DoS Attacks

Question 1

What is the attackers goal when generating a DoS attack?

Answer 1

Take out a large network with little computing work

Question 2

How do attackers want to achieve taking out a large network with little computing work?

Answer 2

Amplify small number of packets to have big effect

Question 3

What are the two basic types of DoS amplification attacks?

Answer 3

DoS bug and DoS flood

Question 4

What is a DoS bug?

Answer 4

A design flaw that allows one machine to disrupt a service

Question 5

What is a DoS flood?

Answer 5

A command of bot-nets to generate a flood of requests

Question 6

What layers are DoS attacks applicable to?

Answer 6

Any layer

Question 7

What happens when an attacker sends a ping request to a broadcast address of a network? What is the countermeasure to this attack?

Answer 7

Every host on target network generates a ping reply to victim.
Countermeasure: reject external packets to broadcast address.