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Distributed Denial of Service : ウィキペディア英語版
Denial-of-service attack

In computing, a denial-of-service (DoS) attack is an attempt to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet. A distributed denial-of-service (DDoS) is where the attack source is more than one–and often thousands of-unique IP addresses.
Criminal perpetrators of DoS attacks often target sites or services hosted on high-profile web servers such as banks, credit card payment gateways; but motives of revenge, blackmail or activism can be behind other attacks.
==Symptoms==
The United States Computer Emergency Readiness Team (US-CERT) defines symptoms of denial-of-service attacks to include:
* Unusually slow network performance (opening files or accessing web sites)
* Unavailability of a particular web site
* Inability to access any web site
* Dramatic increase in the number of spam emails received—(this type of DoS attack is considered an e-mail bomb)
* Disconnection of a wireless or wired internet connection
* Long term denial of access to the web or any internet services
Denial-of-service attacks can also lead to problems in the network 'branches' around the actual computer being attacked. For example, the bandwidth of a router between the Internet and a LAN may be consumed by an attack, compromising not only the intended computer, but also the entire network or other computers on the LAN.〔
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If the attack is conducted on a sufficiently large scale, entire geographical regions of Internet connectivity can be compromised without the attacker's knowledge or intent by incorrectly configured or flimsy network infrastructure equipment.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Denial-of-service attack」の詳細全文を読む



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