- A
802.11ac
Why wrong: 802.11ac operates primarily on 5 GHz, which has less range and poorer penetration through obstacles like metal and concrete.
- B
802.11ax (Wi-Fi 6)
Why wrong: Wi-Fi 6 can use both bands, but its 5 GHz band still has less range. The 2.4 GHz band is better for penetration, but the question asks for the best standard overall.
- C
802.11n
Correct. 802.11n supports both 2.4 GHz and 5 GHz, but the 2.4 GHz band provides superior range and penetration through obstacles, making it ideal for warehouses.
- D
802.11a
Why wrong: 802.11a operates only on 5 GHz and has poor range and penetration, making it unsuitable for this environment.
Question 445 of 1,020
Which Wireless Standard Maximizes Range and Penetration Through Obstacles?
This 220-1201 practice question tests your understanding of common networking hardware. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 setting up a new wireless network for a warehouse. The warehouse has metal shelving and concrete walls. Which wireless standard should the technician choose to maximize range and penetration through obstacles?
Quick Answer
The answer is 802.11n, as it operates on the 2.4 GHz frequency band, which inherently provides superior range and penetration through obstacles compared to higher-frequency standards. This is because lower-frequency radio waves, like those at 2.4 GHz, diffract more easily around solid objects and lose less energy when passing through materials such as concrete and metal shelving, making it the best wireless standard for range and obstacle penetration in dense environments. On the CompTIA A+ Core 1 220-1201 exam, this question tests your understanding of how frequency directly impacts signal behavior, often appearing as a scenario where a technician must choose between 2.4 GHz and 5 GHz for a warehouse or old building. A common trap is assuming newer standards like 802.11ac or 802.11ax (Wi-Fi 5 or 6) are always superior, but remember that their 5 GHz operation sacrifices range for speed. For a quick memory tip, think “2.4 goes through more doors”—the lower number means longer reach through barriers.
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
✓
802.11n
802.11n (Wi-Fi 4) operates in both the 2.4 GHz and 5 GHz bands, but its key advantage for this scenario is the 2.4 GHz band, which offers longer range and better penetration through obstacles like metal shelving and concrete walls due to lower frequency and better diffraction characteristics. It also supports MIMO (Multiple Input Multiple Output) with up to four spatial streams, which can improve signal robustness in multipath environments typical of warehouses.
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.
- ✗
802.11ac
Why it's wrong here
802.11ac operates primarily on 5 GHz, which has less range and poorer penetration through obstacles like metal and concrete.
- ✗
802.11ax (Wi-Fi 6)
Why it's wrong here
Wi-Fi 6 can use both bands, but its 5 GHz band still has less range. The 2.4 GHz band is better for penetration, but the question asks for the best standard overall.
- ✓
802.11n
Why this is correct
Correct. 802.11n supports both 2.4 GHz and 5 GHz, but the 2.4 GHz band provides superior range and penetration through obstacles, making it ideal for warehouses.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
802.11a
Why it's wrong here
802.11a operates only on 5 GHz and has poor range and penetration, making it unsuitable for this environment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
It is a common misconception that newer standards (like 802.11ac or 802.11ax) always provide better range. In fact, the 2.4 GHz band's physical properties make older standards like 802.11n superior for penetration and range in obstacle-heavy environments.
Detailed technical explanation
How to think about this question
802.11n introduced frame aggregation (A-MPDU and A-MSDU) and MIMO with up to 4 spatial streams, which not only increase throughput but also improve signal reliability in multipath-rich environments like warehouses by using multiple antennas to combine reflected signals. In practice, a technician deploying 802.11n at 2.4 GHz with 40 MHz channel bonding can achieve usable coverage through several concrete walls, whereas 5 GHz signals (802.11ac/ax) would drop off significantly after just one or two walls, especially with metal shelving causing reflection and absorption.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Common Networking Hardware — This question tests Common Networking Hardware — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 802.11n — 802.11n (Wi-Fi 4) operates in both the 2.4 GHz and 5 GHz bands, but its key advantage for this scenario is the 2.4 GHz band, which offers longer range and better penetration through obstacles like metal shelving and concrete walls due to lower frequency and better diffraction characteristics. It also supports MIMO (Multiple Input Multiple Output) with up to four spatial streams, which can improve signal robustness in multipath environments typical of warehouses.
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.
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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