●Communication networks can be classified in terms of their physical arrangement or (73) Three common (73) are the star,bus,and ring.
(73) A．structures
B．topologies
C．protocols
D．frames
●Communication networks can be classified in terms of their physical arrangement or (73) Three common (73) are the star,bus,and ring.
(73) A．structures
B．topologies
C．protocols
D．frames
B【解析】信息网络可以依据物理结构或拓扑结构进行分类，3个典型的拓扑结构是星形、总线型和环形。
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