300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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QuestionQ336

Layer 3 Technologies

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Refer to the exhibit. The network administrator has configured the branch router for IPv6 on interface E 0/0. The neighboring router is fully configured to meet requirements, but the neighbor relationship is not coming up.

Which action fixes the issue on the branch router and brings up the IPv6 neighbors?

  • A Disable OSPF for IPv4 using the no ospfv3 4 area 0 ipv4 command under the E 0/0 interface.
  • B Enable the IPv4 address family under the router ospfv3 4 process by using the address-family ipv4 unicast command.
  • C Disable IPv6 on the E 0/0 interface using the no ipv6 enable command.
  • D Enable the IPv4 address family under the E 0/0 interface by using the address-family ipv4 unicast command.
Explanation

This is OSPFv3 with address families. The interfaces are enabled for the IPv4 AF with 'ospfv3 4 area 0 ipv4', and IPv6 is enabled globally and per interface as required, but the router process 'router ospfv3 4' has no address-family configured. Until 'address-family ipv4 unicast' is entered under the OSPFv3 process, the IPv4 address family is not activated and no adjacency/routes form - choice B. Option D is invalid syntax: 'address-family ipv4 unicast' is a router-process command, not an interface command. Options A and C would disable the very configuration that is supposed to work. The existing key A is wrong.

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