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CAS-004 Practice Question: Based on the iptables exhibit, a security analyst…
Network Topology
Based on the iptables exhibit, a security analyst has received an alert that an external IP (203.0.113.5) is attempting to connect to TCP port 3389 on the server. Which of the following best describes the current rule set's treatment of this 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
✓
The connection will be logged and then dropped by the default policy
The rule set has a LOG rule for tcp dpt:3389 from any source, which will log the packet but not explicitly accept or drop it; since the policy in the INPUT chain is DROP, the packet will be dropped after being logged. Option A is incorrect because the LOG rule does not drop, only logs. Option C is incorrect because there is no ACCEPT rule for 3389. Option D is incorrect because the default policy is DROP.
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 connection will be allowed through because there is no explicit DROP rule
Why it's wrong here
Default policy is DROP.
- ✓
The connection will be logged and then dropped by the default policy
Why this is correct
LOG rule logs, then default policy (DROP) drops the packet.
- ✗
The connection will be accepted because there is a LOG rule
Why it's wrong here
LOG does not accept.
- ✗
The connection will be logged and then dropped by the LOG rule
Why it's wrong here
LOG does not drop; it only logs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.