EAP-TLS is the correct choice because it is the only EAP method that enforces mutual authentication using certificates on both the client and the server, meeting the security policy requirement. This works by establishing a TLS tunnel where each side presents a digital certificate signed by a trusted Certificate Authority, allowing both endpoints to cryptographically verify each other’s identity before any data exchange occurs. On the CompTIA Network+ N10-009 exam, this concept often appears in 802.1X deployment scenarios where the question explicitly mentions “certificates on both ends” or “mutual authentication”—a common trap is confusing EAP-TLS with EAP-PEAP or EAP-TTLS, which only authenticate the server by default. Remember the key differentiator: TLS requires a full PKI with client certificates, while other methods rely on passwords or server-only certificates. A useful memory tip is to think of the “S” in TLS as standing for “both Sides” need certificates.
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.
A network engineer is deploying 802.1X authentication for a wireless network. The security policy requires mutual authentication between the client and the network using certificates on both ends. Which EAP method should the engineer select?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
EAP-TLS
EAP-TLS (Transport Layer Security) is the correct choice because it provides mutual authentication using certificates on both the client and the server, satisfying the security policy requirement. Unlike other EAP methods, EAP-TLS requires a PKI with certificates installed on both endpoints, ensuring that each side validates the other's identity before establishing the connection.
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.
✗
EAP-MD5
Why it's wrong here
EAP-MD5 is a password-based challenge-response that does not provide mutual authentication or certificate support.
✓
EAP-TLS
Why this is correct
EAP-TLS uses certificates on both the server and client, providing strong mutual authentication.
Related concept
Read the scenario before looking for a memorised answer.
✗
PEAP
Why it's wrong here
PEAP requires only a server-side certificate; it does not require a client certificate for mutual authentication.
✗
EAP-FAST
Why it's wrong here
EAP-FAST uses a PAC and can support mutual authentication but typically does not require client certificates.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between EAP methods that use certificates on both ends versus those that use certificates only on the server side, leading candidates to mistakenly choose PEAP or EAP-FAST when the question explicitly requires mutual certificate authentication.
Detailed technical explanation
How to think about this question
EAP-TLS is defined in RFC 5216 and operates by establishing a TLS handshake where both the client and server present X.509 certificates, with each side validating the other's certificate chain against a trusted root CA. In a real-world deployment, the network engineer must ensure that the RADIUS server (e.g., Cisco ISE or FreeRADIUS) is configured with a server certificate and that each client device has a unique client certificate installed, often managed via SCEP or manual enrollment.
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 practitioner preparing for the N10-009 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: EAP-TLS — EAP-TLS (Transport Layer Security) is the correct choice because it provides mutual authentication using certificates on both the client and the server, satisfying the security policy requirement. Unlike other EAP methods, EAP-TLS requires a PKI with certificates installed on both endpoints, ensuring that each side validates the other's identity before establishing the connection.
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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