Firewall – Introduction, Works, Types, and More

Introduction

A firewall is a network security device that monitors the flow of data to and from your computer through the networks it connects to, allowing or preventing data from passing through and from it based on a set of pre-defined security rules.

Its purpose, of course, is to create a barrier between your computer or internal network. And the external network to which it communicates by trying to prevent the movement and transit of harmful data such as viruses or piracy attacks.

How does the Firewall Works?

Firewalls analyze incoming and outgoing data based on pre-defined rules, filtering data from unsafe or suspicious sources. Preventing possible attacks on your computer. Or connected computers on your internal network, i.e., guards at computer hotspots—so-called ports, where data remains exchanged with external devices.

Types of Firewalls?

Firewalls can be either software or hardware, and it is better to own both types. Software firewalls are software that demonstrates each

A computer for its work in regulating data transit through ports and applications. Hardware firewalls are physical devices placed between the external network. And the computer you connect, i.e., the link between your computer and the external network.

The Most Common Types of Firewalls

It checks data packets and prevents their passage if they do not match the security rules already included in the firewalls. This type scans the source of their devices’ data packets and IP addresses for this matching process.

Second-Generation Firewalls

Its design includes traditional firewall work technology and other functions such as encrypted transit screening, intrusion prevention systems, anti-virus systems. And dpi deep data packet inspection. While conventional firewalls scan data packet heads, dpi’s 2g firewalls explore and accurately examine data within the package. Enabling users to know and identify harmful containers more effectively.

Proxy Firewall

This type of firewall works at the application level. However, the rest of the firewalls act as an intermediary between the two ends of a system. The customer who adopts it has to send a request to the firewall of this type to remain evaluated following a set of security rules to allow/prevent the passage of the Taliban forwarded for evaluation.

What distinguishes this type is that it monitors data traffic following the protocols of the so-called seventh tier, such as HTTP and FTP. And has the advantage of deep examination of DPI data packets and formal or tasteful firewall work techniques.

Network Address Translation (NAT) Firewall

These walls allow multiple devices with different IP addresses to connect to external networks with a single IP address, so attackers. Who rely on their attacks to scan the web on IP addresses.

It cannot obtain specific details about devices protected by this type of firewall. This type resembles proxy firewalls in that they act as an intermediary between the total devices they support and the external network.

Stateful Multilayer Inspection (SMLI) Firewalls

It filters data packets at the point-of-contact and application levels by comparing them to pre-known and reliable data packets, as in new firewalls. Short scans the entire data package, allows it to cross if it exceeds all layers and test levels and determines the type and status of the connection to ensure that all communications initiated are made only with reliable sources.