Types of Firewall
A Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. At its most basic, a firewall is essentially the barrier that sits between a private internal network and the public Internet. A firewall's main purpose is to allow non-threatening traffic in and to keep dangerous traffic out. Different types of firewall explained.
A Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. At its most basic, a firewall is essentially the barrier that sits between a private internal network and the public Internet. A firewall's main purpose is to allow non-threatening traffic in and to keep dangerous traffic out. Different types of firewall explained.
- Hardware Firewalls: are security devices that represent a separate piece of hardware placed between an internal and external network. This type is also known as an Appliance Firewall.
- Software Firewalls: is installed on the host device. Since it is attached to a specific device.it has to utilize its resources to work. Therefore, it is inevitable for it to use up some of the system's RAM and CPU.
- Cloud Firewalls or firewall-as-a-service (Faas): is a cloud solution for network protection. Like other cloud solutions, it is maintained and run on the internet by third party vendors.
- Proxy Firewalls: It serves as an intermediate device between internal and external systems communicating over the internet. It protects a network by forwarding requests from the original client and masking it as its own.
- Circuit-Level Firewalls:Circuit-Level gateways are a type of firewall that work at the session layer of the OSI model, observing TCP (Transmission Control Protocol) connections and sessions.
- Stateful Inspection Firewalls :A stateful inspection firewall keeps track of the state of a connection by monitoring the TCP 3-way handshake.
- Packet-Filtering Firewalls : serves as an inline security checkpoint attached to a router or switch. As the name suggests, it monitors network traffic by filtering incoming packets
- The next-Generation firewall :is a security device that combines a number of functions of other firewalls. It incorporates pocket, stateful, and deep packet inspection.