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Question 524 of 1,705

Network Security, Compliance and Governance →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the new Suricata IPS drop rule was placed before the allow rules in the rule group, and because AWS Network Firewall evaluates rules in order from top to bottom, the drop rule matches first and drops all traffic when its source IP is inadvertently set to 'any' instead of the specific IP address. This happens because rule order is deterministic—once a packet matches a rule with an action like 'drop', evaluation stops, so any subsequent allow rules for HTTP and HTTPS are never reached. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of stateful rule group evaluation order and the common misconfiguration of overly broad Suricata signatures. A frequent trap is assuming that allow rules will override a drop rule placed above them, but the firewall’s first-match logic prevents that. Memory tip: “First match wins, so drop before allow kills the flow.”

ANS-C01 Network Security, Compliance and Governance Practice Question

This ANS-C01 practice question tests your understanding of network security, compliance and governance. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 company uses AWS Network Firewall to inspect traffic between VPCs in a transit gateway setup. They have a rule group that allows HTTP and HTTPS traffic to a web server in a production VPC. Recently, the security team added a new Suricata IPS rule to block traffic from a specific IP address. After deploying the updated rule group, they notice that all traffic to the web server is being dropped, even from allowed IPs. The firewall logs show the new rule is triggering for all traffic, not just the specific IP. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1mediummultiple choice

Full question →

A
The web server's security group is blocking traffic from the firewall's IP range after the firewall adds its source IP.
Why wrong: Network Firewall does not change source IP; it forwards traffic. Security groups would not cause the firewall logs to show the rule triggering.
B
The new Suricata rule uses the 'drop' action instead of 'reject', causing all packets to be dropped.
Why wrong: The action 'drop' is appropriate for blocking. The issue is that the rule matches all traffic, not just the specific IP.
C
The new rule is placed before the allow rules in the rule group, and due to the order of evaluation, the drop rule matches first and drops all traffic because the rule's source IP is set to 'any' instead of the specific IP.
In Suricata rules, order matters. If the new rule has an incorrect source IP (e.g., using 'any' or a broad range), it will match all traffic and drop it before allow rules are evaluated. The rule should have the specific IP to block.
D
The rule group is attached to the firewall policy in the wrong direction (e.g., outbound instead of inbound).
Why wrong: Direction matters, but if it were wrong, traffic might not be inspected at all. The logs show the rule is triggering, so it is being evaluated.

Full breakdown with real-world context →

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 new rule is placed before the allow rules in the rule group, and due to the order of evaluation, the drop rule matches first and drops all traffic because the rule's source IP is set to 'any' instead of the specific IP.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

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 web server's security group is blocking traffic from the firewall's IP range after the firewall adds its source IP.
Why it's wrong here
Network Firewall does not change source IP; it forwards traffic. Security groups would not cause the firewall logs to show the rule triggering.
✗
The new Suricata rule uses the 'drop' action instead of 'reject', causing all packets to be dropped.
Why it's wrong here
The action 'drop' is appropriate for blocking. The issue is that the rule matches all traffic, not just the specific IP.
✓
The new rule is placed before the allow rules in the rule group, and due to the order of evaluation, the drop rule matches first and drops all traffic because the rule's source IP is set to 'any' instead of the specific IP.
Why this is correct
In Suricata rules, order matters. If the new rule has an incorrect source IP (e.g., using 'any' or a broad range), it will match all traffic and drop it before allow rules are evaluated. The rule should have the specific IP to block.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The rule group is attached to the firewall policy in the wrong direction (e.g., outbound instead of inbound).
Why it's wrong here
Direction matters, but if it were wrong, traffic might not be inspected at all. The logs show the rule is triggering, so it is being evaluated.

Common exam traps

Common exam trap: answer the scenario, not the keyword

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
Network Firewall does not change source IP; it forwards traffic. Security groups would not cause the firewall logs to show the rule triggering.

Detailed technical explanation

How to think about this question

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.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

What to study next

Got this wrong? Here's your next step.

Identify which ANS-C01 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.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The new rule is placed before the allow rules in the rule group, and due to the order of evaluation, the drop rule matches first and drops all traffic because the rule's source IP is set to 'any' instead of the specific IP.

What should I do if I get this ANS-C01 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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