External access of raspberry pi

[BEGINNER QUESTION]

So, i wanted to make a physical backdoor from a raspberry pi 4 model b. When you plug it in an ethernet cable, power it on and just leave it there, it will run a bash script to automatically start a netcat listener. Is there a way to connect to it from a completely different network?

submitted by /u/errevs8
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from hacking: security in practice https://ift.tt/qrEcV4j

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