The answer is that the intrusion detection system is set to alert-only, so it cannot block attacks. This is the most significant security gap because while the firewall rule allowing direct database access from web servers on port 3306 without authentication or encryption is a serious design flaw, an IDS in alert-only mode provides no active defense—it merely logs critical and high-severity signatures without stopping malicious traffic. On the CISM exam, this scenario tests your ability to prioritize operational gaps over architectural weaknesses; a common trap is focusing on missing encryption or a CIS Level 1 baseline, but the core principle is that detection without prevention leaves the database exposed to real-time exploitation. Remember: if the IDS cannot block, it is only a witness, not a guard.
CISM Information Security Program Practice Question
This CISM practice question tests your understanding of information security program. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
Exhibit:
```
{
"securityControls": {
"firewall": {
"state": "active",
"rules": [
{"action": "allow", "src": "any", "dst": "web-servers", "port": 443},
{"action": "allow", "src": "web-servers", "dst": "db-servers", "port": 3306},
{"action": "deny", "src": "any", "dst": "any", "port": "any"}
]
},
"intrusionDetection": {
"state": "active",
"signatures": ["critical", "high"],
"action": "alert"
},
"vendorBaseline": "CIS Level 1"
}
}
```
This JSON policy is for a web application environment. The db-servers network is considered internal.
Based on the exhibit, what is the most significant security gap in this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The intrusion detection system is set to alert-only, so it cannot block attacks.
The firewall allows traffic from web to db on port 3306 (MySQL) but there is no authentication or encryption specified; also, the IDS only alerts on critical and high signatures but does not block. However, a more fundamental gap is that the baseline is CIS Level 1, which may not be sufficient for a database server. But the question asks for the most significant gap: the firewall rule allows direct database access from web servers without any restriction or monitoring of that traffic, and the IDS is in alert-only mode, meaning malicious traffic to database will not be blocked. Combined, the gap is that database traffic is allowed but not inspected for anomalies beyond basic signatures. But among options, the one that stands out is that database access is not protected by an application-layer firewall or WAF. However, we need to craft plausible options. Let's think: The exhibit shows a JSON policy. Common gaps: no encryption, no authentication, IDS not inline, etc. The most significant is likely that the IDS is not set to block or prevent attacks. But also, the firewall allows direct database access from web, which is a design issue. Let's design options accordingly.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The intrusion detection system is set to alert-only, so it cannot block attacks.
Why this is correct
Without prevention, attacks may succeed before manual response.
Related concept
Static NAT maps one inside address to one outside address.
✗
The vendor baseline is CIS Level 1, which may be too permissive.
Why it's wrong here
Level 1 is a reasonable starting point; not the most significant gap compared to IDS action.
✗
The firewall allows inbound HTTPS from any source to web servers.
Why it's wrong here
This is necessary for public web access; not a gap.
✗
The database port 3306 is exposed to web servers without encryption.
Why it's wrong here
While encryption is not specified, the primary gap is the IDS not blocking; also, internal traffic encryption may be less critical.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISM NAT questions on configuration and troubleshooting.
Information Security Program — This question tests Information Security Program — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The intrusion detection system is set to alert-only, so it cannot block attacks. — The firewall allows traffic from web to db on port 3306 (MySQL) but there is no authentication or encryption specified; also, the IDS only alerts on critical and high signatures but does not block. However, a more fundamental gap is that the baseline is CIS Level 1, which may not be sufficient for a database server. But the question asks for the most significant gap: the firewall rule allows direct database access from web servers without any restriction or monitoring of that traffic, and the IDS is in alert-only mode, meaning malicious traffic to database will not be blocked. Combined, the gap is that database traffic is allowed but not inspected for anomalies beyond basic signatures. But among options, the one that stands out is that database access is not protected by an application-layer firewall or WAF. However, we need to craft plausible options. Let's think: The exhibit shows a JSON policy. Common gaps: no encryption, no authentication, IDS not inline, etc. The most significant is likely that the IDS is not set to block or prevent attacks. But also, the firewall allows direct database access from web, which is a design issue. Let's design options accordingly.
What should I do if I get this CISM question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISM NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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