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What is a denial of service(DOS) attack?

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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