← VCE Cyber Security

Intrusion prevention systems (IPS)

A system that sits inline in the traffic path, detects threats, and automatically blocks them before they reach the network.

Part of: VCE Applied Computing - U2O2 - Cyber Security — Module 13, VCE Data Analytics - U4O2 - Cyber Security: Data Security — Module 130, ACARA Digital Technologies Years 9–10 — Networked Systems and Access Control — Module 133, WA Computer Science ATAR Year 11 — Network Communications — Module 120, WA Computer Science ATAR Year 11 — Cyber Security — Module 125

Understanding Intrusion prevention systems (IPS) in VCE Cyber Security

What it does: This describes exactly what an IPS does when it detects a threat. This describes the inline placement that makes IPS blocking possible. An IPS takes direct action to stop threats, not just alert about them. Being inline lets an IPS inspect and act on traffic directly. An IPS blocks traffic; an IDS only detects and alerts. An IPS responds automatically and immediately to detected threats. Because it sits inline, an IPS can block traffic as it happens. An IPS actively blocks traffic, unlike a passive monitoring tool.

Common mistakes: An IPS does block traffic automatically, unlike an IDS which only alerts. An IPS actively blocks threats - it doesn't just watch like an IDS.

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Free printable worksheet with full answer key — or add this module to a class and your students practise it interactively.

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This module's key terms are also in a printable crossword (Modules 11–20) and word search (Modules 1–20).

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Learning
Duo
Does an IPS automatically block detected threats?
YesNo
Matches
An IPS only alerts like an IDS
↓
Wrong - an IPS blocks traffic, it doesn't just alert
Applying
Meanings
Term
Intrusion prevention system (IPS)
Meaning
A system that sits inline in the traffic path, detects threats, and automatically blocks them before they reach the network.
Practice
An IPS sits inline in the traffic path.
Testing
Gaps
An IPS malicious traffic
Check Answer
Spots
1IPS never blocks traffic
2IPS sits inline in traffic

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Quick Questions

1. Does an IPS automatically block detected threats?
A. Yes ✓
B. No
An IPS takes direct action to stop threats, not just alert about them.
2. Does an IPS sit inline in the traffic path?
A. Yes ✓
B. No
Being inline lets an IPS inspect and act on traffic directly.
3. Is an IPS the same as an IDS, which only alerts?
A. No ✓
B. Yes
An IPS blocks traffic; an IDS only detects and alerts.
4. Does an IPS act without needing a person to approve each block?
A. No
B. Yes ✓
An IPS responds automatically and immediately to detected threats.
5. Can an IPS stop an attack in real time?
A. No
B. Yes ✓
Because it sits inline, an IPS can block traffic as it happens.

Match the Pairs

IPS → Monitors traffic and blocks threats automatically
Inline placement → Sitting directly in the traffic path so traffic passes through it
Taking automatic action to stop a detected threat → IPS blocking
Sitting in the traffic path rather than only observing → Inline deployment
An IPS only alerts like an IDS → Wrong - an IPS blocks traffic, it doesn't just alert
An IPS sits outside the traffic path, watching a copy → Wrong - an IPS sits inline directly in the traffic path

Key Term

Intrusion prevention system (IPS)
A system that sits inline in the traffic path, detects threats, and automatically blocks them before they reach the network.

Fill in the Blanks

1. An IPS blocks malicious traffic
Hint: Type the word for stopping traffic from getting through.
2. An IPS sits inline in the traffic path
Hint: Type the word for being placed directly in the traffic's path.
3. An IPS acts automatically to stop threats
Hint: Type the word for acting without needing a person to approve it.
4. IDS alerts, but an IPS can also block traffic
Hint: Type the word for stopping the traffic outright.
5. An IPS is placed inline in the network path
Hint: Type the word for sitting directly within the traffic path.

Spot the Error

Question 1
A IPS never blocks traffic
B IPS sits inline in traffic
C It can stop threats live
Line A — An IPS does block traffic automatically, unlike an IDS which only alerts.
Question 2
A IPS sits inline in the path
B IPS only watches, never acts
C It blocks threats live
Line B — An IPS actively blocks threats - it doesn't just watch like an IDS.
Question 3
A IPS blocks malicious traffic
B It acts automatically
C It never sits inline
Line C — An IPS sits inline in the traffic path so it can act directly.
Question 4
A IPS is placed inline
B It blocks threats live
C It acts without delay
D It only alerts, never blocks
Line D — Unlike an IDS, an IPS blocks threats rather than only alerting.
Question 5
A IPS sits in the traffic path
B It can stop an attack
C It acts automatically
D It never affects traffic
E It works passively only
Line E — An IPS works actively, taking direct action on traffic, not passively.

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