I have an IOT music system that uses an internet service for internet radio. I discovered device has several open ports which seem to have insecure in caps. In particular, it uses the BSD shell on an open Port 514. Other open ports are 8080, and just recently I noticed that port 80 was added(!). Since the BSD function doesn't require a password to login, I'd like to use the safest way to secure the device. I can link it to my guest network, and I think isolate it from any other devices that might also use the network (there are none currently). Would that work to secure the device from my LAN?