1. The user of Host1 wants to ping the DSL modem/router at 192.168.1.254. Based on the Host1 ARP table that is shown in the exhibit, what will Host1 do?
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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
Answer: B
解释一下:在下面的表中我们可以看到ARP表中有关于192.168.1.254的ARP条目,所以在这主机都只需要发送单播的ICMP包到DSL modem/router即可。
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