200-301: Cisco Certified Network AssociateDemo

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QuestionQ1186

IP Connectivity

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?

Question Image

  • A 2001:db8:9aa6:6aa9:C801:A6FF:FEA4:1
  • B 2001:db8:9aa6:6aa9:C081:A6FF:FF4A:1
  • C 2001:db8:9aa6:6aa9:C001:6AFE:FF00:1
  • D 2001:db8:9aa6:6aa9:4642:823F:FE47:1
Explanation

Using modified EUI-64, the 64-bit interface ID is built from the MAC address by inserting FFFE in the middle of the 48-bit MAC and inverting the universal/local bit in the first byte. For R2, ca-01-a6-a4-00-01 becomes c8-01-a6-ff-fe-a4-00-01, which is C801:A6FF:FEA4:0001. Appending that interface ID to the LAN prefix 2001:db8:9aa6:6aa9::/64 yields 2001:db8:9aa6:6aa9:C801:A6FF:FEA4:1.

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