200-301 Cisco Certified Network Associate (CCNA)

Which command automatically generates an IPv6 address from a specified IPv6 prefix and MAC address of an interface?

  • A. ipv6 address dhcp
  • B. ipv6 address 2001:DB8:5:112::/64 eui-64
  • C. ipv6 address autoconfig
  • D. ipv6 address 2001:DB8:5:112::2/64 link-local
Answer: Option C.
Explanation: 

The “ipv6 address autoconfig” command causes the device to perform IPv6 stateless address auto-configuration to discover prefixes on the link and then to add the EUI-64 based addresses to the interface. Addresses are configured depending on the prefixes received in Router Advertisement (RA) messages. The device will listen for RA messages which are transmitted periodically from the router (DHCP Server). This RA message allows a host to create a global IPv6 address from:
• Its interface identifier (EUI-64 address)
• Link Prefix (obtained via RA)
Note: Global address is the combination of Link Prefix and EUI-64 address

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