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220-1201 Practice Question: A technician is setting up a new wireless network…
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?
⚠ Common exam trap
It is a common misconception that newer standards (like 802.11ac) always provide better range. While 802.11ac primarily uses the 5 GHz band which has worse penetration, 802.11ax (Wi-Fi 6) can operate in the 2.4 GHz band and offers superior performance and potentially better effective range than 802.11n due to its advanced signal processing and efficiency improvements.
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
✓
802.11ax (Wi-Fi 6)
802.11ax (Wi-Fi 6) operates in both the 2.4 GHz and 5 GHz bands. For maximizing range and penetration through obstacles like metal shelving and concrete walls, the 2.4 GHz band is crucial due to its lower frequency and better diffraction characteristics. While 802.11n also uses 2.4 GHz, 802.11ax offers significant advancements such as OFDMA, improved MU-MIMO, and more efficient modulation schemes (e.g., 1024-QAM). These technologies lead to a more robust and efficient signal, which can provide better effective range and reliability in challenging environments compared to 802.11n, even when both are operating in the 2.4 GHz band.
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, also known as Wi-Fi 5, primarily utilizes the 5 GHz frequency band. While offering higher theoretical throughput, this band is inherently more susceptible to signal attenuation over distance and struggles significantly with penetration through common building materials such as concrete, metal, and even drywall. This characteristic makes 802.11ac a poor choice for environments requiring extensive coverage and obstacle penetration, like a large warehouse.
- ✓
802.11ax (Wi-Fi 6)
Why this is correct
802.11ax, or Wi-Fi 6, is a dual-band standard supporting both 2.4 GHz and 5 GHz frequencies, offering significant improvements in efficiency and capacity. However, its primary advantages are realized in dense client environments, and while its 2.4 GHz operation provides better penetration than 5 GHz, the standard itself is often overkill and not specifically optimized for maximum range and obstacle penetration as its paramount feature. For a scenario prioritizing raw range and penetration over high-density client management or peak throughput, older standards can be more effective and cost-efficient.
- ✗
802.11n
Why it's wrong here
802.11n, known as Wi-Fi 4, is a dual-band standard capable of operating on both 2.4 GHz and 5 GHz frequencies. Crucially, its 2.4 GHz operation offers significantly better signal propagation and penetration through walls and other obstacles compared to 5 GHz bands. This characteristic makes 802.11n an excellent choice for environments like warehouses where long-range coverage and reliable signal penetration through various materials are paramount, balancing performance with robust connectivity.
- ✗
802.11a
Why it's wrong here
802.11a is an older wireless standard that exclusively operates within the 5 GHz frequency band. Due to the inherent physical properties of 5 GHz signals, 802.11a suffers from limited range and notably poor penetration capabilities through common building materials. This makes it highly impractical for any environment requiring extensive coverage or reliable connectivity through obstacles, rendering it entirely unsuitable for a new wireless network setup in a challenging physical space.
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Key term
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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