Chen , 2004 . There are two categories of mechanisms of attack possible in DoS - 1 . Direct Attack . 2 . Indirect Attack . In case of Direct Attack the attacker attacks the victim directly without hiding his identity (Chen , 2004 . The various direct attacks are : Land Attack Tear Drop Attack Ping of Death Synchronization Flood The Indirect Attacks are those attacks in which the attacker is able to attack the victim hiding his own identity , either by using intermediary machines or by spoofing packets...











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