Final answer:
To test changes to an example policy without affecting production machines, set up a test environment that mimics the production environment and observe the effects of the changes in the test environment.
Step-by-step explanation:
To test changes to an example policy without affecting production machines, you should first set up a test environment that mimics the production environment as closely as possible. This includes using the same hardware, software, and network configurations. Once the test environment is ready, you can apply the changes to the example policy and observe the effects in the test environment. This way, you can ensure that any potential issues or breakages are identified before making changes to the production machines.