Firewalls

Barriers that intercept and inspect network traffic to protect networks from unauthorized access.

Firewalls

Firewalls that operate at Layers 3 and 4 of the OSI network model and inspect attributes such as protocol, IP addresses, and port numbers to determine whether to allow or deny traffic.

Packet Filters

Devices that act as intermediaries between systems, changing IP addresses and port numbers to facilitate communication between networks.

Circuit-Level Gateways

Feature in firewalls that allows them to identify and track the connection state of conversations between computers, reducing the number of rules needed to support TCP communication.

Stateful Inspection

Firewalls that have the ability to inspect the contents of packets, providing a deeper level of inspection and preventing malicious traffic from entering the network unchecked.

Application Level