You are a desktop support technician for your company. The network consists of an Active Directory domain that contains a DNS server. All servers run Windows Server 2003, and all client computers run Windows XP Professional.
A user reports that his client computer is not able to connect to any network resources and is not able to authenticate to the Active Directory domain. The computer was able to connect yesterday. No other users are reporting a problem today.

You examine the computer’s physical connection to the network. You verify that the connection is correct and that the computer’s network adapter displays a link light. The computer is configured to use the following IP configuration:

.IP address: 192.168.0.102
.Subnet mask: 255.255.255.0
.Default gateway: 192.168.0.1

You confirm that this configuration is valid on the network.

You need to troubleshoot the problem.

What should you do?

A.
Instruct the user to run the ping loopback command.

B.
Instruct the user to run the ipconfig /all command.

C.
Ensure that the computer is configured to use a valid DNS server address.

D.
Ensure that the computer is configured to have a valid Hosts file.