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Define Denial-of-Service (DoS) Attack?

A Denial-of-Service attack overwhelms a target system, service, or network with traffic or requests until it can no longer respond to legitimate users.

Attackers typically flood a server with more connection requests or data than it can process, exhausting its CPU, memory, or bandwidth.

  • SYN flood attacks exhaust connection tables with half-open TCP handshakes
  • Application-layer floods overload a specific service, like a login page
  • Volumetric floods saturate available network bandwidth

A basic DoS attack originates from a single source, which makes it comparatively easy to block by filtering that source's IP address.

What is the main goal of a DoS attack?
How many sources does a basic DoS attack originate from?

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