Get to Know More About What is a firewall? Its Work and types?

A firewall is a network security method that is used to monitors and controls incoming and outgoing traffic. The main purpose of its use is that it protects private networks and also prevents unauthorized use of private networks.

Firewalls have been the first line of defense in network security for over 25 years. They create a wall within secured and controlled internal networks that can be trusted and untrusted external networks, such as the Internet. A firewall can be both hardware, software. Palo Alto firewall is a next-generation security company, leading a new era in cybersecurity by enabling applications to safely and prevent cyber breaches.

There are 3 primary types of firewalls that are used by organizations to protect their data & devices to keep safe from harmful elements of the network, viz. Packet Filters, Stateful Inspection, and Proxy Server Firewalls. Here you can easily understand these three types by a brief introduction to each of these.

• Package Filter Firewall- Packet Filter Firewall manages the network access by analyzing the outgoing and incoming packets. It allows a packet pass or blocks its way by comparing it with pre-established rules like allowed IP addresses, packet type, port number, etc. The packet filtering method is suitable for small networks but gets complex when executed to larger networks.

• Stateful inspection firewall- Stateful Packet Inspection (SPI) is also called dynamic packet filtering, which is a powerful firewall structure that monitors traffic streams from end to end. These firewalls work at the network layer in the OSI model and it is more reliable, and secure than the basic packet filtering firewalls.
• Proxy Server Firewalls- It is also called the application-level gateways, Proxy Server Firewalls are the secured variety of firewalls that completely protect the network devices by filtering information at the application layer in the OSI model. Proxy firewalls hide your IP address and also limit traffic types. They provide a protocol-aware security analysis for the protocols they support. Proxy Servers offers the best Internet experience and results in network execution improvements.

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