Which type of attack originates from a single computer?

The type of attack that originates from a single computer is the Denial of Service (DoS) attack. In a DoS attack, the attacker aims to make a service unavailable to its intended users by overwhelming it with a flood of illegitimate requests from one source. This single point of attack can consume the target's resources, disrupt its normal functioning, and potentially cause service outages.

This differs from other types of attacks like Distributed Denial of Service (DDoS), which involves multiple systems collaborating to overwhelm a target, or specific techniques such as SYN Flood or Smurf attacks, which have characteristics that may involve multiple systems or unique methods of traffic manipulation. Understanding this distinction is crucial for recognizing different attack vectors and their implications for system security.