单选题Which command must be globally enabled on a Cisco router to support IPv6?（）Aip routing ipv6Bipv6 unicast - routingCipv6 routingDip classlessEipv6 cef
单选题
Which command must be globally enabled on a Cisco router to support IPv6?（）
A
ip routing ipv6
B
ipv6 unicast - routing
C
ipv6 routing
D
ip classless
E
ipv6 cef
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