单选

●宽带广域网络可采用 (54) 技术实现，其骨干网应选用 (55) 作为主要通信介质，节点之间的连接不宜采用 (56) 结构。
(54)

A． 100VG-AnyLAN &n
bsp; B． 1000BaseT
C． X.25
D． ATM (55) A．双绞线
B．同轴电缆
C．光纤
D．卫星 (56) A．双总线
B．星型
C．树型
D．网格型

试题出自试卷《2011年网络管理员考试考前密卷（三）-上午试题》

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●宽带广域网络可采用 (54) 技术实现，其骨干网应选用 (55) 作为主要通信介质，节点之间的连接不宜采用 (56) 结构。(54)

●宽带广域网络可采用 (54) 技术实现，其骨干网应选用 (55) 作为主要通信介质，节点之间的连接不宜采用 (56) 结构。
(54)