单项选择题


Based on the paragraph above，it is shown that in order to deploy IPv6 protocol on the Internet，（）has to be built.The network devices which need to communicate with both networks are required to have upgraded software or translator facilities in the movement of IPv4 to IPv6 transition，network infrastructures are relatively slow in this event.

A.separated network
B.mobile network
C.access network
D.radio network

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单项选择题
As with all ITU standards，reduce energy consumption is a key factor taken into account at development stage.Indeed NGN sare believed to offer significant saving（）traditional networks.

A.of
B.over
C.at
D.in
单项选择题
The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related to the bandwidth inhertz，and the （） on the channel.

A.signal frequency
B.bandwidth
C.carrier frequency
D.noise frequency
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