What is a Firewall? Learn all about it in this article

No one is free from evil, since evil never rests.” Superman, justice lovers and the great religious communities who fight against evil know this. Everyone does it their own way. Haven’t you wondered how your computer or other computing devices do it? Think about it: they don’t come from another planet, they don’t wear tights; they haven’t read it in a book, nor have they learned a couple of karate lessons in case things get violent. No, computer devices have their own tricks to fight evil. And… what is a Firewall?

What is a Firewall? Definition

A “firewall“, is a system to protect and safeguard the integrity of our computer, or a complete network of computers. It does this by stopping possible intrusions from third party networks, which explicitly enter via the Internet.

A firewall, as a system, filters the data packets that pass through the network. Imagine a kind of sieve that screens the traffic that exists between the internal network and the external network.

A firewall is an intermediary and can exist in the form of software as a program or in the form of hardware as a computer. In any case it will act as a mediator between our network and one or more external networks. It allows or denies transfers from one network to another. If you look at it another way, more like James Bond, it’s like a kind of security device to prevent intruders from accessing sensitive and confidential information.

What is a Firewall? How it works

In order for the firewall to do its job well, it needs to contain, in advance, a series of configured and defined rules. Thus, you can authorize a connection or deny or block a connection, redirect a request for a connection without informing the sender, and so on.

It all depends on how you want the custom package. I mean, as you want to customize this set of previous rules, so will your firewall. It needs some orders to act, stop or cross the border. Depending on your security policy, that’s what your firewall will look like.

Normally we can find two types of security policy: one that consents only to communications that are explicitly authorized, and another that stops any type of communication that was particularly prohibited.
The first of the ways is the one considered the safest. However, it requires an effort to define concisely the needs and criteria of the whole network.

What is a Firewall? Importance

To install the competent firewall together with a good antivirus in our computer is one of the main aspects to obtain a good quality security. Especially if we are open, as is normal, to the Internet, always so full of dangers.

The firewall raises a mystical firewall between our most private data and the evil foreign threats that will not wait to attack us when we are introduced in the network.

So if you’re wondering: “Wow, do I need a firewall? Is it really indispensable?“, the answer is “YES!”, “of course”. This one is totally devised to protect our computer of all type of assaults, threats, malwares of all ralea. They go from computer to computer with a bad idea and infecting what they can through the Internet to get to your computer and take control. Hackers, who really exist, are not just scapegoats for futuristic movies of the eighties, they want to enter your computer and take control of it to cisco your personal data or hard drive. Firewalls also stop outbound traffic and don’t let certain protocols be used to spread the viruses you may have on your computer.

As you may have considered, a firewall cannot stop all attacks and offensives, but without one of them on your computer you will only have to connect to the network so that, in a short time, you will be infected with the worst blight that floats on the Internet. Hairy and zoomorphic monsters such as viruses, spams, spyware…

Nothing can guarantee us 100% security today. But the greater the number of barriers and inconveniences that we put to the trash that moves through the Internet wishing to infect us, the better. Even in the most secure networks, business or institutional type, we have to have our firewall activated by what may happen. When it comes to protection with your computer, there’s no other kind of determination. Use firewall.

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