Is one in which a malicious hacker takes over computers via the Internet and causes them to flood a target site?

Answer:

DDOS which basically stands for Distributed Denial of Service.

Explanation:

DDoS meaning: What is DDoS?

Distributed denial of service (DDoS) attacks are a subclass of denial of service (DoS) attacks. A DDoS attack involves multiple connected online devices, collectively known as a botnet, which are used to overwhelm a target website with fake traffic.

Difference of DDos in other cyberattacks.

Unlike other kinds of cyberattacks, DDoS assaults don’t attempt to breach your security perimeter. Rather, a DDoS attack aims to make your website and servers unavailable to legitimate users. DDoS can also be used as a smokescreen for other malicious activities and to take down security appliances, breaching the target’s security perimeter.

A successful distributed denial of service attack is a highly noticeable event impacting an entire online user base. This makes it a popular weapon of choice for hacktivists, cyber vandals, extortionists and anyone else looking to make a point or champion a cause.

DDoS attacks can come in short bursts or repeat assaults, but either way the impact on a website or business can last for days, weeks and even months, as the organization tries to recover. This can make DDoS extremely destructive to any online organization. Amongst other things, DDoS attacks can lead to loss of revenues, erode consumer trust, force businesses to spend fortunes in compensations and cause long-term reputation damage.

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A distributed denial-of-service attack does not involve infiltration ofthe targeted system. Instead, it keeps the target so busy responding to a stream of automat-ed requests that legitimate users cannot get in—the Internet equivalent of dialing atelephone number repeatedly so that all other callers hear a busy signal. The targetedmachine “holds the line open” while waiting for a reply that never comes, and eventuallythe requests exhaust all resources of the target.

The software to initiate a denial-of-service attack is simple to use and readily availableat hacker sites. A tiny program is downloaded surreptitiously from the attacker’s computerto dozens, hundreds, or even thousands of computers all over the world. Based on a com-mand by the attacker or at a preset time, these computers (called zombies) go into action,each sending a simple request for access to the target site again and again—dozens of timesper second. The zombies involved in a denial-of-service attack are often seriously compromised andare left with more enduring problems than their target. As a result, zombie machines needto be inspected to ensure that the attacker software is completely removed from the system.In addition, system software must often be reinstalled from a reliable backup to reestablishthe system’s integrity, and an upgrade or patch must be implemented to eliminate the vul-nerability that allowed the attacker to enter the system.