is a term almost every computer user might have at least heard of,
Firewall is a common term in internet terminology related to security.So
in this article lets see the inner things of Firewall and also
basically what a firewall is.
What is Firewall ?
Firewalls is like a
barrier between a computer and the Internet.A firewall is like a
security guard who stands at the entrance of your house and monitors or
filters the visitors coming to your door. The same thing a Firewall does
by filtering only known content and stops or filters unknown or
intruding content in your computer.
usually make decisions to allow or block network traffic(Internet)
between devices based on the rules that are set by the network Firewall
administrator. Usually most personal Firewalls such as Windows firewall
and other personal Firewalls work on the pre-configured rules that are
set.These Personal firewalls are easy to use and hence used by low
end-users & other basic users for low end processes. However, large
networks need customized firewalls that have plenty of options to
configure so as to meet their customized needs.
Firewalls use one or
more of the following methods to control the incoming and outgoing
traffic in a network,The below classification is more like the basic
types of Firewalls what they use to work.
Packet Filtering: In this type of method data or the little chunks of info are filtered based on a set of key filters.
These key filters usually have a set of pre configured rules on which
they abide to follow the process.Whenever a packet of data doesn't meet
the pre configured instructions the firewall doesn't allow and will terminate the information.This Packet Filtering technique is a older technique.
Stateful Inspection: This type is a latest method that doesn't work the way packet filtering does. It usually compares certain indifference's of
each packet to a database of trusted source.The incoming and out going
packets are compared to the one in data base if the comparison yields a
reasonable match, then the packets are allowed to travel further
your Firewall is the most important step of security and protection
.Configuring your Firewall needs your own specific used usually the
default Firewall settings are enough for a normal PC or home computer
but when the necessities increases the need for the customization of
Firewall is increased
Hardware and Software Firewall:
Usually Hard ware
firewalls provide more security than the software firewalls but since
Hardware Firewalls are more expensive than software Firewalls they are
less widely use.Hardware Firewalls are usually used in servers which use
good amount of security and these firewalls are usually hard built in
the server itself.These are in-built unit of a router and provide
maximum security as it filters each packet in the hardware level itself
even before it manages to enter your computer.
Do we really need Firewalls?
provide seamless security over many threats which try to enter our
networks and exploit us. Usually Firewalls evade the threats and doesn't
allow the foreign programs to enter our networks.But as we know every
thing has its own limitations some major
threats such as DOS and DDOS attacks manage to bypass the Firewalls and
threats your networks. Even though firewall is not a complete answer to
online threats, it can most effectively handle the attacks and provide
security to the computer up to the maximum possible extent.