In a lab, R1 connects to R2, which connects to R3. R1 and R2 each have several working interfaces, all assigned addresses in class A network 10.0.0.0. Router R3 has some working interfaces in class A net work 10.0.0.0, and others in class B network 172.16.0.0. The engineer experiments with the auto -summary command on R2 and R3, enabling and disabling the command in various combinations. Which of the following combinations will result in R1 seeing a rout e for 172.16.0.0/16, instead of the individual subnets of class B network 172.16.0.0?（） auto - summary on R2 and no auto - summary on R3。 auto - summary on R2 and auto - summary on R3。 no auto -summary on R2 and no auto- summary on R3。 no auto - summary on R2 and auto - summary on R3。
砌体填充墙框架结构在地震作用下顶点位移与建筑高度比的限制是（）。 1/500。 1/550。 1/600。 1/800。
Refer to the exhibit. Initially， LinkA is connected and forwarding traffic. A new LinkB is then attached between SwitchA and HubA. Which two statements are true about the possible result of attaching the second link？（） The switch port attached to LinkB will not transistion to up.。 One of the two switch ports attached to the hub will go into blocking mode when a BPDU is received.。 Both switch ports attached to the hub will transition to the blocking state.。 A heavy traffic load could cause BPDU transmissions to be blocked and leave a switching loop. 。 The switch port attached to LinkA will immediately transition to the blocking state.。
下列气体中不能燃烧的是（）。 焦炉煤气。 高炉煤气。 二氧化碳。
募集设立
路由器和计算机之间连接时，需要采用（）电缆。
