What are types of firewall

A firewall is a network security device that monitors incoming and outgoing network traffic. The main purpose of a firewall is to separate a secure area from a less secure area and to control communications between the two.  You can  perform a firewall in either hardware or software form, or a combination of both.now we want to see what is firewall and then to see What are types of firewall?

Infact firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or a combination of both. Firewalls prevent unauthorized Internetusers from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet (i.e., the local network to which you are connected) must pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

Packet filtering firewall

Packet filtering is a firewall technique that control network access and it can monitor outgoing and incoming packets

Stateful firewall

In computing, a stateful firewall is a network firewall that tracks the operating state and characteristics of network connections traversing it.

Deep packet inspection firewall

D eep packet inspection (DPI) is an advanced method of packet filtering that functions at the Application layer of the OSI.

Application-aware firewall

They can look at all the traffic going by and categorize those flows based on what the application happens to be.

Application proxy firewall

A proxy firewall is a network security system that protects network resources by filtering messages at the application layer.