Some users are having a problem connecting to an application server on their local network. You go to their department and start to troubleshoot the problem by testing connectivity using the ping tool at one of the user workstations. You discover that you can ping the server successfully using its computer name, but pinging the computer's fully qualified domain name $($FQDN$)$ fails. As a result of these tests, which of the following can you determine is the most likely source of the problem?

EMI

DNS

ACL

DHCP