Module 10 - Denial-of-Service

Question 1

• An attack on a computer or network that reduces, restricts, or prevents accessibility of system resources to its legitimate users.
• Attackers flood the victim system with non-legitimate service requests or traffic to overload its resources.

Answer 1

Denial-of-Service (DoS) Attack

Question 2

• A coordinated attack which involves a multitude of compromised systems (Botnet) attacking a single target; thereby causing denail of service for users of the targeted system.
• 2 or more computers attacking a computer or network.

Answer 2

Distributed Denail-of-Service (DDoS) Attack

Question 3

large volumes of ICMP

DoS/DDoS Attack Techniques:

A type of attack in which attackers send large volumes of ICMP echo request packets to a victim system directly or through reflection networks.

a. Ping of Death Attack
b. SYN Flood Attack
c. UDP Flood Attack
d. ICMP Flood Attack

Answer 3

d. ICMP Flood Attack

Question 4

DoS/DDoS Attack Techniques:

The attacker send a large number of SYN request to target server (victim) with fake source IP address.

SYN–SYN/ACH, SYN–SYN/ACH, SYN–SYN/ACH, SYN–SYN/ACH, SYN–SYN/ACH, SYN–SYN/ACH

a. Ping of Death Attack
b. SYN Flood Attack
c. UDP Flood Attack
d. ICMP Flood Attack

Answer 4

b. SYN Flood Attack

Question 5

DoS/DDoS Attack Techniques:

An attacker tries to crash, destabilize, or freeze the targeted system or service by sending malformed or oversized packets using a simple ping command.

a. Ping of Death Attack
b. SYN Flood Attack
c. UDP Flood Attack
d. ICMP Flood Attack

Answer 5

a. Ping of Death Attack

Question 6

DoS/DDoS Attack Techniques:

• Permanent DoS, refers to attacks that cause irreversible damage to system hardware.
• This attack is carried out using a method know as “bricking a system”

Answer 6

Phlashing

Question 7

A ________ is a huge nework of compromised systems and can be used by an attacker to launch denial-of-service attacks.

Answer 7

Botnet

Question 8

_____ are software applications that run automated tasks over the internet and perform simple repetitive tasks, such as web spidering and search engine indexing.

Answer 8

Bots

Question 9

DoS/DDoS Attack Tools:

_____ makes a DDoS to attack any IP address with a user selected port and a user selected protocol.

a. High Orbit Ion Cannon (HOIC)
b. Low Orbit Ion Cannon (LOIC)

Answer 9

a. High Orbit Ion Cannon (HOIC)

Question 10

DoS/DDoS Attack Tools:

____ can be used on a target site to flood the server with TCP packets, UDP packets, or HTTP requests with the intention of disrupting the service of a particular host.

a. High Orbit Ion Cannon (HOIC)
b. Low Orbit Ion Cannon (LOIC)

Answer 10

b. Low Orbit Ion Cannon (LOIC)