What kind of message does the "ping" command primarily use to check the reachability of a network device?
- ARP Request
- ICMP Echo Request
- TCP SYN
- UDP Packet
The "ping" command primarily uses ICMP Echo Request messages to check the reachability of a network device. It sends these messages to the target device, which should respond with an ICMP Echo Reply if it's reachable.
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