问题:
A . Allows interfaces to share common IP addresses.
B . Allows an interface to remain up without the aid of keepalives.
C . Allows a router to send routing and not receive updates via that interface.
D . Allows a routing protocol to forward updates that is missing its IP address.
E . Allows a router to receive routing updates on an interface but not send updates via that interface.
● 参考解析
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