CCSM Advanced Firewall Troubleshooting Practice Question
Exhibit
Packet log: 10.1.1.5 -> 10.2.2.5, Action: Drop, Reason: Cleanup rule, Interface: eth0, Security Gateway: GW1
Refer to the exhibit. The traffic is being dropped by the Cleanup rule. However, you are certain a rule exists that allows this traffic. What is the most common reason for this behavior in a complex environment?
⚠ Common exam trap
Candidates often look for complex routing or NAT issues first, overlooking the basic 'First Match' logic where a generic rule higher up in the policy inadvertently intercepts traffic.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rule shadowing by a broader rule located above the intended rule.
Rule shadowing occurs when a more generic rule appears before a specific rule in the Rule Base. Because Check Point processes rules using the 'First Match' principle, the packet hits the first rule that matches its criteria and stops. If a broader rule is placed above the intended rule, the traffic is processed by the broader rule, potentially failing to reach the specific rule designed for that service or destination.
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 Security Policy is not installed on the gateway.
Why it's wrong here
If the policy were not installed, the gateway would likely be using a default 'fail-closed' policy, or potentially the last successfully installed policy. However, logs would typically show 'No policy installed' or similar alerts, and traffic would be dropped globally rather than specifically by the Cleanup rule.
- ✓
Rule shadowing by a broader rule located above the intended rule.
Why this is correct
Rule shadowing is the most common cause of traffic failing to reach an expected rule. Because the gateway uses 'First Match' logic, any rule placed higher in the list with more permissive criteria will intercept the packet, causing it to fall through to the Cleanup rule eventually.
- ✗
The gateway's connection table is full and cannot process new connections.
Why it's wrong here
If the connection table were full, the gateway would drop all new connections, not just specific ones. Such a failure would be global, and log entries would indicate connection table exhaustion rather than specifically naming the 'Cleanup rule' as the cause of the drop for this specific source/destination pair.
- ✗
The interface is set to 'Strict' Anti-Spoofing mode.
Why it's wrong here
Anti-spoofing drops are distinct from policy drops. If anti-spoofing were the cause, the log would explicitly state 'Anti-Spoofing' as the reason for the drop. In this scenario, the log explicitly identifies the 'Cleanup rule', which confirms that the packet successfully passed initial interface checks but failed the policy evaluation.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Check Point exam blueprint
This CCSM practice question is part of Courseiva's free Check Point certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CCSM exam.