In the network shown in the figure, the BGP route learning among the routers is normal, and the BGP route attributes all take the default values.
After the route 9.0.0.0 is imported into BGP on RTD, if the next hop of route 9.0.0.0 on RTA is to point to RTC, the following adjustment methods are feasible: ______
What kinds of ICMPv6 messages are used in the duplicate address detection process of the ND protocol?