Home » CompTIA » JK0-019 » Which of the following is the MOST likely cause of the issue?
The network administrator installed a new dipole antenna that extends 100 feet (30.48 meters) from the existing AP. All components are correct, functional, and installed properly. However, during validation, there is a very weak signal coming from the antenna.
Which of the following is the MOST likely cause of the issue?
A. The installation exceeds the link limitations
B. The antenna is mounted for vertical polarization
C. The dBi output of the antenna is too low
D. The radio is too powerful for the installation
Correct Answer: A
Explanation/Reference:
Explanation: Unlike isotropic antennas, dipole antennas are real antennas. Dipole antennas have a different radiation pattern compared to isotropic antennas. The dipole radiation pattern is 360 degrees in the horizontal plane and 75 degrees in the vertical plane (assuming the dipole antenna is standing vertically) and resembles a donut in shape. Because the beam is "slightly" concentrated, dipole antennas have a gain over isotropic antennas of 2.14 dB in the horizontal plane. Dipole antennas are said to have a gain of 2.14 dBi (in comparison to an isotropic antenna).
