Distributed Denial of Service (DDoS) is an attack to computer or server who doing by many other computers that are connected via the Internet.
Problems caused:
Because DDoS attacks carried out by many computers on a single target (computer / server) then the lightest possible problem is the difficulty of a computer or server that becomes the victim to be accessed.
Worst case in a DDoS attack is total paralysis of a machine due to hardware damage due to "bombarded" a very large data packets. Some systems are very attractive to attackers DDoS including: Web Server, FTP Server, Email Server, and so forth.
DDoS also often involve malware called botnets. It works like a Trojan horse that menembuh to a particular system and make the computer messengers (zombies). That's why computer users who are used to attack other computers sometimes do not realize it.
Prevention / neutralization:
Although there is no best way to avoid DDoS but identify where the weakest point in the network and use of firewall that is able to automatically eliminate the DDoS packets are 2 ways you can do to protect the system from this attack.
Use of the device ready to use kind of a Cisco Self Defending Network Appliance can also be used as another option to circumvent the DDoS attacks.
from : http://www.infokomputer.com
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