Joe, a user, cannot browse on the intranet to a particular web server by using the servername
given to him by the administrator. Joe asks a coworker for the IP address of the same server, and
is then able to access the webpage using the IP address. Which of the following is the MOST
likely cause of the issue?

A.
DNS is not configured correctly.

B.
HTTP is not working on the server.

C.
HTTP is not working on the client.

D.
The network router is down.

Explanation:

Domain Name System or DNS is use to translate a name into IP address. If the DNS server is not
configured correctly, it will not be able to provide translation.

http://www.howstuffworks.com/dns.htm