Cisco Certified Network Associate (CCNA) Practice Exam

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Which command is used to enable IPv6 unicast routing on a router?

(config)#ipv6 routing
(config)#ipv6 unicast-routing
(config-if)#ipv6 enable
(config)#ip routing

The correct answer is: (config)#ipv6 unicast-routing

The command used to enable IPv6 unicast routing on a router is indeed "ipv6 unicast-routing." This command is essential as it allows the router to process and forward IPv6 packets, effectively enabling the routing of IPv6 traffic across the network. Without this command, a router can only support IPv4 routing and would not be able to handle IPv6 communications. The other commands, while related to IPv6 configurations, do not serve the purpose of enabling unicast routing. For instance, "ipv6 routing" is non-existent as a recognized command in Cisco syntax. On the other hand, "ipv6 enable" is used to enable IPv6 on an individual interface but does not activate routing capabilities, and "ip routing" pertains to enabling IPv4 routing rather than IPv6. Therefore, "ipv6 unicast-routing" is the correct command to ensure that IPv6 packets can be routed appropriately by the device.