What is the difference between IDS and IPS?

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IDS (Intrusion Detection System) and IPS (Intrusion Prevention System) are cybersecurity tools used to detect and respond to malicious activity on a network, but they differ in functionality and response.

🔍 IDS – Intrusion Detection System:

• Purpose: Monitors network or system activity to detect suspicious behavior or policy violations.

• Function:

  • Acts as a passive system.

  • Alerts security personnel when a potential threat is detected.

• Action: Does not block or stop the traffic; only logs and sends alerts.

• Placement: Typically placed out-of-band (a copy of traffic is sent to it).

Example: An IDS detects a port scan and sends an alert to the administrator but allows the traffic to continue.

🔐 IPS – Intrusion Prevention System:

• Purpose: Actively monitors and blocks malicious traffic in real time.

• Function:

  • Acts as an active system.

  • Can drop packets, reset connections, or quarantine traffic.

• Action: Prevents attacks automatically without waiting for human intervention.

• Placement: Positioned inline with the network traffic.

Example: An IPS detects a SQL injection attack and blocks the malicious request instantly.

Both IDS and IPS are critical in layered security, with IPS offering real-time protection and IDS providing detailed threat visibility.

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