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 (请作答此空)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 ( ) 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.hops
- B.sites
- C.members
- D.points
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