200-301: Cisco Certified Network AssociateDemo

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QuestionQ902

IP Connectivity

A network engineer must configure IPv6 on the vlan 2000 interface to create a routable, locally unique unicast address that is prevented from being advertised to the internet.

Which configuration must the engineer apply?

  • A interface vlan 2000 ipv6 address ff00:0000:aaaa::1234:2343/64
  • B interface vlan 2000 ipv6 address fd00::1234:2343/64
  • C interface vlan 2000 ipv6 address fe80:0000:aaaa::1234:2343/64
  • D interface vlan 2000 ipv6 address fc00:0000:aaaa::a15d:1234:2343:8aca/64
Explanation

A Unique Local Address is the IPv6 unicast type intended for internal routing within a site or between limited sites while not being globally reachable on the Internet. RFC 4193 reserves FC00::/7 for Unique Local Unicast, and the locally assigned format used in practice is FD00::/8. FF00::/8 is multicast, and FE80::/10 is link-local and not routable off the local link. Therefore the correct configuration is the one using an FD00::/8 address.

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