The answer is a RADIUS server, because WPA2-Enterprise relies on the 802.1X authentication framework, which cannot function without a central authentication server to handle the Extensible Authentication Protocol (EAP) exchange. The RADIUS server provides the critical AAA services—authentication, authorization, and accounting—validating each user’s credentials against a directory like Active Directory, then securely delivering the Pairwise Master Key (PMK) to the access point. On the CompTIA Network+ N10-009 exam, this concept tests your understanding that WPA2-Enterprise is not a simple pre-shared key model; a common trap is confusing it with WPA2-Personal, which uses a single shared passphrase. Remember that “Enterprise” always implies a RADIUS server for per-user authentication. A helpful memory tip: think of RADIUS as the “bouncer” checking each user’s ID individually, while WPA2-Personal is like a single key for the whole building.
N10-009 Network Implementation Practice Question
This N10-009 practice question tests your understanding of network implementation. 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.
A network administrator is implementing a new wireless network that will use WPA2-Enterprise. Which of the following must be configured on the network to support this security method?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A RADIUS server
WPA2-Enterprise uses 802.1X authentication, which requires a RADIUS server to centralize authentication, authorization, and accounting (AAA). The RADIUS server validates user credentials (e.g., against Active Directory or LDAP) and distributes the Pairwise Master Key (PMK) to the access point, enabling per-user, per-session encryption keys. Without a RADIUS server, the enterprise authentication framework cannot function.
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.
✓
A RADIUS server
Why this is correct
WPA2-Enterprise relies on 802.1X, which requires a RADIUS server to handle authentication.
Related concept
Read the scenario before looking for a memorised answer.
✗
A pre-shared key
Why it's wrong here
A pre-shared key is used in WPA2-Personal, not Enterprise, which requires per-user authentication.
✗
A certificate authority
Why it's wrong here
While a CA can provide certificates for server authentication, it is not a required component for the wireless network itself.
✗
A VPN concentrator
Why it's wrong here
A VPN concentrator is for remote access VPNs, not for local wireless authentication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse WPA2-Enterprise with WPA2-Personal and assume a pre-shared key is required, or they overgeneralize the role of a certificate authority, thinking it is mandatory for all enterprise Wi-Fi deployments when it is only required for specific EAP methods like EAP-TLS.
Detailed technical explanation
How to think about this question
WPA2-Enterprise relies on the 802.1X framework, where the supplicant (client) authenticates to the authenticator (AP) via an EAP method, and the AP forwards RADIUS Access-Request packets to the RADIUS server. The RADIUS server then derives a PMK and sends it to the AP over a secure RADIUS channel (using a shared secret), which the AP uses to complete the 4-way handshake with the client. In real-world deployments, the RADIUS server often integrates with a directory service like Active Directory, and the choice of EAP method (e.g., EAP-TLS, PEAP, EAP-TTLS) determines whether a CA is needed for client certificates or server validation.
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.
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 Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A RADIUS server — WPA2-Enterprise uses 802.1X authentication, which requires a RADIUS server to centralize authentication, authorization, and accounting (AAA). The RADIUS server validates user credentials (e.g., against Active Directory or LDAP) and distributes the Pairwise Master Key (PMK) to the access point, enabling per-user, per-session encryption keys. Without a RADIUS server, the enterprise authentication framework cannot function.
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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