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Are They Watching You Online?

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What is a firewall and what does it do?

Nowadays, the levels of information a standard user deals with, have caused the unavoidable concern for having greater security, which would allow us to be protected from all the potential risks that are available in the world of the global Internet.


Been offline means to be deprived from the access to huge amounts of information, and there are several mechanisms made to ensure that surfing online is not a threat for you or for your PC.

One of these mechanisms is the Firewall, and this is precisely what it does in a matter of protecting your equipment, is establishes an intermediate stage (a wall) between the external net (Internet) and your PC.

In the market, a firewall might be a hardware (a device plugged between the PC and the connection to the Internet) or a program, which has to be installed and configured according to the needs of each user.


Even if it is a hardware or a software, firewalls were designed to establish restrictions in the Internet access, so infiltrations that could damage your PC’s output or some applications that might provide personal data without been authorized, are banned from it. In few words, the firewall is a filter for all the communications a PC could sustain with the outside, allowing or denying them through the Internet.

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By having a firewall installed in your PC, you are giving it the task of deciding whether an Internet web site is acceptable or not, this will happen after the configuration that each one of us must perform according to our preferences. But it must be clear that by just having a firewall not all our security problems are solved, the firewall only works through the Internet connection (protection against Trojans and Spyware), this is why it is obsolete against informatics viruses, files and software, hold in removable media, such as a CD or a Pendrive.


In a firewall’s configuration, you must choose between two types of decision behaviors or the so-called security policies:

Restrictive Policy or Behavior: Anything that has not been properly accepted or allowed will be denied. Explicit habilitation from every site will be required in order to be able of accessing it.
Permissive Policy or Behavior: Anything that has not been properly denied will be banned from access. It is necessary an isolation of each case for potential damages.

Usually, firewalls from a regular user follow the permissive behavior, but in the case of companies or enterprises, the use of the restrictive policy is suggested, to avoid greater losses of time in the continuous process of denying access to potential threats.

Do firewalls offer other advantages? Well yes, they do, and to sum up I must say that among the main ones you can find the following:

Protection from intrusions and identifications: the entrance will be restricted to all the users and it is only allowed after the identified user has accepted the entrance (this happens more often in the firewall systems used in organizations)
Protection for private information: For PCs with several users, it restricts the level of access to the net to each type of user.
Audit and using record: Allows the collection of data about the usage of the net. Data that allows knowing the hours in which the work is heavier, the wide of the broadband consumed, etc. It is an important option for companies.

To summarize, having a firewall in your PC is strongly recommended to save a few headaches; but the most important part is to read about the software you are about to install, so then you would not have to experience any dissatisfactions


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