This CS0-003 practice question tests your understanding of security operations. 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.
During a penetration test, a tester successfully exploits a vulnerability in a web application and gains a shell on the backend server. The tester then attempts to pivot to other hosts. Which of the following security controls would be most effective in limiting lateral movement in this scenario?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Network segmentation with strict firewall rules
Network segmentation with strict firewall rules (C) is the most effective control because it directly restricts the ability of an attacker who has compromised one host to initiate connections to other hosts. By enforcing least-privilege network access between segments (e.g., using VLANs and ACLs), lateral movement techniques such as port scanning, SMB relay, or RDP brute force are blocked at the network layer, regardless of the attacker's shell access.
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.
✗
Host-based intrusion prevention system (HIPS)
Why it's wrong here
HIPS can detect and block some attacks, but may not prevent all lateral movement techniques.
✗
Full disk encryption
Why it's wrong here
Encryption protects data at rest but does not prevent network-based lateral movement.
✓
Network segmentation with strict firewall rules
Why this is correct
Segmentation limits the ability to connect to other hosts, hindering lateral movement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Application whitelisting
Why it's wrong here
Whitelisting controls which processes can run, but does not restrict network connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that endpoint controls like HIPS or application whitelisting are sufficient to stop lateral movement, but the trap here is that once an attacker has a shell, they can often bypass or disable host-based controls, whereas network segmentation is a preventive control that operates independently of the compromised host's state.
Detailed technical explanation
How to think about this question
Under the hood, network segmentation relies on Layer 3/4 firewall rules (e.g., using iptables, NSGs, or ACLs) to enforce that only specific source/destination IPs and ports are allowed between segments. For example, a web server in a DMZ should only be permitted to talk to a database server on TCP 3306, not to any host in the internal corporate LAN. In a real-world scenario, even if an attacker gains a shell on the web server, they cannot scan or connect to the internal network because the firewall drops all outbound traffic not matching the allow rules.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Network segmentation with strict firewall rules — Network segmentation with strict firewall rules (C) is the most effective control because it directly restricts the ability of an attacker who has compromised one host to initiate connections to other hosts. By enforcing least-privilege network access between segments (e.g., using VLANs and ACLs), lateral movement techniques such as port scanning, SMB relay, or RDP brute force are blocked at the network layer, regardless of the attacker's shell access.
What should I do if I get this CS0-003 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 CS0-003 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 CS0-003 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.