200-301 Question #1500: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. The IPv6 address for the LAN segment on router R1 must be configured using the EUI-64 format. When configured which ipv6 address is produced by the router?

Options

• A2001:db8:1a44:41a4:C081:BFFF:FE4A:1
• B2001:db8:1a44:41a4:C801:BEFF:FE4A:1
• C2001:db8:1a44:41a4:4660:592F:FE65:1
• D2001:db8:1a44:41a4:C800:BAFE:FF00:1

Explanation

The EUI-64 process generates an IPv6 interface identifier by taking a 48-bit MAC address, inserting 'FFFE' in the middle, and inverting the 7th bit of the first byte.

Common mistakes.

• A. This option does not correctly apply the EUI-64 conversion rules regarding the 7th bit inversion or the structure of FFFE insertion based on a typical MAC address.
• C. This option's interface identifier (4660:592F:FE65:1) deviates significantly from the EUI-64 rules, failing to incorporate 'FFFE' correctly or reflect the original MAC address segments.
• D. This option's interface identifier (C800:BAFE:FF00:1) incorrectly inserts 'BAFE' and 'FF00' instead of the standard 'FFFE' in the middle of the MAC address to form the EUI-64 identifier.

Concept tested. IPv6 EUI-64 address generation

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_ipv6/configuration/15-s/ipv6-15-s-book/ip6-eui64.html

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