Circuit-level gateways are much like packet-filtering firewalls in that they quickly and easily check and approve or deny traffic. They do it without being heavy on resources, too. Circuit-level gateways work by verifying the transmission control protocol handshake. It doesn’t check the packet directly, so there is a risk of malware getting through. These are not the best ones to protect your business. https://www.extnoc.com/managed....-endpoint-security-s