What is Denial-of-service attack?
In short
A denial-of-service attack floods a system or network with traffic or requests so legitimate users can't reach it. A distributed denial-of-service (DDoS) attack uses many compromised devices at once.
Key takeaways
- It targets availability, one of the three security objectives alongside confidentiality and integrity.
- Defenses include traffic filtering, rate limiting, scrubbing services and spare capacity.
- The devices used are often part of a botnet controlled by the attacker.
Where it's tested
ISC: Information Security Fundamentals — study notes, a five-minute revision sheet and practice questions.
Practise: 3 questions
Question 1 of 3 · 0 answered
To send a confidential message that only the intended recipient can read, which key should the sender use to encrypt it?