Cisco Certified Network Associate (CCNA) Practice Exam

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Which command initiates the IPv6 unicast routing feature on a router?

ipv6 address enable
ipv6 routing
ipv6 unicast-routing
enable ipv6 routing

The correct answer is: ipv6 unicast-routing

The command that initiates the IPv6 unicast routing feature on a router is "ipv6 unicast-routing." This command is specifically required to enable IPv6 routing on a Cisco router. When you enter this command in global configuration mode, it activates the processes necessary for the router to forward IPv6 packets. Enabling this feature is a crucial step because, by default, most Cisco routers do not have IPv6 routing enabled. Without this command, the router will not route IPv6 traffic, although it might still be able to handle IPv6 addresses on interfaces. This feature is essential for allowing the router to participate in IPv6 networks and handle routing protocols designed for IPv6. The other options either mislabel the command or do not achieve the intended outcome of enabling IPv6 routing on the router. Hence, "ipv6 unicast-routing" is the correct choice for activating this important capability.