Firewalls: Defense Against Malicious PC Attacks

Many companies use firewalls to protect their computer systems against viruses, worms, and other malicious software attacks.  A lot of networking systems incorporate both hardware and software firewalls for maximum protection.

What can a firewall do?  A firewall acts like an actual “wall”, “block” or “barricade” for your computer system.  All data transmitted to and from your computer will have to pass through the firewall.  All bits of data are therefore, sifted as it tries to pass through the firewall.  Suspicious data are instantly blocked by the firewall to safeguard the whole system against possible corruption or damage.


There are different types of firewall and each one is designed for specific purposes.  Some firewalls are designed to protect data encryption, others protect packet filters, and some are used to secure application gateways.

For a business, online computer system security is crucial.  Identity thieves often evade computer systems to steal information that they can use to commit fraud.  This is why business owners especially must be aware on protecting their system.

Malicious Attacks that Can Be Used Against You

Identity thieves or hackers use cunning tactics to steal information.  One way of hacking is called “IP spoofing”.  An untrusted network will try to evade a computer system by “disguising” or “spoofing” a trusted network.  This is made possible by using an IP address that “looks like” the IP address of a valid source.

Another way to steal or evade systems is by using Network Packet Sniffers.  Batches of data we send and receive over the internet are transmitted in “packets”.  Network Packet Sniffers pick out or in a sense, “sniff’ these packets as they are transmitted.  This method of hacking is most frequently used by hackers because it’s easier to do.  Also, this tactic is harder to recognize which is why a lot of hackers get away with their crimes.

Password stealing is another favorite tactic.  Hackers can “guess” passwords using tools that automatically enter all possible combinations at a high speed rate.  Some hackers may also use the Brute-Force Logon technique or the Password Cracking software and others may try to guess easy passwords manually.

Yes, installing a firewall in your network doesn’t mean you will be invincible against all sorts of malicious attacks.  However, having a firewall is certainly better than not using a firewall at all.  Even the simplest types of viruses can invade your system if you don’t have any line of defense against them.

About the Author

Maureen Stesson is a writer and a sharp internet marketer in her own right. For years, she has mastered the art of online marketing to snowball online success. She currently shares her knowledge in order for others to learn internet marketing.

Copyright 2009

2 thoughts on “Firewalls: Defense Against Malicious PC Attacks”

  1. This article reminds me of an acquaintance’s experience. She had her own computer at home. And she had lot of personal datas installed in it. Little did she know that the person she chatted for a month is a hacker. I don’t know exactly what kind of hacking techniques this guy used. She was sure that she didn’t post any of her personal datas in any sites she had used before. She just received an email telling her that these infos are on the net. She hadn’t use any firewall. This is just a personal computer I am talking about. What more if it is a business one? A more serious problem would probably have come her way.

    The writer of this blog is correct. It is not 100% guaranteed that firewall can prevent all sorts of malicious attacks. But at least, you have a defense. It is way better than having nothing at all.

  2. I agree! Although it’s not a guarantee that you won’t be evaded by scammers and viruses, still you have to use firewalls. Lots of viruses in the net.

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