFF:FECC:1 eui-64
• Bipv6 address 2001:DB8:D8D2:1009:1230:ABFF:FECC:1 eui-64
• Cipv6 address 2001:DB8:D8D2:1009:4347:31FF:FF47:0 eui-64
• Dipv6 address 2001:DB8:D8D2:1009:12A0:AB34:FFCC:1 eui-64

Explanation

The correct IPv6 address using EUI-64 format is derived by taking the interface's MAC address, inserting FFFE in the middle, and flipping the 7th bit of the first byte.

Common mistakes.

• B. This address's interface identifier 1230:ABFF:FECC:1 does not conform to the EUI-64 derivation rules from a standard MAC address (specifically, the 1230 part and the 1 at the end are inconsistent with common MAC structures).
• C. The interface identifier 4347:31FF:FF47:0 does not align with the EUI-64 formation by inserting FFFE and flipping the 7th bit based on typical MAC address patterns.
• D. The interface identifier 12A0:AB34:FFCC:1 shows AB34 before FFCC, which incorrectly places the FFFE insertion, making it inconsistent with the EUI-64 standard.

Concept tested. IPv6 EUI-64 address generation

Reference. https://www.cisco.com/c/en/us/support/docs/ip/ipv6/113333-ipv6-eui-64.html

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