Answer :
Final answer:
To send five ICMP echo messages to a device with an IP address of 10.1.1.1 on a UNIX host, the correct command is 'ping -c 5 10.1.1.1'.
Explanation:
The correct command to send five ICMP echo messages to a device with an IP address of 10.1.1.1 on a UNIX host is Option B: ping -c 5 10.1.1.1. This command uses the '-c' option to specify the number of echo requests to send, in this case, five. The IP address of the device is provided as an argument after the command.
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