DENIAL OF SERVICE

SEMINAR MATERIAL ON DENIAL OF SERVICE 

A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer 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 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 with regards to computer networks, but is not limited to this field, for example, it is also used in reference to CPU resource management.

There are two general forms of DoS  attacks: those that crash services and those that flood services.
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. In general terms, DoS attacks are
implemented by either forcing the targeted computer 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.

To order this seminar material (doc and ppt), click here