Quick Answer
The answer is that HTTP is allowed from any source. This is correct because the firewall’s INPUT chain enforces a default DROP policy, meaning any traffic not explicitly permitted by an ACCEPT rule is automatically discarded. In this rule set, HTTP on port 80 has an ACCEPT rule with no source restriction, so it passes from any IP, while SSH is restricted to the 192.168.1.0/24 subnet, and ICMP is allowed broadly. On the CompTIA SecurityX CAS-004 exam, firewall rule analysis questions test your ability to trace packet flow against a default DROP policy, a common scenario where candidates mistakenly assume a default ALLOW or overlook the order of rules. A frequent trap is forgetting that a default DROP means only explicitly listed services are permitted, regardless of logging rules. To remember this, think: “Default DROP means you must explicitly open the door—no rule, no access.”
This CAS-004 practice question tests your understanding of application environment, configuration and security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A security analyst is reviewing the firewall rules. Which of the following best describes the rule set's effect?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
HTTP is allowed from any source
The first rule accepts TCP on port 80 from any source (0.0.0.0/0).
Default input policy is ACCEPT
Why wrong: The default policy is DROP, as shown in the first line.
ICMP is logged
Why wrong: ICMP is accepted, but logging is done by the LOG rule for all traffic, not specifically for ICMP.
SSH is allowed from any source
Why wrong: SSH is only allowed from the 192.168.1.0/24 subnet.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
HTTP is allowed from any source
The INPUT chain has a default policy of DROP. Only traffic matching explicit ACCEPT rules is allowed. HTTP (port 80) is accepted from any source; SSH (port 22) is accepted only from 192.168.1.0/24; ICMP is accepted from any; all other traffic is logged and then dropped (due to default DROP).
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
HTTP is allowed from any source
Why this is correct
The first rule accepts TCP on port 80 from any source (0.0.0.0/0).
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Default input policy is ACCEPT
Why it's wrong here
The default policy is DROP, as shown in the first line.
ICMP is logged
Why it's wrong here
ICMP is accepted, but logging is done by the LOG rule for all traffic, not specifically for ICMP.
SSH is allowed from any source
Why it's wrong here
SSH is only allowed from the 192.168.1.0/24 subnet.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The default policy is DROP, as shown in the first line.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Application Environment, Configuration and Security — study guide chapter
Learn the concepts, then practise the questions
Application Environment, Configuration and Security practice questions
Targeted practice on this topic area only
All CAS-004 questions
510 questions across all exam domains
CompTIA SecurityX CAS-004 study guide
Full concept coverage aligned to exam objectives
CAS-004 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise CAS-004 questions linked to Scripting, Containers and Automation.
Practise CAS-004 questions linked to Application Environment, Configuration and Security.
Practise CAS-004 questions linked to Governance, Risk and Compliance.
Practise CAS-004 questions linked to Security Engineering.
Practise CAS-004 questions linked to Security Architecture.
Practise CAS-004 questions linked to Security Operations.
Practise CAS-004 questions linked to CAS-004 fundamentals.
Practise CAS-004 questions linked to CAS-004 scenario.
Practise CAS-004 questions linked to CAS-004 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
The correct answer is: HTTP is allowed from any source — The INPUT chain has a default policy of DROP. Only traffic matching explicit ACCEPT rules is allowed. HTTP (port 80) is accepted from any source; SSH (port 22) is accepted only from 192.168.1.0/24; ICMP is accepted from any; all other traffic is logged and then dropped (due to default DROP).
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This CAS-004 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-004 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.