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.
220-1101 Common Networking Hardware Practice Question
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?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
802.11n
This question tests knowledge of wireless standards and their characteristics. 2.4 GHz signals (like 802.11n) have better range and penetration through obstacles than 5 GHz signals, making them ideal for environments with many barriers.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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
Standard ACLs match source addresses.
✗
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: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 220-1201 ACL questions on filtering logic and placement.
Common Networking Hardware — This question tests Common Networking Hardware — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: 802.11n — This question tests knowledge of wireless standards and their characteristics. 2.4 GHz signals (like 802.11n) have better range and penetration through obstacles than 5 GHz signals, making them ideal for environments with many barriers.
What should I do if I get this 220-1201 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 220-1201 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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