The answer is an Intrusion Prevention System (IPS), as it is the technology designed to distinguish legitimate traffic from DoS attacks by analyzing behavior patterns in real time. An IPS uses both signature-based detection to identify known attack signatures and anomaly-based detection to spot deviations from normal traffic baselines, allowing it to differentiate between benign user requests and malicious volumetric or protocol-based DoS flows. On the ISC2 Certified in Cybersecurity CC exam, this question tests your understanding of network security controls and their specific roles—a common trap is confusing an IPS with a Web Application Firewall (WAF), but remember that WAFs focus on application-layer threats like SQL injection, while an IPS operates at the network and transport layers to block DoS patterns. For a memory tip, think of IPS as the “behavior bouncer” that watches how traffic acts, not just what it says.
ISC2 CC Network Security Practice Question
This CC practice question tests your understanding of network security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 recently experienced a DoS attack targeting their web server. They want to implement a solution that can differentiate between legitimate traffic and attack traffic based on behavior patterns. Which technology should they deploy?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Intrusion Prevention System (IPS)
An Intrusion Prevention System (IPS) is the correct choice because it can analyze traffic patterns and behavior in real time, using signature-based and anomaly-based detection to distinguish legitimate traffic from DoS attack traffic. Unlike a WAF, which focuses on application-layer threats like SQL injection, an IPS can inspect network and transport layers to identify volumetric or protocol-based DoS patterns and actively block malicious flows.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Web Application Firewall (WAF)
Why it's wrong here
A WAF focuses on application-layer attacks like SQL injection, not general DoS behavioral patterns.
✗
Load balancer
Why it's wrong here
A load balancer distributes traffic but does not analyze traffic behavior for attacks.
✓
Intrusion Prevention System (IPS)
Why this is correct
An IPS can perform deep packet inspection and behavioral analysis to detect and block DoS patterns inline.
Related concept
Read the scenario before looking for a memorised answer.
✗
Stateful firewall
Why it's wrong here
A stateful firewall tracks connection state but does not perform behavior-based analysis to differentiate attack traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between a WAF and an IPS, where candidates mistakenly choose WAF because they associate all web server attacks with application-layer defenses, but DoS attacks often operate at lower layers where IPS behavior analysis is required.
Detailed technical explanation
How to think about this question
An IPS uses a combination of signature-based detection (matching known DoS patterns, e.g., SYN flood with a high rate of incomplete handshakes) and anomaly-based detection (establishing a baseline of normal traffic and flagging deviations, such as a sudden spike in ICMP echo requests). Under the hood, the IPS can reassemble packets, inspect payloads, and maintain state tables to correlate events across flows, enabling it to drop malicious packets before they reach the target server. In a real-world scenario, an IPS can mitigate a DNS amplification attack by detecting the abnormal ratio of request-to-response sizes and rate-limiting the offending source IPs.
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.
TExam Day Tips
→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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Intrusion Prevention System (IPS) — An Intrusion Prevention System (IPS) is the correct choice because it can analyze traffic patterns and behavior in real time, using signature-based and anomaly-based detection to distinguish legitimate traffic from DoS attack traffic. Unlike a WAF, which focuses on application-layer threats like SQL injection, an IPS can inspect network and transport layers to identify volumetric or protocol-based DoS patterns and actively block malicious flows.
What should I do if I get this CC question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
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 →
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.
This CC 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 CC 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.