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單項選擇題

On the assumption that every OSPF router in a particular area is configured with there is no loopback interface set?()

A. The IP address of the first Fast Ethernet interface.
B. The IP address of the console management interface.
C. The highest IP address among its active interfaces.
D. The lowest IP address among its active interfaces.
E. There will be no router ID until a loopback interface is configured.

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