【简答题】
A、A.modem没有检测到DSL信号 B、B.电话线被插到DSL插口 C、C.电脑的连接信号丢失 D、D.modem的电源信号没有开
A、send a unicast ARP packet to the DSL modem/router B、send unicast ICMP packets to the DSL modem/router C、send Layer 3 broadcast packets to which the DSL modem/router responds D、send a Layer 2 broadcast that is received by Host2, the switch, and the DSL modem/router