What is a firewall? - Concept, types and architectures


This text deals with one of the most important security options in computing environments: the firewall .

Introduction
Even people less familiar with technology know that the internet is not a danger-free “territory”. It is for this reason that it is important to know and use protection tools for computers and networks. This text deals with one of the most important security options in computing environments: the firewall .

In the next few lines, you will understand the concept of firewall, know its most common types and understand the reasons why these solutions are considered essential.

What is a firewall?
Firewall is a security solution based on hardware or software (most common) that, based on a set of rules or instructions, analyzes network traffic to determine which data transmission or reception operations can be performed. “Wall of fire”, the literal translation of the name, already makes it clear that the firewall fits into a kind of defense barrier. Its mission, so to speak, basically consists of blocking unwanted data traffic and allowing welcome access.

Basic representation of a firewall

To better understand, you can imagine a firewall as a condominium entrance: in order to enter, it is necessary to obey certain conditions, such as identifying yourself, being expected by a resident and not carrying any object that may bring security risks; to leave, you cannot take anything that belongs to the tenants without the proper authorization.

IT service technician work for computer software or hardware businesses, supporting clients with products. Usually, they provide system support internally to organizational employees.

In this sense, a firewall can prevent a series of malicious actions: malware that uses a certain port to install itself on a computer without the user knowing, a program that sends sensitive data to the internet, an attempt to access the network from computers unauthorized external controls, among others.

110 Puntos de vista