routing in circuit-switching networks has traditionally involved a static routing strategy with the use of (1) 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  (2) ,expected delay , or other metrics in virtually all packet-switching networks , some sort f adaptive routing technique is used . adaptive routing algorithms typically rely on the (3) information about traffic conditions among nodes . in most cases , adaptive strategies depend n status information that is (4) at one place but used at another . there is a tradeoff here tween the quality of the information and the amount of (5) . the exchanged information itself a load on the constituent networks , causing a performance degradation.

(1)A.only

B.single

C.alternate

D.series

(2)A.hops

B.sites

C.members

D.points

(3)A.exchange

B.transportation

C.reception

D.transmissio

(4)A.rejected

B.collected

C.discarded

D.transmitted

(5)A.packets

B.information

C.data

D.overhead

信管网参考答案：C、A、A、B、D

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