N10-009 Network Implementation Practice Question
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?
⚠ Common exam trap
A common mix-up: candidates 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.
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
✓
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.
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 radio frequency energy equally in all horizontal directions, which is fundamentally inefficient and inappropriate for a 2 km point-to-point link. This broad radiation pattern means that most of the transmitted power is wasted by being sent in directions where there is no receiving antenna, leading to severe signal attenuation over distance. Furthermore, their lack of directionality makes them highly susceptible to interference from other devices, compromising link stability and throughput over a long span.
When this WOULD be correct
An omni-directional antenna would be correct when an organization needs to provide wireless coverage to multiple clients in all directions from a central location, such as a Wi-Fi access point in an open office or a hotspot in a public area.
- ✗
Yagi antenna
Why it's wrong here
Yagi antennas are directional and can provide moderate gain, making them suitable for point-to-point links over shorter to medium distances, typically up to a few hundred meters or perhaps 1 km under ideal conditions. However, for a substantial distance of 2 km, their gain is generally insufficient to establish a robust and high-throughput connection compared to a parabolic dish. While more directional than an omni, a Yagi's beamwidth is still broader than a dish, resulting in less concentrated power and higher path loss over such an extended range.
When this WOULD be correct
A Yagi antenna would be best for a point-to-multipoint link over a shorter distance (e.g., 500 m) where a directional but less focused beam is needed to cover a small sector, such as connecting a central office to multiple nearby buildings.
- ✗
Patch antenna
Why it's wrong here
Patch antennas are characterized by their relatively low gain and semi-directional radiation pattern, making them unsuitable for a 2 km point-to-point connection. While they offer some directionality, their signal concentration is insufficient to overcome the significant free space path loss encountered over such a long distance. These antennas are primarily designed for shorter-range applications, often indoors or for localized outdoor coverage, where high gain is not a primary requirement.
When this WOULD be correct
A patch antenna would be correct for a short-range (e.g., <100 m) point-to-point link within a building or between nearby buildings, or for a point-to-multipoint setup where a sector coverage pattern is needed, such as connecting multiple clients from a single access point.
- ✓
Parabolic dish antenna
Why this is correct
Parabolic dish antennas are the optimal choice for establishing a 2 km point-to-point wireless bridge due to their exceptionally high gain and extremely narrow beamwidth. This design effectively concentrates the radio frequency energy into a tightly focused beam, ensuring maximum signal strength over long distances while minimizing signal dispersion. The narrow beam also significantly reduces interference from other wireless sources, which is critical for maintaining a stable and reliable link across such a span.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓Parabolic dish antennaCorrect answer▾
Why this is correct
Parabolic dish antennas are the optimal choice for establishing a 2 km point-to-point wireless bridge due to their exceptionally high gain and extremely narrow beamwidth. This design effectively concentrates the radio frequency energy into a tightly focused beam, ensuring maximum signal strength over long distances while minimizing signal dispersion. The narrow beam also significantly reduces interference from other wireless sources, which is critical for maintaining a stable and reliable link across such a span.
✗Omni-directional antennaWrong answer — click to see why▾
Why this is wrong here
Omni-directional antennas radiate signal in all directions, which disperses power and reduces range. For a 2 km point-to-point link, they lack the necessary gain and focus, leading to weak signal and potential interference.
★ When this WOULD be the correct answer
An omni-directional antenna would be correct when an organization needs to provide wireless coverage to multiple clients in all directions from a central location, such as a Wi-Fi access point in an open office or a hotspot in a public area.
Why candidates choose this
Candidates may think omni-directional antennas are suitable for any wireless link because they are common in home/office Wi-Fi, overlooking the need for high gain and directionality in long-distance point-to-point connections.
✗Yagi antennaWrong answer — click to see why▾
Why this is wrong here
A Yagi antenna has moderate gain and directionality but is not designed for long-distance links of 2 km; its beamwidth is wider, leading to signal dispersion and lower focus compared to a parabolic dish.
★ When this WOULD be the correct answer
A Yagi antenna would be best for a point-to-multipoint link over a shorter distance (e.g., 500 m) where a directional but less focused beam is needed to cover a small sector, such as connecting a central office to multiple nearby buildings.
Why candidates choose this
Candidates may confuse Yagi antennas as highly directional due to their common use in TV reception and Wi-Fi bridging, overlooking that parabolic dishes provide superior gain and narrow beamwidth for long distances.
✗Patch antennaWrong answer — click to see why▾
Why this is wrong here
A patch antenna has a relatively wide beamwidth (typically 30-180 degrees) and lower gain, making it unsuitable for a 2 km point-to-point link where focused, high-gain directionality is required to overcome path loss.
★ When this WOULD be the correct answer
A patch antenna would be correct for a short-range (e.g., <100 m) point-to-point link within a building or between nearby buildings, or for a point-to-multipoint setup where a sector coverage pattern is needed, such as connecting multiple clients from a single access point.
Why candidates choose this
Candidates may confuse patch antennas as directional because they radiate in a hemisphere, but they lack the high gain and narrow beamwidth of a parabolic dish needed for long-distance links.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
Wireless Standards and Configuration
Key term
Organization
An Organization is a top-level container in Google Cloud that represents your company or entities and serves as the root node for all your cloud resources, policies, and access control.
Key term
Throughput
Throughput is the rate at which data is successfully transferred from one point to another over a network, typically measured in bits per second.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This N10-009 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the N10-009 exam.