Question 149 of 1,020

Mobile Device Network Connectivity →easyMultiple ChoiceObjective-mapped

Why Your Device Won't Connect to 5 GHz Wi-Fi

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 can connect to Wi-Fi at home but fails to connect to the company's 5 GHz Wi-Fi network in the office. Other devices connect fine. 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.

A
The smartphone's Wi-Fi antenna is damaged.
Why wrong: If the antenna were damaged, the phone would likely fail on all Wi-Fi networks, not just the 5 GHz one at the office.
B
The office access point is configured for 2.4 GHz only.
Why wrong: The scenario says other devices connect fine, so the access point is broadcasting 5 GHz. The issue is specific to the customer's device location.
C
The smartphone is too far from the office access point for 5 GHz.
5 GHz has shorter range and lower penetration through obstacles. The customer may be in a location where the 5 GHz signal is too weak, while 2.4 GHz still works.
D
The smartphone's Wi-Fi driver needs updating.
Why wrong: A driver issue would likely cause problems on all Wi-Fi networks, not just the 5 GHz band at the office.

Full breakdown with real-world context →

Quick Answer

The answer is that the smartphone is too far from the office access point for 5 GHz Wi-Fi. This is correct because the 5 GHz band offers faster speeds but has a significantly shorter range and is more easily attenuated by walls, doors, and other physical obstacles compared to the 2.4 GHz band. On the CompTIA A+ Core 1 220-1201 exam, this question tests your understanding of wireless frequency characteristics and their real-world limitations, often appearing as a scenario where a device works at home but fails at a larger office. A common trap is assuming the smartphone’s hardware is faulty or that the network password is wrong, but the key clue is that other devices connect fine, isolating the issue to the client’s distance. Remember the memory tip: “5 GHz is fast but doesn’t last—2.4 GHz goes through the floor and door.”

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 smartphone is too far from the office access point for 5 GHz.

The smartphone connects to Wi-Fi at home but fails on the company's 5 GHz network, while other devices connect fine. This points to a client-side range issue: 5 GHz signals have higher attenuation and shorter effective range than 2.4 GHz, so if the smartphone is too far from the office access point, it may detect the network but be unable to maintain a stable connection, whereas other devices closer to the AP connect successfully.

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 smartphone's Wi-Fi antenna is damaged.
Why it's wrong here
If the antenna were damaged, the phone would likely fail on all Wi-Fi networks, not just the 5 GHz one at the office.
✗
The office access point is configured for 2.4 GHz only.
Why it's wrong here
The scenario says other devices connect fine, so the access point is broadcasting 5 GHz. The issue is specific to the customer's device location.
✓
The smartphone is too far from the office access point for 5 GHz.
Why this is correct
5 GHz has shorter range and lower penetration through obstacles. The customer may be in a location where the 5 GHz signal is too weak, while 2.4 GHz still works.
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 smartphone's Wi-Fi driver needs updating.
Why it's wrong here
A driver issue would likely cause problems on all Wi-Fi networks, not just the 5 GHz band at the office.

Common exam traps

Common exam trap: answer the scenario, not the keyword

A common misconception on the CompTIA A+ exam is that a device failing to connect to a 5 GHz network while working on 2.4 GHz must be a hardware or driver problem, when in reality the most common cause is the shorter range of 5 GHz and the client being too far from the access point.

Trap categories for this question

Scenario analysis trap
The scenario says other devices connect fine, so the access point is broadcasting 5 GHz. The issue is specific to the customer's device location.

Detailed technical explanation

How to think about this question

5 GHz Wi-Fi (IEEE 802.11a/n/ac/ax) operates at higher frequencies, which suffer from greater free-space path loss and reduced penetration through obstacles like walls and cubicle partitions. The effective range of 5 GHz is roughly half that of 2.4 GHz under similar conditions; a smartphone at the edge of the 5 GHz coverage zone may experience frequent disconnections or fail to associate entirely, even though the SSID is still visible in the scan list. In enterprise deployments, APs often use adaptive rate selection, but if the client's received signal strength indicator (RSSI) falls below the AP's minimum RSSI threshold for 5 GHz, the AP may reject the association request.

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.

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 smartphone is too far from the office access point for 5 GHz. — The smartphone connects to Wi-Fi at home but fails on the company's 5 GHz network, while other devices connect fine. This points to a client-side range issue: 5 GHz signals have higher attenuation and shorter effective range than 2.4 GHz, so if the smartphone is too far from the office access point, it may detect the network but be unable to maintain a stable connection, whereas other devices closer to the AP connect successfully.

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.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 220-1201

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A user's smartphone intermittently disconnects from a known Wi-Fi network when they move to a different room. The network uses a single access point. What is the most likely cause?

medium

✓ A.The smartphone is connecting to the 5 GHz band, which has poor wall penetration.
B.The access point is overloaded with too many clients.
C.The smartphone's MAC address is being filtered.
D.The smartphone's battery saver mode is turning off Wi-Fi.

Why A: The 5 GHz band offers higher data rates but has significantly poorer wall penetration and range compared to the 2.4 GHz band. When the user moves to a different room, the signal from the single access point attenuates more rapidly at 5 GHz, causing intermittent disconnections. This is the most likely cause because the problem is location-dependent and occurs with a known network.

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