Which one of the following statements

Which one of the following statements best explains the split horizon rule?（）

A Only routers can split boundaries (horizons) between networks in separate AS numbers.
B Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.
C Once a route is received on an interface, advertise that route as unreachable back out the same interface.
D Information about a route should never be sent back in the direction from which the original update came.

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分类：CCNA(640-801)题库

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