Question 354 of 1,020

Mobile Device Network Connectivity →easyMultiple ChoiceObjective-mapped

Smartphone Connects to Home Wi-Fi But Not Corporate WPA2-Enterprise: 802.1X Credentials

This 220-1201 practice question tests your understanding of mobile device network connectivity. 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 customer reports that their smartphone connects to Wi-Fi at home but cannot connect to the corporate Wi-Fi network at their office. The office uses WPA2-Enterprise with 802.1X authentication. What is the most likely reason for the connectivity failure?

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.

A
The phone's Wi-Fi antenna is damaged.
Why wrong: If the antenna were damaged, the phone likely wouldn't connect to any Wi-Fi, including at home.
B
The corporate network requires a different security protocol like WEP.
Why wrong: WEP is outdated and less secure; modern corporate networks use WPA2 or WPA3, not WEP.
C
The phone does not have the correct 802.1X credentials configured for the corporate SSID.
WPA2-Enterprise uses 802.1X authentication, which requires a username/password or certificate, unlike the home PSK.
D
The phone is out of range of the corporate access point.
Why wrong: If the phone were out of range, it wouldn't see the network at all, but the user reports it can connect to home Wi-Fi, indicating range is not the issue.

Full breakdown with real-world context →

Quick Answer

The answer is that the phone lacks the correct 802.1X credentials configured for the corporate SSID. This is because WPA2-Enterprise relies on 802.1X authentication, which requires a unique username and password, a certificate, or both—unlike a home network that uses WPA2-Personal with a simple pre-shared key (PSK). On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of the difference between authentication methods; a common trap is assuming the phone’s Wi-Fi is broken when it actually just lacks the proper credentials for the enterprise RADIUS server. Remember that when a smartphone connects to home Wi-Fi but not corporate WPA2-Enterprise, the issue is almost never hardware—it’s the missing 802.1X login details. A useful memory tip: “Home uses a key, office needs a login—if it works at home but not at work, check the credentials, not the signal.”

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 phone does not have the correct 802.1X credentials configured for the corporate SSID.

The corporate network uses WPA2-Enterprise with 802.1X authentication, which requires the smartphone to have the correct 802.1X credentials (e.g., username/password or certificate) configured for that specific SSID. Without these credentials, the phone cannot complete the EAP (Extensible Authentication Protocol) handshake with the RADIUS server, even though it can connect to a home WPA2-Personal network. Option C directly addresses this missing configuration.

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 phone's Wi-Fi antenna is damaged.
Why it's wrong here
If the antenna were damaged, the phone likely wouldn't connect to any Wi-Fi, including at home.
✗
The corporate network requires a different security protocol like WEP.
Why it's wrong here
WEP is outdated and less secure; modern corporate networks use WPA2 or WPA3, not WEP.
✓
The phone does not have the correct 802.1X credentials configured for the corporate SSID.
Why this is correct
WPA2-Enterprise uses 802.1X authentication, which requires a username/password or certificate, unlike the home PSK.
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 out of range of the corporate access point.
Why it's wrong here
If the phone were out of range, it wouldn't see the network at all, but the user reports it can connect to home Wi-Fi, indicating range is not the issue.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The 220-1201 exam often tests the distinction between home (WPA2-Personal) and enterprise (WPA2-Enterprise) authentication, and the trap here is that candidates assume any Wi-Fi connection failure is due to range or hardware, overlooking the credential configuration requirement for 802.1X.

Detailed technical explanation

How to think about this question

WPA2-Enterprise uses 802.1X with EAP methods such as EAP-TLS (certificate-based) or PEAP (password-based). The smartphone must have the correct credentials (e.g., a user certificate or a username/password) and trust the RADIUS server's certificate to complete the authentication. A common real-world scenario is that the phone's Wi-Fi profile for the corporate SSID is missing the required CA certificate or the user's identity, causing the EAP exchange to fail at the Access-Challenge step.

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.

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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FAQ

Questions learners often ask

What does this 220-1201 question test?

Mobile Device Network Connectivity — This question tests Mobile Device Network Connectivity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The phone does not have the correct 802.1X credentials configured for the corporate SSID. — The corporate network uses WPA2-Enterprise with 802.1X authentication, which requires the smartphone to have the correct 802.1X credentials (e.g., username/password or certificate) configured for that specific SSID. Without these credentials, the phone cannot complete the EAP (Extensible Authentication Protocol) handshake with the RADIUS server, even though it can connect to a home WPA2-Personal network. Option C directly addresses this missing configuration.

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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