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Which statement describes the rule of split horizon?()
A. Only routers can split boundaries (horizons) between concentric networks.
B. All distance vector protocols require fall back routers that may cause momentary loops as the topology changes.
C. Networks can only remain fully converged if all information about routers is sent out all active interfaces.
D. Information about a route should not be sent back in the direction from which the original update come.
Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.
在能见度不良时,可依据航标的声音来确定其位置。
A. 正确
B. 错误
民用建筑广泛采用的接地方式为()。
A. 三相三线制
B. 三相四线制
C. 三相五线制
D. 两相制