Which command can be used to test NAT configurations?

The command that can be used to test NAT configurations is the one that focuses on source NAT specifically. This command is designed to display detailed information about the Source NAT configuration on a Junos device, allowing administrators to verify that the NAT translations are set up correctly and functioning as expected.

Source NAT is used to translate private IP addresses to a public IP address before the traffic leaves the local network. By utilizing this command, network administrators can confirm that the correct mappings and rules are in place, ensuring outbound traffic from the local network is properly translated.

The other options relate to different aspects of NAT or do not exist in the Junos operating system. For example, commands focusing on destination NAT would provide insights into different configurations unrelated to the question, while a command that shows NAT statistics might not provide the specific information needed to verify the source NAT setup. Overall, selecting the command related to source NAT gives the most pertinent information for testing NAT configurations effectively.