Users report that they are unable to connect to a server. An administrator confirms that it is unreachable across the network. Other administrators have been working in the server room throughout the day. <br /> Which of the following is the NEXT step the administrator should take?()
A、 Verify the configuration of the connected port on the network switch.
B、 Reboot the server.
C、 Install a new NIC on the server.
D、 Verify that network cables are connected.