A. You should follow the policy established by the network administrator for your business, school, or organizational network. In some cases, network administrators may configure all computers on the network so that you cannot turn on the firewall while your computer is connected to the network. The check box to turn on the firewall in the Windows Security Center or in the Network Connection Properties dialog box will be dimmed. In those cases, you should ask your network administrator for guidance on whether you need a firewall on your computer.