The answer is 802.1X with EAP-TLS, the strongest wireless authentication method for enterprise networks using a RADIUS server. This is correct because EAP-TLS requires both the client and the RADIUS server to present valid X.509 certificates, creating mutual authentication that eliminates the risk of credential theft, dictionary attacks, or man-in-the-middle exploits. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of how certificate-based authentication provides superior security over password-based methods like PEAP or EAP-FAST, and a common trap is confusing EAP-TLS with EAP-TTLS, which only requires a server-side certificate. Remember the memory tip: “TLS means Two-sided certificates for Lock-tight Security.”
N10-009 Network Security Practice Question
This N10-009 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 wants to deploy a wireless network with the highest level of security for client authentication. The network will use a RADIUS server. Which authentication method should be used?
Why wrong: WPA2-PSK uses a pre-shared key and does not use a RADIUS server; it is less secure and not enterprise-grade.
B
WPA3-SAE
Why wrong: WPA3-SAE is designed for personal networks and does not typically integrate with a RADIUS server for authentication.
C
802.1X with EAP-TLS
EAP-TLS provides mutual authentication using certificates on both client and server, offering the highest level of security for enterprise wireless.
D
802.1X with PEAP
Why wrong: PEAP uses a server certificate and client passwords; it is secure but less robust than EAP-TLS because it does not require client certificates.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
802.1X with EAP-TLS
Option C is correct because 802.1X with EAP-TLS provides certificate-based mutual authentication, eliminating the risk of credential theft or dictionary attacks. This is the strongest authentication method for enterprise wireless networks, as it requires both the client and the RADIUS server to present valid X.509 certificates, ensuring a cryptographically verified identity on both sides.
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.
✗
WPA2-PSK
Why it's wrong here
WPA2-PSK uses a pre-shared key and does not use a RADIUS server; it is less secure and not enterprise-grade.
✗
WPA3-SAE
Why it's wrong here
WPA3-SAE is designed for personal networks and does not typically integrate with a RADIUS server for authentication.
✓
802.1X with EAP-TLS
Why this is correct
EAP-TLS provides mutual authentication using certificates on both client and server, offering the highest level of security for enterprise wireless.
Related concept
Read the scenario before looking for a memorised answer.
✗
802.1X with PEAP
Why it's wrong here
PEAP uses a server certificate and client passwords; it is secure but less robust than EAP-TLS because it does not require client certificates.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse PEAP with EAP-TLS because both use TLS, but PEAP only authenticates the server with a certificate while the client authenticates with a password (e.g., MSCHAPv2), making it less secure than full mutual certificate authentication in EAP-TLS.
Detailed technical explanation
How to think about this question
EAP-TLS (RFC 5216) requires both the supplicant and the authentication server to present digital certificates, which are validated against a trusted root CA, providing mutual authentication and a secure TLS tunnel for key derivation. In a real-world deployment, this eliminates the need for user passwords and allows integration with a PKI for automated certificate enrollment, making it the preferred choice for high-security environments like government or finance. A subtle behavior is that EAP-TLS can use certificate revocation lists (CRLs) or OCSP to revoke compromised client certificates, a feature not available in password-based methods.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 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: 802.1X with EAP-TLS — Option C is correct because 802.1X with EAP-TLS provides certificate-based mutual authentication, eliminating the risk of credential theft or dictionary attacks. This is the strongest authentication method for enterprise wireless networks, as it requires both the client and the RADIUS server to present valid X.509 certificates, ensuring a cryptographically verified identity on both sides.
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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Question Discussion
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