Ahsun Taquveem Chohan

A- INTRODUCTION
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A-1. WHAT IS A DENIAL OF SERVICE ATTACK
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Denial of service is about without permission knocking off services, for example through crashing the whole system. This kind of attacks are easy to launch and it is hard to protect a system against them. The basic problem is that Unix assumes that users on the system or on other systems will be well behaved

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The openness of the Internet has dramatically transformed global communications, making it easy for people around the world to exchange information. But the very same openness also creates an enormous problem. Anyone can access the network, yet not everyone has good intentions.
Some engage in malicious mischief by unleashing destructive software programs, while others view hacking computer networks as sport. Then there are people with criminal goals in mind.
To avoid becoming a victim of misguided pranksters or cyber-crime, take the time to examine the security of your personal data. Here are our recommendations, along with links to more detailed information:
1. Use anti-virus software:
Viruses spread rapidly and can damage or destroy your computer. New ones appear almost daily. It’s critical that you install and update anti-virus software regularly. Use the program to scan all the files on your system once a week, deleting the infected ones. I use avg free edition, you can get it from http://free.avg.com
2. Beware of e-mail attachments:

A virus can hide in an attachment. Opening it will unleash the virus. Don’t open an attachment from anyone you don’t know. Even if you do know the sender, an infected attachment may have been surreptitiously sent from an infected machine. The safest thing to do is to scan the attachment with anti-virus software before you open it.
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