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多选题
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
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