denial of service attack

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denial of service attack

An assault on a network that floods it with so many requests that regular traffic is either slowed or completely interrupted. Unlike a virus or worm, which can cause severe damage to databases, a denial of service attack interrupts network service for some period.

Distributed Attack
A distributed denial of service (DDOS) attack can employ hundreds or even thousands of computers that have been previously infected. The computers act as a network of "zombies" working together to send out bogus messages, thereby creating huge volumes of phony traffic.

In 2016, the Dyn DNS system was hammered by a DDOS attack that caused sporadic slowdowns of major sites such as Twitter, Netflix and The New York Times. The zombie traffic reached more than 100 gigabytes per second of bogus messages. See botnet, smurf attack, SYN flood attack, land attack, teardrop attack and Ping of Death.


It's Not a New Phenomenon
In February 2000, computers were activated that had been previously hacked and planted with illicit programs. The unending number of requests caused a denial of service at Yahoo, eBay, Amazon.com and other websites. (Article headline courtesy of the Philadelphia Inquirer.)
References in periodicals archive ?
Prolexic Technologies recently announced it successfully mitigated another major DDoS attack of unprecedented size in terms of packet-per-second volume.
Google's Blogger blog publishing service has also been subject to the DDOS attacks.
All businesses with an online arm should implement the necessary preventative measures to mitigate the threat of a DDoS attack.
Spirent's DDoS Attack module helps proactively validate security features by simulating large-scale attacks, allowing users to easily modify the types of attacks and test in various scales.
Corero Network Security (CNS:LN), the leading provider of Distributed Denial of Service (DDoS) Defense and Next Generation IPS (NGIPS) solutions, today announced that Internet service provider (ISP) Fastmetrics has deployed its DDoS Defense technology to detect and block network- and application-layer DDoS attacks and all forms of malware-based attacks.
This, plus the overall growth in criminal sophistication, has led to a far greater danger of enterprises suffering a DDoS attack.
Businesses in the DACH region are the most conservative as only 82 percent are confident in their DDoS mitigation, though the majority (57 percent) have suffered a successful DDoS attack in the last 12 months.
com, claimed that if the site didn't remove a document involving one of Jahanrakhshan's cases then the site would be targeted by a DDoS attack that would result in visitors being unable to access the site.
What is the most damaging consequence of DDoS attacks to businesses?
Specifically, in 24% of all cases a DDoS attack caused services to
The survey found that 27% claimed that recovery from a DDoS attack took a whole day, 46% said it took a few days, 13% a week, 9% a few weeks and 4% a month.
Attackers either show off their skills by conducting a 'sample' DDoS attack on an organisation, which lasts for a short period of time and is followed by a threat of further attacks if ransom isn't paid, or simply skip the display of power and proceed straight to the ransom request.