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【单选题】
（3）处应填（）
A．2S/0.7C×R+2tPHY
B．2S/0.7C×R+tPHY
C．(2S/0.7C+2tPHY)×R
D．(2S/0.7C+tPHY×R
A.
在以太网的帧结构中，帧首定界符的长度为一个字节，其值为 (1) 。当以太网中数据传输率提高时，帧的传输时间要求按比例缩短，这样有可能会影响到冲突检测。为了能有效地检测冲突，应该 （2) 。当收发两站相距S，光速为C，网络的传输速率为R，发送站的物理层时延为t
PHY
，则发送站的最小帧长度为 (3） 。在100Base TX网络中，若两个DTE之间使用了2个中继器，则两个DTE间的最大跨距为 (4) 。
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A.
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B.
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A.
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B.
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C.
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D.
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