- A
Implement IP blacklisting by manually adding offending IP addresses to the firewall's deny list
Why wrong: IP blacklisting is reactive and cannot keep up with a large distributed attack. It also risks blocking legitimate users that share IP ranges with attackers, and requires constant manual updates.
- B
Change the web server port from 443 to a non-standard high port
Why wrong: Changing the port is a form of security through obscurity. Attackers can easily scan for open ports, so this provides no real protection and may cause connectivity issues for some users.
- C
Deploy a Web Application Firewall (WAF) configured with rate limiting and CAPTCHA challenges
A WAF can automatically detect and mitigate brute-force patterns by rate-limiting requests from suspicious IPs, presenting CAPTCHAs to verify human users, and applying other application-layer controls without modifying the application.
- D
Enable SSH access to the web server for administrative purposes
Why wrong: Enabling SSH does not mitigate the brute-force attack on the web application. It adds an additional attack surface and is unrelated to the issue.
Quick Answer
The answer is to deploy a Web Application Firewall (WAF) configured with rate limiting and CAPTCHA challenges. This is the most effective first step to mitigate web application brute force attacks because a WAF operates at the application layer, inspecting HTTP/S traffic to enforce policies like rate limiting per IP and presenting CAPTCHAs, which block automated login attempts without requiring changes to the custom web application. On the Systems Security Certified Practitioner (SSCP) exam, this scenario tests your understanding of access controls and operational security—specifically how a WAF provides a cost-effective, scalable defense against distributed attacks that overwhelm simple IP blacklisting. A common trap is choosing IP blacklisting, but that fails against attacks from thousands of diverse IPs; remember, a WAF’s ability to apply behavioral analysis and challenge-response mechanisms is key. Memory tip: “WAF blocks the flood with rate and CAPTCHA blood.”
SSCP Network and Communications Security Practice Question
This SSCP practice question tests your understanding of network and communications security. 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.
A financial services company has recently deployed a new customer-facing web application on port 443. The application is essential for client transactions. Within the first week, the security team's monitoring system detected thousands of failed login attempts originating from a wide range of IP addresses across multiple countries. The attempts are using common usernames and passwords, indicating a coordinated brute-force attack. The company's perimeter firewall is configured with a default allow rule for inbound TCP traffic on port 443 to the web server's public IP address. The company operates with a small IT team and has a limited security budget. The web application is custom-developed and cannot be modified quickly. The security analyst must recommend a solution to mitigate the attack while maintaining availability for legitimate users. Which of the following is the most effective first step?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
Deploy a Web Application Firewall (WAF) configured with rate limiting and CAPTCHA challenges
Deploying a Web Application Firewall (WAF) with rate limiting and CAPTCHA is the most effective solution because it can identify and block malicious traffic patterns without requiring application changes. It operates at the application layer and can enforce policies such as rate limiting per IP, geolocation blocking, and CAPTCHA challenges, which directly mitigate brute-force attacks while minimizing impact on legitimate users. Other options are less effective: IP blacklisting is reactive and cannot handle distributed attacks; changing ports only provides obscurity; enabling SSH does not address the web application attack.
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.
- ✗
Implement IP blacklisting by manually adding offending IP addresses to the firewall's deny list
Why it's wrong here
IP blacklisting is reactive and cannot keep up with a large distributed attack. It also risks blocking legitimate users that share IP ranges with attackers, and requires constant manual updates.
- ✗
Change the web server port from 443 to a non-standard high port
Why it's wrong here
Changing the port is a form of security through obscurity. Attackers can easily scan for open ports, so this provides no real protection and may cause connectivity issues for some users.
- ✓
Deploy a Web Application Firewall (WAF) configured with rate limiting and CAPTCHA challenges
Why this is correct
A WAF can automatically detect and mitigate brute-force patterns by rate-limiting requests from suspicious IPs, presenting CAPTCHAs to verify human users, and applying other application-layer controls without modifying the application.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Enable SSH access to the web server for administrative purposes
Why it's wrong here
Enabling SSH does not mitigate the brute-force attack on the web application. It adds an additional attack surface and is unrelated to the issue.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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 SSCP NAT questions on configuration and troubleshooting.
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Network and Communications Security — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this SSCP question test?
Network and Communications Security — This question tests Network and Communications Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Deploy a Web Application Firewall (WAF) configured with rate limiting and CAPTCHA challenges — Deploying a Web Application Firewall (WAF) with rate limiting and CAPTCHA is the most effective solution because it can identify and block malicious traffic patterns without requiring application changes. It operates at the application layer and can enforce policies such as rate limiting per IP, geolocation blocking, and CAPTCHA challenges, which directly mitigate brute-force attacks while minimizing impact on legitimate users. Other options are less effective: IP blacklisting is reactive and cannot handle distributed attacks; changing ports only provides obscurity; enabling SSH does not address the web application attack.
What should I do if I get this SSCP 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 SSCP NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
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