A user reports that they can no longer access the company's internal CRM system from their workstation, which was functioning correctly the previous day. No updates to the user's computer or network changes have been reported. As the network technician, your first step is to gather more information to understand the problem. What should be your initial action?
Replace the user's network cable as it may be faulty
Check the network switch for port security violations that might have disabled the port
Question the user to determine recent changes and activity
Run network diagnostic commands from a server to test connectivity to all network resources