Packet Filter, Examines individual packets of data and makes access decisions based on specifics, as they traverse a network., Stateful Inspection, Monitors and evaluates the state of active connections by maintaining a table of established sessions. It makes intelligent access decisions by tacking the context of ongoing communications., Application-Level, Intercepts and inspects communication between applications. It can provide granular control over specifics, filter content, and serve as an intermediary to protect the internal network., Circuit Level Gateway, Works at the transport layer, creating a virtual connection for application communication. It doesn’t inspect the actual content of the data but manages the connections between systems, offering a level of security by controlling access based on network addresses and ports., Network Address Translation, A technique used to modify network address information in packet headers while in transit, typically to allow multiple devices on a local network to share a single public IP address., Port Address Translation, Private IP addresses are translated into the public IP address via Port numbers. PAT also uses IPv4 address but with port number., Web Proxy, A server that filters and limits access to undesirable, forbidden, or dangerous content. Used by schools and workplaces to filter where users are allowed to go on the Internet., IDS, A security tool designed to monitor network or system activities, identify suspicious patterns, and raise alerts for potential security incidents., IPS, Actively blocking or preventing identified threats in real-time, enhancing the security posture by automatically responding to potential attacks..

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