200-301: Cisco Certified Network AssociateDemo

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QuestionQ1279

IP Connectivity

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Refer to the exhibit.

The IPv6 address for the LAN segment on router R2 must be configured by using the EUI-64 format. When it is configured, which IPv6 address is generated by the router?

  • A 2001:db8:d945:91:12A0:AB34:FFCC:1
  • B 2001:db8:d945:91:11B0:ABFF:FECC:1
  • C 2001:db8:d945:91:4661:59FF:FF53:5
  • D 2001:db8:d945:91:1130:ABFF:FECC:1
Explanation

Modified EUI-64 creates the 64-bit interface ID from the interface MAC address by inserting FF:FE in the middle of the 48-bit MAC and inverting the universal/local bit in the first byte. Using R2's 13-b0-ab-cc-00-01 gives 11-b0-ab-ff-fe-cc-00-01, which becomes interface ID 11B0:ABFF:FECC:0001. Appended to the LAN prefix 2001:db8:d945:91::/64, the resulting IPv6 address is 2001:db8:d945:91:11B0:ABFF:FECC:1.

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