The correct answer is that the corporate network’s RADIUS certificate has expired or is untrusted. This is because WPA2-Enterprise with 802.1X relies on a RADIUS server to authenticate devices, and that server presents a digital certificate to prove its identity; if the certificate has expired or the laptop does not trust it, the authentication handshake fails, blocking access to the corporate network. The guest network, by contrast, often uses WPA2-PSK (a pre-shared key), which bypasses certificate-based authentication entirely, explaining why the laptop can connect there without issue. On the CompTIA A+ Core 2 220-1202 exam, this scenario tests your understanding of enterprise authentication vs. personal mode, and a common trap is assuming the laptop’s wireless adapter is faulty when the real problem is a certificate mismatch. Remember the memory tip: “Guest is PSK, Corp is PKI”—if a device works on guest but not corporate, suspect the certificate.
220-1102 Wireless Security Protocols Practice Question
This 220-1202 practice question tests your understanding of wireless security protocols. 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 user reports that their corporate laptop can connect to the guest Wi-Fi network but not to the internal corporate network. Both networks use WPA2-Enterprise with 802.1X. The laptop works fine on other corporate networks. What is the most likely issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The corporate network's RADIUS certificate has expired or is untrusted.
WPA2-Enterprise uses RADIUS for authentication. A common issue is that the laptop's certificate for the corporate network has expired or is not trusted by the specific RADIUS server. Guest networks often use simpler authentication like PSK, which bypasses certificate requirements.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The laptop's wireless card is faulty.
Why it's wrong here
Incorrect. A faulty card would prevent connection to any network, not just the corporate one.
✓
The corporate network's RADIUS certificate has expired or is untrusted.
Why this is correct
Correct. Expired or untrusted certificates cause 802.1X authentication to fail, while the guest network (likely PSK) works fine.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
The corporate network is using a different SSID than expected.
Why it's wrong here
Incorrect. An SSID mismatch would prevent the laptop from even seeing the network, not just failing authentication.
✗
The laptop's Wi-Fi profile is configured for WPA2-Personal instead of Enterprise.
Why it's wrong here
Incorrect. If the profile were wrong, the laptop would not attempt 802.1X and would likely fail to connect entirely.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 220-1202 question in full detail.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 220-1202 questions on access control and AAA configuration.
Wireless Security Protocols — This question tests Wireless Security Protocols — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The corporate network's RADIUS certificate has expired or is untrusted. — WPA2-Enterprise uses RADIUS for authentication. A common issue is that the laptop's certificate for the corporate network has expired or is not trusted by the specific RADIUS server. Guest networks often use simpler authentication like PSK, which bypasses certificate requirements.
What should I do if I get this 220-1202 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 220-1202 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Authentication checks who the user is.
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