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1.In ATM cell header, the VP and VC employ 24bit in UNI interface, and employ 28bit in NNI interface. Lookup in 28bit table is very hard and will consume large memory space.
UNI接口的ATM信元头中VPI、VCI一共占用24位,而NNI接口中占用更多,达到了28位,如何搜索28位长度的数据表会是一项相当艰巨复杂的任务,而且非常耗费内存空间。收藏指正
2.Routing table searches require only a look at a short string of data in the initial part of the packet, the header that tells a packet where to go.
搜寻路由表只须检查封包最前面的一小段资料,藉此辨识封包的目的地。收藏指正
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