denial-of-service attack

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Related to denial-of-service attack: Distributed Denial of Service Attack

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, and other websites. (Article headline courtesy of the Philadelphia Inquirer.)
References in periodicals archive ?
OTCQB:VLDI), Ottawa,a developer of world class software based solutions for the management and protection of digital information, data and assets, is issuing the third of three news releases explaining how Validian could prevent, not just detect, the recent onslaught of well publicized Cyber Attacks, including theft of stored digital keys, hacking and denial-of-service attacks.
Sophos virus researchers are warning of a new strain of the Netsky worm, Netsky-R (W32/Netsky-R), which launches denial-of-service attacks on peer-to-peer file sharing sites, including Kazaa, as well as various sites offering software security cracks.
We do have experience on our side, but unfortunately if a denial-of-service attack is taking place there's not a great deal you can do to prevent it from happening.
A distributed denial-of-service attack on Monday (21 October) temporarily disabled seven of the 13 root servers that manage global Internet traffic.
From denial-of-service attacks to telecommunications fraud, the Secret Services' Electronic Crimes Task Force (ECTF) often nabs the savviest cyber criminals within days of an attack.
This attack is the latest in a series of distributed denial-of-service attacks targeting DNS servers that began late last year.
An attack on a VoIP network might begin as a malicious denial-of-service attack on a SIP server, or when a worm infected subscriber unknowingly begins to flood the network with traffic.
With CloudShield as a valued partner, we are providing attack mitigation services in the network and hosting centers that operate so that the next time a customer is targeted by a denial-of-service attack, it will have zero impact on their day-to-day operations -- and their bottom line.
In a survey of over 100 top enterprise IT and email administrators in the US, over 50% of organizations recognized that they had been hit by an email denial-of-service attack, over 40% recognized that they had been the victim of a directory harvest attack, and a significant percentage had email intercepted or their email servers hacked in the preceding 12 months.
The threat made by Anonymous, which has carried out denial-of-service attacks on multinational corporations such as PayPal, MasterCard, Visa, and Sony in the past, states that they are planning to attack petrochemical companies in protest at the US dollar being used as the currency to buy and sell oil.