GCIH Question #142: Real Exam Question with Answer & Explanation

A Denial-of-Service (DoS) attack is mounted with the objective of causing a negative impact on the performance of a computer or network. It is also known as network saturation attack or bandwidth consumption attack. Attackers perform DoS attacks by sending a large number of protocol packets to a network. The problems caused by a DoS attack are as follows: l Saturation of network resources l Disruption of connections between two computers, thereby preventing communications between services l Disruption of services to a specific computer l Failure to access a Web site l Increase in the amount of spam Which of the following can be used as countermeasures against DoS attacks? Each correct answer represents a complete solution. Choose all that apply.