What are two recommended ways of protecting network device configuration files from outside network security threats (Choose two.)（）。

• A、Allow unrestricted access to the console or VTY ports
• B、Use a firewall to restrict access from the outside to the network devices
• C、Always use Telnet to access the device command line because its data is automatically encrypted
• D、Use SSH or another encrypted and authenticated transport to access device configurations
• E、Prevent the loss of passwords by disabling password encryption