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.