- A
SSL VPN with client certificate authentication
Why wrong: Client certificates provide strong authentication but do not enforce patch-level compliance or two-factor authentication inherently.
- B
IPsec VPN using preshared keys
Why wrong: Preshared keys are a single-factor authentication method and do not support compliance checks. This does not meet policy requirements.
- C
NAC integrated with a reverse proxy
Why wrong: NAC can enforce compliance, but a reverse proxy is specific to web applications, not general VPN remote access.
- D
VPN with RADIUS authentication and posture assessment
RADIUS can enforce two-factor authentication (e.g., via OTP) and work with a NAC (posture) server to check client health (patch levels) before allowing full VPN access.
Question 268 of 520
N10-009 Network Security Practice Question
This N10-009 practice question tests your understanding of network security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An organization's security policy requires that all remote access VPN connections use two-factor authentication and that the VPN clients are compliant with the latest patch levels before gaining network access. Which technology combination provides these capabilities?
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
✓
VPN with RADIUS authentication and posture assessment
Option D is correct because RADIUS authentication can enforce two-factor authentication (e.g., via token or OTP), and posture assessment (often via Network Access Control or a VPN posture plugin) checks the client's patch level before granting network access. This combination directly satisfies the policy requirements for both multi-factor authentication and endpoint compliance verification.
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.
- ✗
SSL VPN with client certificate authentication
Why it's wrong here
Client certificates provide strong authentication but do not enforce patch-level compliance or two-factor authentication inherently.
When this WOULD be correct
A question that asks for a remote access VPN solution providing strong authentication without requiring endpoint compliance checks, such as 'Which VPN technology uses client certificates for authentication and operates at the transport layer?'
- ✗
IPsec VPN using preshared keys
Why it's wrong here
Preshared keys are a single-factor authentication method and do not support compliance checks. This does not meet policy requirements.
When this WOULD be correct
This option would be correct for a question asking for a simple, low-overhead VPN setup for site-to-site connections where strong authentication is not required and no client compliance checks are needed.
- ✗
NAC integrated with a reverse proxy
Why it's wrong here
NAC can enforce compliance, but a reverse proxy is specific to web applications, not general VPN remote access.
- ✓
VPN with RADIUS authentication and posture assessment
Why this is correct
RADIUS can enforce two-factor authentication (e.g., via OTP) and work with a NAC (posture) server to check client health (patch levels) before allowing full VPN access.
Related concept
Read the scenario before looking for a memorised answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓VPN with RADIUS authentication and posture assessmentCorrect answer▾
Why this is correct
RADIUS can enforce two-factor authentication (e.g., via OTP) and work with a NAC (posture) server to check client health (patch levels) before allowing full VPN access.
✗SSL VPN with client certificate authenticationWrong answer — click to see why▾
Why this is wrong here
SSL VPN with client certificate authentication provides two-factor authentication (certificate + something else) but does not include posture assessment to verify patch compliance before granting network access.
★ When this WOULD be the correct answer
A question that asks for a remote access VPN solution providing strong authentication without requiring endpoint compliance checks, such as 'Which VPN technology uses client certificates for authentication and operates at the transport layer?'
Why candidates choose this
Candidates may associate SSL VPNs with secure remote access and client certificates with two-factor authentication, overlooking the additional requirement for posture assessment.
✗IPsec VPN using preshared keysWrong answer — click to see why▾
Why this is wrong here
IPsec VPN using preshared keys provides only single-factor authentication (the preshared key) and does not include any mechanism for posture assessment to verify client patch compliance.
★ When this WOULD be the correct answer
This option would be correct for a question asking for a simple, low-overhead VPN setup for site-to-site connections where strong authentication is not required and no client compliance checks are needed.
Why candidates choose this
Candidates may think preshared keys are sufficient for authentication and overlook the two-factor and posture assessment requirements, or they may confuse IPsec with more advanced authentication methods.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'two-factor authentication' with simply using a certificate (Option A) or a preshared key (Option B), failing to recognize that posture assessment is a separate, critical requirement that RADIUS combined with a NAC or posture system uniquely fulfills.
Detailed technical explanation
How to think about this question
RADIUS can integrate with an authentication server (e.g., Microsoft NPS or FreeRADIUS) to enforce two-factor methods like time-based one-time passwords (TOTP) or hardware tokens. Posture assessment typically uses a client-side agent or a network access control (NAC) solution to evaluate the endpoint against a compliance policy (e.g., checking for specific KB patches via Windows Update API or a custom script) before allowing full VPN tunnel establishment. In real-world deployments, this is often implemented with Cisco AnyConnect Secure Mobility Client using a posture module that communicates with a Cisco ISE (Identity Services Engine) for both authentication and compliance checks.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this N10-009 question test?
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: VPN with RADIUS authentication and posture assessment — Option D is correct because RADIUS authentication can enforce two-factor authentication (e.g., via token or OTP), and posture assessment (often via Network Access Control or a VPN posture plugin) checks the client's patch level before granting network access. This combination directly satisfies the policy requirements for both multi-factor authentication and endpoint compliance verification.
What should I do if I get this N10-009 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.
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Last reviewed: Jun 11, 2026
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