Denial of service attacks are designed to make a machine or network resource unavailable to its intended users. Attackers can deny service to individual victims, such as by deliberately entering a wrong password enough consecutive times to cause the victim account to be locked, or they may overload the capabilities of a machine or network and block all users at once. While a network attack from a single IP address can be blocked by adding a new firewall rule, many forms of Distributed denial of service (DDoS) attacks are possible, where the attack comes from a large number of points – and defending is much more difficult. Such attacks can originate from the zombie computers of a botnet, but a range of other techniques are possible including reflection and amplification attacks, where innocent systems are fooled into sending traffic to the victim. COUNT 5
QSN1 What are attacks designed to make a machine or network unavailable to its intended users? ANS1 Denial of service attacks QSN2 What does deliberately entering the wrong password enough consecutive times cause? ANS2 the victim account to be locked QSN3 What are attacks where innocent systems are fooled into sending traffic to the victom called? ANS3 reflection and amplification attacks QSN4 What does DDoS stand for? ANS4 Distributed denial of service QSN5 How can a network attack from a single IP address be blocked? ANS5 by adding a new firewall rule