- A
Virtual private network (VPN)
Why wrong: VPNs provide encrypted tunnels but often allow broad network access, contrary to zero trust principles.
- B
Network Access Control (NAC)
Why wrong: NAC controls endpoint access to the network but is not the core of zero trust policy enforcement.
- C
Next-generation firewall (NGFW)
Why wrong: NGFW provides deep inspection but not the granular identity-based access control typical of zero trust.
- D
Software-defined perimeter (SDP)
SDP creates a dynamically provisioned perimeter that authenticates users and devices before granting access to specific resources.
Question 785 of 1,000
CISSP Communication and Network Security Practice Question
This CISSP practice question tests your understanding of communication and 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 security team is implementing a zero trust architecture. Which component is essential to enforce access decisions based on user identity, device posture, and context before granting access to resources?
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
✓
Software-defined perimeter (SDP)
A software-defined perimeter (SDP) is the essential component for enforcing access decisions based on user identity, device posture, and context in a zero trust architecture. SDP creates a dynamic, encrypted micro-perimeter around each resource, requiring authentication and authorization before any connection is established, effectively hiding the resource from unauthorized users. This aligns with the zero trust principle of 'never trust, always verify' by evaluating identity, device health, and contextual factors (e.g., location, time) before granting 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.
- ✗
Virtual private network (VPN)
Why it's wrong here
VPNs provide encrypted tunnels but often allow broad network access, contrary to zero trust principles.
- ✗
Network Access Control (NAC)
Why it's wrong here
NAC controls endpoint access to the network but is not the core of zero trust policy enforcement.
- ✗
Next-generation firewall (NGFW)
Why it's wrong here
NGFW provides deep inspection but not the granular identity-based access control typical of zero trust.
- ✓
Software-defined perimeter (SDP)
Why this is correct
SDP creates a dynamically provisioned perimeter that authenticates users and devices before granting access to specific resources.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Network Access Control (NAC) with zero trust because both involve device posture checks, but NAC is a pre-admission network-level control, whereas SDP provides per-session, application-level access control that is fundamental to zero trust architecture.
Detailed technical explanation
How to think about this question
SDP, defined by the Cloud Security Alliance (CSA), uses a controller to authenticate users and devices, then dynamically creates encrypted tunnels (often via DTLS or TLS) between the user and the specific resource gateway, ensuring no lateral movement. Under the hood, SDP leverages a 'black cloud' approach where resources are invisible to unauthorized clients until the controller validates identity, device posture (e.g., OS patch level, antivirus status), and context (e.g., geolocation), then issues a signed token for the gateway. In a real-world scenario, an SDP can revoke access mid-session if a device's posture changes (e.g., antivirus disabled), enforcing continuous verification.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Communication and Network Security — study guide chapter
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FAQ
Questions learners often ask
What does this CISSP question test?
Communication and Network Security — This question tests Communication and Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Software-defined perimeter (SDP) — A software-defined perimeter (SDP) is the essential component for enforcing access decisions based on user identity, device posture, and context in a zero trust architecture. SDP creates a dynamic, encrypted micro-perimeter around each resource, requiring authentication and authorization before any connection is established, effectively hiding the resource from unauthorized users. This aligns with the zero trust principle of 'never trust, always verify' by evaluating identity, device health, and contextual factors (e.g., location, time) before granting access.
What should I do if I get this CISSP 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
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Last reviewed: Jul 4, 2026
This CISSP 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 CISSP exam.
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