Which of the following attacks saturates network resources and disrupts services to a specific computer?
A.
Replay attack
B.
Polymorphic shell code attack
C.
Teardrop attack
D.
Denial-of-Service (DoS) attack
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 a network saturation attack or bandwidth consumption attack. Attackers perform DoS attacks by sending a large number of protocol packets to the network. The effects of a DoS attack are as follows. Saturates network resources Disrupts connections between two computers, thereby preventing communications between services Disrupts services to a specific computer Causes failure to access a Web site Results in an increase in the amount of spam A Denial-of-Service attack is very common on the Internet because it is much easier to accomplish. Most of the DoS attacks rely on the weaknesses in the TCP/IP protocol.Answer A is incorrect. A replay attack is a type of attack in which attackers capture packets containing passwords or digital signatures whenever packets pass between two hosts on a network. In an attempt to obtain an authenticated connection, the attackers then resend the captured packet to the system. In this type of attack, the attacker does not know the actual password, but can simply replay the captured packet.
Answer C is incorrect. In a teardrop attack, a series of data packets are sent to the target computer with overlapping offset field values. As a result, the target computer is unable to reassemble these packets and is forced to crash, hang, or reboot.
Answer B is incorrect. In a polymorphic shell code attack, the attacker sends malicious data which continuously changes its signature. The signature is changed by the attacking payload sent by the attacker. Since the new signature of the data does not match the old signature entered into the IDS signature database, IDS becomes unable to point out the malicious datA.Such data can harm the network as well as the IDS.
Reference. "http.//en.wikipediA.org/wiki/Denial-of-service_attack"