What is Denial of Service 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. The primary goal of the attack is to deny the victim(s) access to a particular resource. Included is information that may help a respond to such attack.

A “denial-of-service” attack is characterized by an explicit attempt by attackers to prevent legitimate users of a service from using that service. Examples include

  •      Ø Attempts to “flood” a network, thereby preventing legitimate network traffic.

  •      Ø Attempts to disrupt connections between two machines, thereby preventing access to a service.

  •      Ø Attempts to prevent a particular individual from accessing a service.

  •      Ø Attempts to disrupt service to a specific system or person.

Reasons behind Denial of service

  •     Ø Blackmailing – Ransom money will be demanded by hackers or either a particular website will be intruded by them and personal data will be leaked.

  •     Ø Ideological conflicts – Hackers desire to silent a website since their values are different. For example an individual owning some porn site  and some web-vigilante maybe a rival religious floods a particular site.

  •    Ø Competitive advantage

  •    Ø Political Hactivis.

  •    Ø Fun.

  •    Ø Experiment – Some script kiddies have recently learnt the tricks of the trade and they do this for sheer personal pleasure.

  •    Ø Self Inflicted DDOS – A software bug is causing too many request to a particular site’s server.

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