routing in circuit-switching networks has traditionally involved a static routing strategy with the use of （ ） 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 （ ）expected delay , or other metrics in virtually all packet-switching networks , some sort
adaptive routing technique is used . adaptive routing algorithms typically rely on the （请作答此空） information about traffic conditions among nodes . in most cases , adaptive strategies depend status information that is （ ） at one place but used at another . there is a tradeoff here tween the quality of the information and the amount of （ ） . the exchanged information itself a load on the constituent networks , causing a performance degradation
- A.exchange
- B.transportation
- C.reception
- D.transmission
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