DDOS Attack

Subject: DDOS Attack Mon Aug 13, 2012 1:43 pm

DDOS Attack:

A denial-of-service attack (DoS attack) or distributed
denial-of-service attack (DDoS attack) is an attempt to make a computer
or network resource unavailable to its intended users. Although the
means to carry out, motives for, and targets of a DoS attack may vary,
it generally consists of the concerted efforts of a person, or multiple
people to prevent an Internet site or service from functioning
efficiently or at all, temporarily or indefinitely.

Perpetrators of DoS attacks typically target sites or services hosted on
high-profile web servers such as banks, credit card payment gateways,
and even root nameservers. The term is generally used relating to
computer networks, but is not limited to this field; for example, it is
also used in reference to CPU resource management.[1]

One common method of attack involves saturating the target machine with
external communications requests, such that it cannot respond to
legitimate traffic, or responds so slowly as to be rendered effectively
unavailable. Such attacks usually lead to a server overload. In general
terms, DoS attacks are implemented by either forcing the targeted
computer(s) to reset, or consuming its resources so that it can no
longer provide its intended service or obstructing the communication
media between the intended users and the victim so that they can no
longer communicate adequately.

Denial-of-service attacks are
considered violations of the IAB's Internet proper use policy, and also
violate the acceptable use policies of virtually all Internet service
providers. They also commonly constitute violations of the laws of
individual nations.

When the DoS Attacker sends many packets of
information and requests to a single network adapter, each computer in
the network would experience effects from the DoS attack.

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