Question 328 of 1,020

Wireless Networking Technologies →hardMultiple ChoiceObjective-mapped

Wi-Fi 6 Backward Compatibility: WPA3 Causing Connection Issues

This 220-1201 practice question tests your understanding of wireless networking technologies. 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 company deploys a new 802.11ax (Wi-Fi 6) access point to support high-density environments. Some older laptops with 802.11ac adapters cannot connect, while newer Wi-Fi 6 laptops work fine. The SSID is broadcast and security is set to WPA2. 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 access point is set to 802.11ax-only mode.
Why wrong: 802.11ax is backward compatible; if set to ax-only, ac devices would not connect, but this is rare and less likely than security mismatch.
B
The laptops have outdated firmware that does not support OFDMA.
Why wrong: OFDMA is a Wi-Fi 6 feature; older adapters simply ignore it and connect using legacy methods.
C
The access point is configured to use WPA3 only.
WPA3 is often enabled by default on Wi-Fi 6 APs; 802.11ac laptops may not support WPA3, causing connection failures.
D
The 5 GHz radio is disabled on the access point.
Why wrong: 802.11ac operates on 5 GHz, but if 5 GHz were disabled, ac laptops would not connect, but the scenario says older ac laptops cannot connect while newer ax ones can, implying 5 GHz is active.

Full breakdown with real-world context →

Quick Answer

The answer is that the access point is configured to use WPA3 only, which breaks backward compatibility with older 802.11ac adapters. While Wi-Fi 6 backward compatibility with WPA3 is a key feature of the 802.11ax standard, the security protocol itself is not backward compatible with WPA2-only hardware. If the access point is set to require WPA3, older laptops that only support WPA2 will fail to authenticate, even though the physical Wi-Fi 6 radio is fully compatible with 802.11ac. On the CompTIA A+ Core 1 220-1201 exam, this traps students who assume Wi-Fi 6 backward compatibility automatically extends to security settings; the common mistake is blaming the radio standard instead of the authentication mismatch. Remember that Wi-Fi 6 can run WPA2, WPA3, or a mixed mode—so if older devices can’t connect, check the security mode first. Memory tip: “Wi-Fi 6 is friendly to old radios, but WPA3-only locks the door on old keys.”

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 access point is configured to use WPA3 only.

Option C is correct because if the access point is configured to use WPA3 only, it will not accept WPA2 connections. Although the SSID is broadcast and security is set to WPA2, the AP enforces WPA3 for authentication, which older 802.11ac laptops do not support. Newer Wi-Fi 6 laptops support WPA3, so they connect successfully. This security protocol mismatch is the most likely cause of the issue.

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 access point is set to 802.11ax-only mode.
Why it's wrong here
802.11ax is backward compatible; if set to ax-only, ac devices would not connect, but this is rare and less likely than security mismatch.
✗
The laptops have outdated firmware that does not support OFDMA.
Why it's wrong here
OFDMA is a Wi-Fi 6 feature; older adapters simply ignore it and connect using legacy methods.
✓
The access point is configured to use WPA3 only.
Why this is correct
WPA3 is often enabled by default on Wi-Fi 6 APs; 802.11ac laptops may not support WPA3, causing connection failures.
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 5 GHz radio is disabled on the access point.
Why it's wrong here
802.11ac operates on 5 GHz, but if 5 GHz were disabled, ac laptops would not connect, but the scenario says older ac laptops cannot connect while newer ax ones can, implying 5 GHz is active.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Candidates often assume that backward compatibility is automatic for all features, but here the trap is that candidates assume WPA2 is always supported on Wi-Fi 6 APs, overlooking that the security configuration can be set to WPA3-only, which breaks connectivity for older WPA2-only clients.

Trap categories for this question

Scenario analysis trap
802.11ac operates on 5 GHz, but if 5 GHz were disabled, ac laptops would not connect, but the scenario says older ac laptops cannot connect while newer ax ones can, implying 5 GHz is active.

Detailed technical explanation

How to think about this question

802.11ax (Wi-Fi 6) certification requires support for WPA3, but the standard allows backward compatibility with WPA2 for mixed deployments. However, if the AP is configured in 'WPA3-only' mode (often called 'WPA3 Transition Disable' or 'WPA3-Enterprise 192-bit'), it will reject WPA2 handshakes. The 802.11ac clients lack the SAE (Simultaneous Authentication of Equals) handshake required for WPA3-Personal, causing authentication failures. In real-world scenarios, this is a common misconfiguration when deploying new Wi-Fi 6 APs without enabling WPA2/WPA3 mixed mode.

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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.

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?

Wireless Networking Technologies — This question tests Wireless Networking Technologies — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The access point is configured to use WPA3 only. — Option C is correct because if the access point is configured to use WPA3 only, it will not accept WPA2 connections. Although the SSID is broadcast and security is set to WPA2, the AP enforces WPA3 for authentication, which older 802.11ac laptops do not support. Newer Wi-Fi 6 laptops support WPA3, so they connect successfully. This security protocol mismatch is the most likely cause of the issue.

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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