The answer is a parabolic dish antenna. This antenna type is best suited for a 2 km point-to-point wireless link because its curved, dish-shaped reflector focuses radio waves into a very narrow beam, producing extremely high gain and long-distance signal strength. For a point-to-point wireless antenna long-distance connection, this narrow beamwidth is critical—it concentrates energy directly at the far building while rejecting interference from the sides, making it ideal for outdoor links where precise alignment is possible. On the CompTIA Network+ N10-009 exam, this question tests your understanding of antenna characteristics for wireless topologies; a common trap is choosing a Yagi antenna, which also has directionality but lower gain and a wider beam, making it better for shorter distances like 1 km. Remember the memory tip: “Dish for distance, Yagi for yards”—if the link is measured in kilometers, think parabolic dish.
N10-009 Network Implementation Practice Question
This N10-009 practice question tests your understanding of network implementation. 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.
An organization needs to connect two buildings that are 2 km apart with a point-to-point wireless link. Which antenna type is BEST suited for this long-distance directional connection?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Parabolic dish antenna
A parabolic dish antenna is the best choice for a 2 km point-to-point wireless link because it provides a very narrow beamwidth and high gain, focusing the signal in a specific direction to maximize distance and minimize interference. This makes it ideal for long-distance, high-throughput links where precise alignment is possible.
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.
✗
Omni-directional antenna
Why it's wrong here
Omni-directional antennas radiate in all directions, which is inefficient for point-to-point links and causes signal dispersion.
✗
Yagi antenna
Why it's wrong here
Yagi antennas are directional and can be used for moderate distances, but parabolic dishes offer higher gain for links of 2 km or more.
✗
Patch antenna
Why it's wrong here
Patch antennas are semi-directional and typically used for short-range indoor applications.
✓
Parabolic dish antenna
Why this is correct
Parabolic dish antennas provide very high gain and narrow beamwidth, making them ideal for long-distance point-to-point wireless bridges.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'directional' with 'high gain,' assuming a Yagi or patch antenna is sufficient for long distances, but the parabolic dish's superior focus and gain are critical for maintaining signal integrity over 2 km.
Detailed technical explanation
How to think about this question
Parabolic dish antennas achieve high gain (often 20-30 dBi or more) by using a curved reflector to focus radio waves into a narrow beam, typically with a beamwidth of less than 10 degrees. This design allows for longer link distances at higher frequencies (e.g., 5 GHz or 60 GHz) while reducing multipath interference, but requires precise alignment and is sensitive to wind or physical movement. In real-world deployments, such links often use licensed frequencies (e.g., 11 GHz) to avoid interference and achieve multi-gigabit throughput.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Parabolic dish antenna — A parabolic dish antenna is the best choice for a 2 km point-to-point wireless link because it provides a very narrow beamwidth and high gain, focusing the signal in a specific direction to maximize distance and minimize interference. This makes it ideal for long-distance, high-throughput links where precise alignment is possible.
What should I do if I get this N10-009 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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