Do u know about DDoS? Bitcoin exchange company has become the major victim of it..

Hii Steemiters,
In recent weeks, i heard a lot of news about DDoS Attack in two big bitcoin exchange company named Bitfinex and BTC-E.So what exactly is DDoS?how does it works? i wanted to share some of my views so i posted here..

DDoS is short for Distributed Denial of Service. DDoS is a type of DOS attack where multiple compromised systems, which are often infected with a Trojan, are used to target a single system causing a Denial of Service (DoS) attack. Victims of a DDoS attack consist of both the end targeted system and all systems maliciously used and controlled by the hacker in the distributed attack.

In a typical DDoS attack, the assailant begins by exploiting a vulnerability in one computer system and making it the DDoS master. The attack master system identifies other vulnerable systems over the network and gains control over them by either infecting the systems with malware or through bypassing the authentication controls i.e., guessing the default password on a widely used system. the incoming traffic flooding the victim originates from many different sources potentially hundreds of thousands or more. This effectively makes it impossible to stop the attack simply by blocking a single IP address plus, it is very difficult to distinguish legitimate user traffic from attack traffic when spread across so many points of origin.
Types of DDoS attacks
There are three types of DDoS attacks.they are
Traffic attacks: Traffic flooding attacks send a huge volume of TCP, UDP and ICPM packets to the target. Legitimate requests get lost and these attacks may be accompanied by malware exploitation.
Bandwidth attacks: This DDos attack overloads the target with massive amounts of junk data. This results in a loss of network bandwidth and equipment resources and can lead to a complete denial of service.
Application attacks: Application-layer data messages can deplete resources in the application layer, leaving the target's system services unavailable.

DDoS attacks can create significant business risks with lasting effects. Therefore, it is important for IT and security administrators and managers, as well as their business executives, to understand the threats, vulnerabilities and risks associated with DDoS attacks.

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