Distributed Denial Of Service Attack (Dos)
In real world scenario, a Denial-of-Service attack DoS attack) or Distributed Denial-of-Service attack (DDoS attack) is an effort to make a machine or network resource unavailable to its genuine users. Although the means to carry out, motives for, and objective of a DoS attack may vary, it generally consists of efforts to temporarily or indefinitely interrupt or eliminate services of a host connected to the internet. One common method of attack involves saturating the target machine with outside communications requests, so much so that it cannot respond to legitimate traffic or responds so lowly as to be rendered essentially unavailable. Such attacks usually lead to a server overload. In general terms, DoS attacks are carried out by either