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 pack

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 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 （ 73 ） information about traffic conditions among nodes . in most cases , adaptive strategies depend n status information that is （ 74 ） at one place but used at another . there is a tradeoff here tween the quality of the information and the amount of （ 75） . the exchanged information itself a load on the constituent networks , causing a performance degradation
71 a . only b . single c . alternate d . series
72  a . hops b . sites c . members d . points
73. a . exchange b . transportation c . reception d . transmissio
74 a . rejected b collected c discarded d transmitted
75 a . packets b information c data d . overhead