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?

A.
send a unicast ARP packet to the DSL modem/router

B.
send a Layer 2 broadcast that is received by Host2, the switch, and the DSL modem/router

C.
send Layer 3 broadcast packets to which the DSL modem/router responds

D.
send unicast ICMP packets to the DSL modem/router

Explanation:
When Host1 sends ICMP packets to the DSL modem/router for the first time, Host1 checks the
mapping between the target IP address and the MAC with APP cache and sends unicast ICMP
packets. If Host1 cannot find the mapping between the target IP address and the MAC, Host1
sends broadcast packets to find the MAC mapping the target IP address.
The ARP cache contains the MAC mapping the target IP address 192.168.1.254, so Host1 sends
unicast ICMP packets to the DSL modem/router.
When Host1 sends ICMP packets to the DSL modem/router