In construction, a firewall is a non-flammable wall that prevents
fires from spreading throughout a building. Homes, for example, may
have a firewall between the garage and the rest of the house to prevent
garage fires from threatening other rooms.
With the rapid popularization of the internet, the term firewall
is more commonly used in computer networking. Like the firewalls used
in homes and buildings, computer firewalls act as a barrier between
computers on a network. For companies with a computer network or for
individuals with a permanent connection to the internet (such as
through DSL or cable), a firewall is critical. Without a firewall,
intruders on the network would likely be able to destroy, tamper with
or gain access to the files on your computer.
Firewalls can come in the form of hardware or software. Without
getting into the complex details of how firewalls work, suffice it to
say that function with a set of filters that are constantly monitoring
traffic on the network. Whenever a packet of information triggers one
of the filters, the firewall prevents it from passing through in the
attempt to prevent damage. Of course, firewalls sometimes block wanted
traffic, and through a continual process of refinement, the filters can
be customized to improve their efficacy.
Many computer users who access the internet via a broadband router,
may already be benefitting from a firewall. The router itself may be
configured to serve as a firewall; any nefarious attacks from the
network, are halted at the router thereby sparing any ill effects to
the computer. Such a hardware firewall can be further bolstered with a
secondary line of defense in the form of a software firewall; you can
never be too safe when using the internet!
If you would like more detailed information regarding firewalls, how
they work or how to configure them, etc. please visit the link provided
in the source section below.
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