When diagnosing a problem where a host can't reach a remote host, you find that you can't ping the first router in the path, and the first router can't ping the host initiating the connection. Which of the following is not part of a reasonable plan for first-step diagnostics?
1) Check the network cables and connections
2) Verify the IP address configuration on the host and the first router
3) Restart the host and the first router
4) Check the firewall settings on the host and the first router