By Bruno Pedrozo - Feito por mim,
CC BY-SA 3.0,
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Number one: FIREWALL
The word "Firewall" was first used by firefighters to describe a barrier to
prevent the spread of fire.
(3)
As the name indicated, Firewalls on computers also act as a barrier that
prevents malware sources from entering your computer. It controls the traffic
between your trusted, local network and the untrusted network, the internet.
(1)
As a result, only files that are accepted by the firewall will be able to enter
our computer, while others are rejected or dropped. Firewalls can identify a
package by looking at its heading, which is a description of the package, its
connections, which is how the package links to other packages or websites, and
the source that the package is coming from, which can be the type of the
website or its IP address.
(2)
You can alternate the firewall settings yourself according to your situation,
and depending on your settings, the firewall can take different actions towards
packages coming in to your computer. It can accept the package and let it in,
reject the package and reply "unreachable", or drop the package without
sending any reply. Firewalls can also control outgoing traffic being sent from
your computer, so is also important to set your outgoing settings to insure
that you can send files out properly.
(3)
Generally, a Firewall is very useful in preventing problems from entering your
computer, but it can also make mistakes. A common mistake is that a Firewall
might block some completely safe packages from entering, and the user would
have to change the settings or turn off the firewall temporarily.
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