单项选择题

Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival.

A.echo
B.jitter
C.packet loss
D.digitized sampling

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Which VPN management feature would be considered to ensure that the network had the least disruption of service when making topology changes?（）

A. dynamic reconfiguration
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Which two of these are correct regarding the recommended practice for distribution layer design based on the following configuration?（）

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C. locations
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