1. DoS/DDoS Attack Forbes Henderson

2. What is a DoS Attack  DoS Attack (Denial of Service Attack)  A Denial of Service Attack is Often used by hackers to slow a computer system or stop a server from serving its users by crashing it.

3. How is it Done?  A Denial of Service Attack is done by a computer system by constantly sending packets of data to the server in order to slow the service to other users. A DDoS (Distributed Denial of Service Attack) is when multiple computer systems DoS together which is much more effective in slowing or Crashing a server.

4. Why is it Done?  A DoS/DDoS Attacks can be done to slow or crash a server. Often DoS/DDoS Attacks are used along side a form of virus to gain access to restricted parts of the server e.g. so that the “hacker” can gain access to restricted files or to gain access to a users account

5. How to Prevent One  Rate limit your router to prevent your Web server being overwhelmed.  Add filters to tell your router to drop packets from obvious sources of attack.  Timeout half-open connections more aggressively.  Drop spoofed or malformed packages  Set lower SYN, ICMP, and UDP flood drop thresholds.

6. Source  http://en.wikipedia.org/wiki/Denial-of- service_attack http://en.wikipedia.org/wiki/Denial-of- service_attack  http://www.esecurityplanet.com/network -security/5-tips-for-fighting-ddos- attacks.html http://www.esecurityplanet.com/network -security/5-tips-for-fighting-ddos- attacks.html