What Is an IPS?
An Intrusion Prevention System (IPS) actively blocks malicious traffic in real time.
An IPS:
- Detects attacks
- Automatically blocks threats
- Sits inline with network traffic
- Prevents malicious connections
Example:
If malware traffic is detected, the IPS can immediately block the connection before damage occurs.
Key Difference Between IDS and IPS
| Feature | IDS | IPS |
|---|---|---|
| Detection | Yes | Yes |
| Prevention | No | Yes |
| Traffic Blocking | No | Yes |
| Placement | Passive | Inline |
| Main Purpose | Alerting | Blocking |
Advantages of IDS
- Lower risk of blocking legitimate traffic
- Good for visibility and monitoring
- Easier to deploy
- Useful for forensic investigations
Advantages of IPS
- Stops attacks automatically
- Provides real-time protection
- Reduces incident response time
- Improves network security posture
Common Types of IDS and IPS
Network-Based IDS/IPS (NIDS/NIPS)
Monitors network traffic.
Host-Based IDS/IPS (HIDS/HIPS)
Installed directly on endpoints or servers.
IDS vs IPS in Modern Security
Modern organisations often combine:
- IDS
- IPS
- SIEM
- EDR
- Firewall technologies
for layered security.
This supports the Defense in Depth principle.
Conclusion
Both IDS and IPS are important cybersecurity controls.
- IDS focuses on detection and visibility.
- IPS focuses on prevention and automated blocking.
Understanding the difference is essential for cybersecurity professionals and certification exams.