Quick Answer
The answer is data loss prevention (DLP), network segmentation, and access controls. Network segmentation is effective because it divides the network into isolated segments using VLANs or firewalls, limiting lateral movement and containing the blast radius of an internal breach. DLP monitors and blocks unauthorized data exfiltration, while access controls enforce least privilege to restrict what internal users can reach. On the Systems Security Certified Practitioner SSCP exam, this topic tests your understanding of defense-in-depth against insider threats—a common trap is focusing only on perimeter defenses like firewalls, forgetting that internal threats require internal controls. Remember the mnemonic “DAN” for DLP, Access controls, and Network segmentation to recall the three pillars of internal threat defense.
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.
Which THREE are effective controls against internal network threats?
Network segmentation
Isolates sensitive systems to contain breaches.
Employee security awareness training
Educates users to avoid risky actions.
Intrusion detection system (IDS)
Why wrong: Detects but does not prevent internal threats.
Single sign-on (SSO)
Why wrong: Convenience feature, not a security control against internal threats.
Data loss prevention (DLP)
Monitors and blocks unauthorized data transfers.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Network segmentation
Network segmentation (A) is effective because it divides the network into isolated segments, limiting lateral movement of threats. By using VLANs or firewalls, an attacker who compromises one segment cannot easily access other critical systems, reducing the blast radius of an internal breach.
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.
Network segmentation
Why this is correct
Isolates sensitive systems to contain breaches.
Related concept
Read the scenario before looking for a memorised answer.
Employee security awareness training
Why this is correct
Educates users to avoid risky actions.
Related concept
Read the scenario before looking for a memorised answer.
Intrusion detection system (IDS)
Why it's wrong here
Detects but does not prevent internal threats.
Single sign-on (SSO)
Why it's wrong here
Convenience feature, not a security control against internal threats.
Data loss prevention (DLP)
Why this is correct
Monitors and blocks unauthorized data transfers.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
ISC2 often tests the distinction between detection and prevention, so candidates mistakenly choose IDS (C) as a control against internal threats, but it only detects, not blocks, unlike network segmentation or DLP which actively prevent or contain threats.
Detailed technical explanation
Network segmentation relies on Layer 2 (VLANs) or Layer 3 (subnets with ACLs) isolation, often enforced by 802.1Q trunking or firewall rules. In a real-world scenario, a zero-trust architecture uses microsegmentation to enforce per-application access, preventing a compromised workstation from pivoting to a database server even if both are on the same physical network. Employee security awareness training reduces social engineering and phishing risks, which are common internal vectors, by teaching users to recognize malicious emails or suspicious behavior. Data loss prevention (DLP) monitors and blocks unauthorized data exfiltration via protocols like SMTP, HTTP, or USB, using content inspection rules to enforce policies on sensitive data.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network and Communications Security — study guide chapter
Learn the concepts, then practise the questions
Network and Communications Security practice questions
Targeted practice on this topic area only
All SSCP questions
504 questions across all exam domains
Systems Security Certified Practitioner SSCP study guide
Full concept coverage aligned to exam objectives
SSCP 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 SSCP questions linked to Risk Identification, Monitoring and Analysis.
Practise SSCP questions linked to Network and Communications Security.
Practise SSCP questions linked to Systems and Application Security.
Practise SSCP questions linked to Security Operations and Administration.
Practise SSCP questions linked to Incident Response and Recovery.
Practise SSCP questions linked to Access Controls.
Practise SSCP questions linked to Cryptography.
Practise SSCP questions linked to SSCP fundamentals.
Practise SSCP questions linked to SSCP scenario.
Practise SSCP questions linked to SSCP troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
The correct answer is: Network segmentation — Network segmentation (A) is effective because it divides the network into isolated segments, limiting lateral movement of threats. By using VLANs or firewalls, an attacker who compromises one segment cannot easily access other critical systems, reducing the blast radius of an internal breach.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 30, 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.
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.