Which command creates an IPv6 address from a given prefix using an interface MAC via EUI-64?
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Correct answer: ipv6 address 2001:DB8:5:112::/64 eui-64.
Why this is the answer
The ipv6 address 2001:DB8:5:112::/64 eui-64 command correctly configures an IPv6 global unicast address on an interface using the specified prefix and automatically generating the host portion of the address from the interface's MAC address via the EUI-64 process. This method ensures a unique interface identifier within the subnet. ipv6 address dhcp would configure the interface to obtain its IPv6 address from a DHCPv6 server, not using EUI-64. ipv6 address autoconfig enables stateless autoconfiguration (SLAAC), which typically uses EUI-64 or a randomly generated interface ID, but it doesn't allow you to specify a prefix; it expects to learn the prefix from a router advertisement. ipv6 address 2001:DB8:5:112::2/64 link-local is incorrect because link-local is not a valid keyword for configuring a global unicast address, and ::2 manually specifies the host portion, not EUI-64. Link-local addresses are automatically generated or can be manually configured with the link-local keyword, but they use a different prefix (FE80::/10).
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