We explain what a firewall is, what it is for and how this system works. In addition, the types that exist and the Windows firewall.
In computer science , and more specifically in telecommunications, it is understood by firewall (in English) or firewall to a system or device capable of allowing, limiting, encrypting or decoding communications traffic between a computer (or a local network) and the rest of the Internet, preventing unauthorized users or systems from accessing.
A firewall may well be physical or digital, that is, an apparatus or a piece of software , and in both cases it is only a first step of defense in the world of computer networks , indispensable but not sufficient to guarantee security against to cyber attacks and third party intrusion.
This type of technology borrows from the mechanism for fire prevention that is usually applied in green areas or in vulnerable buildings, and which consists of a wall or a wasteland area, free of any flammable content, which limits the indefinite expansion of the Fire in case of fire.
The precursors of the firewall emerged during the 1980s , when the Internet was still a recent field of knowledge and had not yet been considered the possible margin of damage through hacking or cyber terrorism.
Since the first massive cyber attacks by viruses and digital worms at the beginning of the following decade, digital protection has been getting better and better , at the rate at which new pieces of harmful software, known as malware, appear.
A firewall simply serves to interrupt unauthorized or suspicious connections between a computer or computer system, and the Internet. In this way the remote communication between malicious users ( hackers ) and the local system is cut , or between pieces of malware installed furtively on the system and the outside of the system, thus preventing it from operating as a spearhead in the cyber invasion.
It is, therefore, a guard who prevents the entry or exit of unauthorized or suspicious communications , based on discernment criteria that are updated from time to time.
Firewalls distinguish between permitted and dangerous or suspicious connections, based on different procedures, such as:
There are the following types of firewall:
The famous Microsoft operating system , called Windows, includes a firewall software among its automatic defense options. This option was included in the System Security Center from its XP Service Pack 2 version , seeking to offer greater control and defense of system stability for its users.
This firewall is updated along with the other Windows applications to be up-to-date on cyber threats, and is automatically activated unless there is some other antivirus or firewall software that has the connection management privileges, in which case the firewall of Windows will remain disabled.
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