There are different types of firewalls specialized to do so. It includes:
- Packet filtering firewalls
- Circuit-level gateways
- Stateful inspection firewalls
- Application firewalls
- Proxy firewalls
- Next-generation firewalls.
A packet filtering firewall provides a perimeter security system. It deflects harmful traffic at the router. It gets data on IP address, port number, and packet type by inspecting data packets. On inspection, if the security standards are not met, the packets will not be allowed to move forward by the firewall. They process the data very quickly.
Circuit-level gateways track the TCP between packets. They do so to find out if it is a valid session or not. Traffic will depend on session policies. These firewalls do not look for the packets they are transmitting, which means malicious packets are expected to be missed.
A stateful inspection firewall looks for each packet in TCP session. It can accept/reject traffic depending on security policy and prior activity data. It has more control than packet filtering firewalls but is comparatively slower.
An application or proxy firewall filters out the traffic at the application layer. It works on origination point of traffic and looks for harmful data, policy breaching, viruses etc.
Next-generation firewalls are the latest security firewalls. They have accumulative properties of packet filtering and stateful inspection along with deep packet inspection and encrypted traffic inspection.
The upcoming firewalls are expected to be more advanced. The firewall is very much important for the secure network. To make your networks more secure, consult Logic Finders that amazingly provide these services for better infrastructure.