Both IDS and IPS are designed to identify malicious activity in a network, but the key difference lies in what they do after detection.
IDS = DETECT & ALERT
IPS = DETECT & ACT
What is an IDS(Intrusion Detection System)?
Theoretical Understanding:
An IDS is a passive monitoring system that analyzes network traffic and system activities to identify suspicious behaviour.
It does NOT block traffic — it only:
- Monitors
- Detects
- Alerts
Types:
- Network-based IDS (NIDS) → monitor network traffic.
- Host-based IDS(HIDS) → monitors a specific system.
What is an IPS(Intrusion Prevention System)?
Theoretical Understanding:
An IPS is an active security control system placed inline within the network.
It not only detects threats but also:
- Blocks malicious traffic
- Drops packets
- Terminates connections
How it works:
- Sits between source and destination
- Inspects traffic in real-time
- Takes immediate action
Deeper Insight
- IDS is like a security camera → it watches and reports
- IPS is like a security guard → it stops intruders
🔎 Key Differences
ROLE
- IDS → Detection
- IPS → Prevention
Placement
- IDS → Out-of-band
- IPS → Inline
Action
- IDS → Alerts only
- IPS → Block threats
Risk
- IDS → No disruption
- IPS → May block legitimate traffic(false positives)