- A
The Wi-Fi adapter is faulty.
Why wrong: Incorrect. A faulty adapter would prevent connection to any Wi-Fi network.
- B
The phone's date and time are incorrect.
Why wrong: Incorrect. Incorrect date/time can cause certificate validation failures, but this is less common than a missing certificate.
- C
The CA certificate for the network is not installed or trusted.
Correct. WPA2-Enterprise requires a trusted CA certificate; without it, the phone cannot authenticate the server.
- D
The phone is using a static IP address.
Why wrong: Incorrect. Static IP configuration would not prevent initial connection; it would cause IP conflicts.
Question 844 of 1,020
Android Cannot Connect to WPA2-Enterprise PEAP
This 220-1201 practice question tests your understanding of mobile device application support. 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 technician is troubleshooting an Android phone that fails to connect to a corporate Wi-Fi network using WPA2-Enterprise with PEAP. The phone connects to other Wi-Fi networks without issue. What is the most likely cause?
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.
Quick Answer
The most likely cause is that the CA certificate for the network is not installed or trusted on the Android device. When an Android phone cannot connect to WPA2-Enterprise PEAP but works fine on other networks, the issue almost always lies in the certificate validation step required by enterprise authentication. PEAP uses a server-side certificate to establish a secure tunnel; without the correct Certificate Authority (CA) certificate installed and marked as trusted, the device will reject the connection as insecure. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of advanced Wi-Fi configuration beyond simple home networks—specifically how 802.1X authentication relies on public key infrastructure. A common trap is assuming the problem is a wrong password or disabled Wi-Fi, but those would affect all networks, not just the corporate one. Remember the memory tip: “PEAP needs a CA to play—no cert, no connect.”
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
✓
The CA certificate for the network is not installed or trusted.
WPA2-Enterprise with PEAP requires the phone to validate the server's identity using a CA certificate. If the CA certificate is missing or untrusted, the EAP-TLS handshake fails, preventing connection even though the phone can connect to other (non-Enterprise) networks. This is the most common cause of such failures in corporate environments.
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.
- ✗
The Wi-Fi adapter is faulty.
Why it's wrong here
Incorrect. A faulty adapter would prevent connection to any Wi-Fi network.
- ✗
The phone's date and time are incorrect.
Why it's wrong here
Incorrect. Incorrect date/time can cause certificate validation failures, but this is less common than a missing certificate.
- ✓
The CA certificate for the network is not installed or trusted.
Why this is correct
Correct. WPA2-Enterprise requires a trusted CA certificate; without it, the phone cannot authenticate the server.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The phone is using a static IP address.
Why it's wrong here
Incorrect. Static IP configuration would not prevent initial connection; it would cause IP conflicts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse PEAP (which requires a server certificate but not a client certificate) with EAP-TLS (which requires both), and incorrectly assume the issue is with the phone's date/time or a faulty adapter, rather than the missing CA certificate needed for the TLS tunnel.
Detailed technical explanation
How to think about this question
PEAP uses a server-side certificate to create a TLS tunnel, then authenticates the client inside that tunnel (often via MSCHAPv2). The phone must trust the issuing CA certificate; without it, the TLS handshake fails with an 'untrusted server certificate' error. In real-world scenarios, IT administrators often deploy the CA certificate via MDM, but a factory-reset or OS update can remove it, causing this exact symptom.
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 220-1201 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.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Mobile Device Application Support — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Mobile Device Application Support — This question tests Mobile Device Application Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CA certificate for the network is not installed or trusted. — WPA2-Enterprise with PEAP requires the phone to validate the server's identity using a CA certificate. If the CA certificate is missing or untrusted, the EAP-TLS handshake fails, preventing connection even though the phone can connect to other (non-Enterprise) networks. This is the most common cause of such failures in corporate environments.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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