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单选题
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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