"ipv6 enable" command on the interface

Hello Guys,

What is the need of the command "ipv6 enable" on the interface?

I've checked the Cisco command reference and found out the following:

To enable IPv6 processing on an interface that has not been configured with an explicit IPv6 address, use the ipv6 enable command in interface configuration mode. To disable IPv6 processing on an interface that has not been configured with an explicit IPv6 address, use the no form of this command.

Usage Guidelines

The ipv6 enable command automatically configures an IPv6 link-local unicast address on the interface while also enabling the interface for IPv6 processing. The no ipv6 enable command does not disable IPv6 processing on an interface that is configured with an explicit IPv6 address.




The most important question, according to the scope of the lab exam, when should we consider the missing of the command "ipv6 enable" is a fault and should be corrected and when not?


Thanks