DoS and DDoS attacks in Computer Networks - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does DoS stand for in cybersecurity?

DoS stands for Denial of Service. It is an attack that aims to make a computer or network resource unavailable to its intended users by overwhelming it with excessive requests.

beginner

How does a DDoS attack differ from a DoS attack?

A DDoS (Distributed Denial of Service) attack uses multiple computers or devices to flood a target with traffic, making it harder to stop compared to a DoS attack, which usually comes from a single source.

beginner

What is the main goal of DoS and DDoS attacks?

The main goal is to disrupt normal service by overwhelming the target system, causing it to slow down or crash, so legitimate users cannot access it.

intermediate

Name one common method attackers use in DDoS attacks.

One common method is the use of botnets, which are networks of infected computers controlled remotely to send massive traffic to the target.

intermediate

Why is it harder to defend against DDoS attacks compared to DoS attacks?

Because DDoS attacks come from many different sources, it is difficult to block all malicious traffic without affecting legitimate users.

What does a DoS attack aim to do?

A Install malware on a computer

B Steal sensitive data from a server

C Make a service unavailable by overwhelming it

D Encrypt files for ransom

A DoS attack floods a service with traffic to make it unavailable to users.

What is a key feature of a DDoS attack?

A It targets only one user

B It only affects offline systems

C It is always harmless

D It uses multiple devices to attack

DDoS attacks use many devices to send traffic, making them more powerful.

Which of these is commonly used to launch DDoS attacks?

A Botnets

B Firewalls

C Antivirus software

D Encryption keys

Botnets are networks of infected devices used to send large amounts of traffic in DDoS attacks.

Why is blocking DDoS traffic challenging?

A Because it uses only one IP address

B Because it comes from many sources

C Because it is legal traffic

D Because it only targets hardware

DDoS attacks come from many different devices, making it hard to block without affecting real users.

What is the main effect of a successful DoS or DDoS attack?

A Service becomes slow or unavailable

B Data is permanently deleted

C User passwords are changed

D Software updates automatically

The attack causes the service to slow down or stop working, denying access to users.

Explain in your own words what a DoS attack is and how it affects a website or service.

Think about what happens when too many people try to enter a small shop at once.

Describe the difference between DoS and DDoS attacks and why DDoS attacks are more difficult to stop.

Imagine one person shouting versus a crowd shouting at the same time.