Discussion
Which of the following command is used to check the IP level connectivity?
Answer: D
The command that checks IP-level connectivity is Ping.
ping sends ICMP echo request packets to a host and waits for echo replies. A reply shows that the destination is reachable at the IP level and reports the round-trip time; no reply suggests a network or host problem.
The other commands are file-system commands. Deltree deleted a directory together with everything in it in old DOS versions, Dir lists the files in a directory, and Chkdsk checks a disk for file-system errors. None tests a network connection.
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