200-301 Question #1491: 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. When configured which ipv6 address is produced by the router?

Options

• A2001:db8:d955:1697:1130:ABFF:FECC:1
• B2001:db8:d955:1697:4657:149F:FE65:1
• C2001:db8:d955:1697:11D8:BFFF:FE69:1
• D2001:db8:d955:1697:12D8:BAFE:FF01:1

Explanation

This question asks to identify the IPv6 address generated using the EUI-64 format for a router's LAN interface, implying a specific MAC address from an unseen exhibit.

Common mistakes.

• A. This option contains an IPv6 address with a host identifier (1130:ABFF:FECC:1) that does not correspond to the EUI-64 conversion from the assumed MAC address for R2.
• B. This option presents an IPv6 address with a host identifier (4657:149F:FE65:1) that deviates from the correct EUI-64 format, indicating errors in either the FFFE insertion or the 7th bit inversion.
• D. This option contains an IPv6 address with a host identifier (12D8:BAFE:FF01:1) that would be derived from a different MAC address or an incorrect application of the EUI-64 conversion rules.

Concept tested. IPv6 Stateless Address Autoconfiguration (SLAAC) EUI-64 format

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic_config/configuration/xe-3s/ipv6-basic-config-xe-3s-book/ip6-eui64-format.html

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