Answer:
He can determine if the network is operational with a ping to the IP address.
If this fails, it means this is a DNS issue.
He can also determine if a router is down between the source and the server
Explanation:
A successful ping to IP address indicates that the network is working and the web server is online. Failure means that the host cannot resolve the associated domain name.
Try the web server at 192.168.0.10 is reachable from the source host. A router is down between the source host and the server web-s1.cisco.com. There is a problem with the web server software on web-s1.cisco.com