Denial of service is a condition during which a computer is not capable of providing its legitimate services.
Denial of service could be because of several reasons and it is sometimes a kind of attack, called denial of service attack when done intentionally to crash a computer system.
Common sources of denial of service:
- Defect software resulting in computer crash
- Limitations of the hardware of a computer system that limit its capabilities when providing necessary services
- Network-originated denial of service that is originated from excessive legitimate requests from other computers through a network or as an outcome of excessive service requests by sending random data by malicious parties to crash the related computer