单选题Which one of the following statements best explains the split horizon rule used in distance vector routing protocols?（）AOnly routers can split boundaries (horizons) between concentric networks.BEach AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.CNetworks can only remain fully converged if all information is sent out all active interfaces.DInformation about a route should not be sent back in the direction from which the original update came.EDistance vector protocols need fall back routers that are responsible for momentary loops.
单选题
Which one of the following statements best explains the split horizon rule used in distance vector routing protocols?（）
A
Only routers can split boundaries (horizons) between concentric networks.
B
Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.
C
Networks can only remain fully converged if all information is sent out all active interfaces.
D
Information about a route should not be sent back in the direction from which the original update came.
E
Distance vector protocols need fall back routers that are responsible for momentary loops.
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