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When an attacker uses only one computer to perform consecutive HTTP requests to a server, saturating its services, that's called:
A DDoS attack
A SQL injection attack
A MITM attack
A DoS attack
It is a Denial of Service (DoS) attack. It only uses one machine for the attack. If the attacker uses bots or other compromised machines to perform the attack, then it will be a Distribute Denial of Service (DDoS) attack.
The other two answers are not relevant in this context.
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