routing in circuit-switching networks has traditionally involved a static routing strategy with the use of（71）paths to respond to increased load . modern routing strategies provide more adaptive and flexible approaches . the routing function of a packet-switching network attempts to find the least-cost route through the network , with cost based on the number of （72）,expected delay , or other metrics in virtually all packet-switching networks , some sort of adaptive routing technique is used . adaptive routing algorithms typically rely on the（73）of information about traffic conditions among nodes . in most cases , adaptive strategies depend on status information that is（74）at one place but used at another . there is a tradeoff here between the quality of the information and the amount of（75）. the exchanged information is itself a load on the constituent networks, causing a performance degradation.
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