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DataStructures / Cyber Security Interview Questions

What is the difference between IDS and IPS?
IDSIPS
Monitors traffic and generates alertsMonitors traffic and actively blocks malicious activity
Passive, sits out-of-line via a mirrored portInline, sits directly in the traffic path
No impact on traffic flow if it failsCan become a bottleneck or single point of failure if it fails
Best for visibility and forensic analysisBest for real-time prevention

Many organizations deploy both together: the IDS gives full visibility for investigation, while the IPS blocks known-bad traffic automatically, cutting down the response window compared to relying on IDS alerts alone.

Which system sits inline and can actively block traffic?
What is a downside of deploying an IPS inline?

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