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Firewall
To realize how Firewalls are important to every user in the Internet consider that usually unprotected PC arrears under attack within 20 minutes from the moment it has been connected to the internet. The user most likely is going to be attacked by the malicious software even while downloading all the necessary Windows patches needed to make his presence secure.
It can be clear from the name that Firewall is to protect your PC from possible unwanted interventions. Firewalls also hide your Internet-connected PC from view.
Firewalls are necessary not only to big companies to protect their PC from different kinds of threats such as worms, hijacks, viruses and aggressive spywear and others.
The better your Internet connection the more danger there is for you as hackers usually target such connections for its high bandwidth.
Firewalls types
There are two kinds of Firewalls, which are software applications and hardware devices. The software applications are run in the background and are less expensive than hardware devises that are to be plugged in between your modem and one or more PCs. Also hardware firewalls are easier to use than software as they don’t have any impact on the users’ computers.
You shouldn’t consider your security problem totally solved with purchasing a Firewall. As it can be great at decreasing a possibility of unwanted intrusions but it often can’t detect virus-laden e-mails or stop intrusive adware and spyware. So you will need some extra antivirus and spyware checkers.
Firewalls Methods
There are several methods of traffic control flowing in and out of the network. Firewall might use one or more of them. Those methods are following:
The newest one, the Stateful Inspection, implies comparing certain key features of the packet to a database of worth trust information. If the ingoing or outgoing information fails the comparison it’s discarded.
Packet Filtering small parts of data are analyzed by certain set of filters.
Proxy Service is provided by means of retrieving the information from the Internet and then is sent to the requesting system. Same goes for the data that is being transferred to the Internet.
So What Do Firewalls Do?
Firewalls are meant to protect your network or computer from different kinds of unauthorized access, the most widespread are:
- Remote login means that some third party is able to connect and control your computer.
- E-mail bombs are usually personally directed as in this case you are being sent same e-mail thousands of times till your computer is unable to accept any more messages.
- Viruses are small program that is self-copied to other computers. They vary from harmless messages to the ones that erase all of your data.
- Spam is like junk mail, which is harmless but always annoying. Though you should be very careful with such messages as clicking one of them you might accept a cookie that could provide a backdoor to your computer.
- There are lots of other kinds of threats you face, such as SMTP session hijacking, OS bugs, Source routing and others that Firewall is called to protect you from.
Firewall is totally configurable and customizable software, which means you can add or remove filters, such as IP address, Protocols, Domain Names, Ports and others.