While delving into the different ways in which different types of hosts by different vendors can support dual-stack implementations is beyond the scope of the CCNA exam requirements, as a future network engineer, it is imperative to understand how to implement dual-stack solutions in Cisco IOS software. In Cisco IOS routers, dual-stack operation is enabled by simply configuring both an IPv4 address and an IPv6 address on the router interface.
Multiple IPv4 addresses can be specified by appending the [secondary] keyword to the end of the ip address [address] [mask] interface configuration command. For IPv6, however, the . . .
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