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'''DDoS''' is the acronym for '''Distributed Denial of Service.''' The [[SEI|Software Engineering Institute]]- [[CERT]] at [[Carnegie Mellon University]] explained that the telephone system, computer system and the Domain Name System ([[DNS]]) sometimes become unusable during peak hours because of supply and demand. However, when an intruder or hacker interrupts the system, takes control of the computer and prevents the legitimate user to use it and forces the computer to send large amount of email to someone else which can not be handled by the recipient's disk that saves e-mails, a '''Denial of Service (DoS) attack''' happens. If an intruder attacks a particular computer, takes control of it and sends extraordinary amount of data to a website and distribute it to numerous email addresses affecting the users computer network, the intrusion is called '''Distributed Denial Of Service attack'''.<ref>[http://www.cert.org/homeusers/ddos.html What is a Distributed Denial of Service (DDoS) Attack and What Can I Do About It?]</ref>]
'''DDoS''' is the acronym for '''Distributed Denial of Service.''' The [[SEI|Software Engineering Institute]]- [[CERT]] at [[Carnegie Mellon University]] explained that the telephone system, computer system and the Domain Name System ([[DNS]]) sometimes become unusable during peak hours because of supply and demand. However, when an intruder or hacker interrupts the system, takes control of the computer and prevents the legitimate user to use it and forces the computer to send large amount of email to someone else which can not be handled by the recipient's disk that saves e-mails, a '''Denial of Service (DoS) attack''' happens. If an intruder attacks a particular computer, takes control of it and sends extraordinary amount of data to a website and distribute it to numerous email addresses affecting the users computer network, the intrusion is called '''Distributed Denial of Service attack'''.<ref>[http://www.cert.org/homeusers/ddos.html What is a Distributed Denial of Service (DDoS) Attack and What Can I Do About It?]</ref>]
==Background==
The CERT/CC at Canegie Mellon University documented the first incident of Denial Of Service Attack in 1999 when the [[Trinoo]] and [[Tribe Flood Network]] (TFN) DDoS Network tools were widely distributed. The two DDoS used UDP Flood attack, TCP SYN flood, ICMP echo request flood, and ICMP directed broadcast denial of service attacks respectively.<ref>[http://www.cert.org/incident_notes/IN-99-07.html Cert Incident Notes IN-99-09 Distributed Denial of Service Tools]</ref> Trinoo attacked a single computer from Minnesota University, affected around 227 systems and became unusable for more than two days.<ref>
[http://www.garykessler.net/library/ddos.html Defenses Against Distributed Denial of Service Attacks]</ref>
On February 2000, a massive DDoS attack against high profile websites including [[Yahoo]]!, Buy.com, eBay, CNN, Amazon.com, ZDNet.com, E*Trade, and Excite were paralyzed and lost an estimated amount of $1.7 billion. A suspect in who is a juvenile Canada with an online alias "mafiaboy" was arrested on April of the same year. He plead guilty on January 18, 2001 on 56 charges of mischief and illegal use of computer services.<ref>[http://www.pbs.org/wgbh/pages/frontline/shows/hackers/whoare/notable.html E-Commerce Giants Crippled in DDoS Attacks]</ref>
Read more: http://www.pbs.org/wgbh/pages/frontline/shows/hackers/whoare/notable.html#ixzz1XyDYlZrq
==Frequent Targets of Intruder Attacks==
==Frequent Targets of Intruder Attacks==