If you want to verify the uptime of a remote host named dns2.linuxacademy.com, which command should you use?

Using the command to ping a remote host, such as dns2.linuxacademy.com, is an effective way to verify its uptime. When you execute the ping command, it sends ICMP echo request packets to the specified host. If the host is up and operational, it will respond with echo reply packets, indicating that it is reachable and responsive over the network. This method provides not only confirmation of the host's presence but also gives information about the latency and packet loss in the connection, which can further inform you about the health of the host.

Other commands serve different purposes. Traceroute is used to identify the route packets take to reach a host, which is more focused on network routing rather than simply checking if a host is up. Using telnet can sometimes check connectivity to specific ports on a remote server, but primarily it is used for connecting to services rather than for a general uptime check. Curl is designed for transferring data from or to a server, typically over HTTP or other protocols, and while it can indicate if a web server is responding, it does not provide generalized uptime status like ping does.