下一代网络(NGN)是以()技术为核心的开放性网络。
A.软交换
B.电路传输
C.功率控制
D.波分复用
参考答案:A
如图所示,为某一装置的俯视图,PQ、MN为竖直放置的很长的平行金属薄板,两板间有匀强磁场,它的磁感应强度大小为B,方向竖直向下,金属棒AB搁置在两板上缘,并与两板垂直良好接触,现有质量为m、带电量大小为q,其重力不计的粒子,以初速度v0水平射入两板间.问:
(1)金属棒AB应朝什么方向、以多大的速度运动,可以使带电粒子做匀速运动?
(2)若金属棒运动突然停止,带电粒子在磁场中继续运动,从这刻开始位移第一次达到mv0/(qB)时的时间间隔是多少?(磁场足够大)
Routing protocols use different techniques for assigning ______ to individual networks. Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal ______ . Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load ______ can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing. Per-packet load balancing distributes the ______ across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on ______.
A. balancing B. uploadingC. downloading D. transmitting