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【单项选择题】

If the dispersion of a given fiber is 17ps/nm*km at 1550 nm and zero at 1310 nm， then what is the accumulated dispersion of an ITU wavelength after it travels 200 km？ （）

A、A. 0 ps/nm

B、B. 340 ps/nm

C、C. 200 ps/nm

D、D. 3400 ps/nm

E、E. More information is needed.

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第2题
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第3题
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第4题
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第6题
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第8题
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第9题
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第10题
[多选题] The network security policy requires that only one host be permitted to attach dynamically to each switch interface. If that policy is violated, the interface should shut down. Which two commands must the network administrator configure on the 2950 Catalyst switch to meet this policy? (Choose two.)（）

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