Hi Inquirer,
As peterweb said, network trust levels configure how the firewall monitors and controls traffic from your local network only, not the internet. "Restricted" completely blocks communication from any other device on your network, "Protected" allows communication, but applies the same rigorous firewall rules that are enforced for internet traffic, "Shared" permits some additional specific protocols that allow easier communications among devices on the local network, and "Full Trust" allows unrestricted local traffic while maintaining IPS monitoring for known threats.