Disable the not-used network ports

Dear,

Sorry for troubling, could you share the way to scan the open ports in Jetson Nano, and also the way to disable not-used ports?

Thanks in advance.

This won’t change on a Jetson. Pretty much any Ubuntu 18.04 document (and most any Linux document in general) will describe this. For example, check this Google search for port scanning:
https://www.google.com/search?q=port+scan+from+%22ubuntu+18.04%22&source=hp&ei=GfCLYqGBBfiG0PEP3-CFwAk&iflsig=AJiK0e8AAAAAYov-KX9fglgBdCSjUHUkrZV7w9mrGACG&ved=0ahUKEwjh8erCvPb3AhV4AzQIHV9wAZgQ4dUDCAk&uact=5&oq=port+scan+from+%22ubuntu+18.04%22&gs_lcp=Cgdnd3Mtd2l6EAMyBQghEKABMgUIIRCgATIFCCEQoAEyBQghEKsCMggIIRAeEBYQHTIICCEQHhAWEB06DgguEIAEELEDEMcBEKMCOggIABCABBCxAzoFCAAQgAQ6DgguEIAEELEDEMcBENEDOgUILhCABDoLCC4QsQMQgwEQ1AI6EQguEIAEELEDEMcBEKMCENQCOgsILhCABBCxAxDUAjoFCAAQhgM6BggAEB4QFlAAWJU7YLRAaABwAHgAgAGOBYgBmB-SAQkwLjQuNC0yLjSYAQCgAQE&sclient=gws-wiz

Similar searches for either firewalling or disabling ports. Be sure to scan ports from outside if it is an outside attack you want to prepare for. Note that there may be a lot of ports open by default from inside, but perhaps already be disabled from the outside.

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