单选

Split horizon has been enabled within the Ezonexam routed network. 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.
  • E.None of the above
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