| Data packets flowing into and out of a network, which can be monitored and filtered for security purposes. |
A network security device that monitors and controls incoming and outgoing traffic based on set security rules. |
| These firewalls inspect packets transmitted between networks and use predefined rules to allow or block traffic based on IP addresses, ports, and protocols, providing a basic level of security. |
Predefined criteria that determine how traffic is allowed or denied through a firewall. |
| These firewalls act as intermediaries between users and the services they access, offering additional features like content filtering, logging, and anonymity through request and response management. |
These firewalls keep track of active connections and analyze the state of packets within the context of these connections, allowing for more sophisticated filtering compared to simple packet-filtering. |
| The originating IP address or range from which traffic is allowed or denied. |
A unique identifier for each firewall rule. |