You have noticed that a server with IP 145.45.3.2 doesn’t respond to requests. What command will you type first in order to test connectivity between your device and the server?

(A) request 145.45.3.2
(B) check 145.45.3.2
(C) ping 145.45.3.1
(D) ping 145.45.3.2

ping 145.45.3.2 is the correct answer. The ping command tests connectivity by sending packets to an IP address, expecting the device at that address to send packets back. The ping command uses the Internet Control Message Protocol (ICMP), specifically the ICMP echo request and ICMP echo reply messages.