DataStructures / Cyber Security Interview Questions
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.
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