CWNA-107 Certified Wireless Network
Administrator Exam
Question 1. Which part of the electromagnetic spectrum is primarily used by
Wi-Fi devices operating in the 2.4 GHz band?
A) Radio waves
B) Microwaves
C) Infrared radiation
D) Ultraviolet light
Answer: B
Explanation: Wi-Fi devices in the 2.4 GHz band utilize microwaves, a subset
of radio waves, with the specific frequency range around 2.4 GHz.
Microwaves are suitable for wireless communication due to their ability to
penetrate obstacles and provide reasonable data rates.
Question 2. What is the primary effect of increased antenna gain on a
wireless signal?
A) Broader coverage area
B) Increased signal strength in a specific direction
C) Reduced interference
D) Decreased data rates
Answer: B
, CWNA-107 Certified Wireless Network
Administrator Exam
Explanation: Higher antenna gain concentrates the radio energy in a
particular direction, increasing the signal strength and range in that direction,
but typically reducing coverage in other directions.
Question 3. Which RF characteristic describes the phase difference between
two signals of the same frequency?
A) Amplitude
B) Wavelength
C) Phase
D) Polarization
Answer: C
Explanation: Phase refers to the position of a point in time on a waveform
cycle, representing the phase difference between signals of the same
frequency, which affects constructive and destructive interference.
Question 4. Which propagation phenomenon involves the bending of radio
waves around obstacles?
A) Reflection
B) Diffraction
, CWNA-107 Certified Wireless Network
Administrator Exam
C) Absorption
D) Scattering
Answer: B
Explanation: Diffraction is the bending and spreading of waves around
obstacles, allowing signals to reach areas not in direct line of sight, crucial for
radio communication in obstructed environments.
Question 5. An omnidirectional antenna primarily radiates RF energy in
which pattern?
A) Focused beam
B) Circular pattern around the antenna
C) Sectorial pattern
D) Horizontal plane only
Answer: B
Explanation: Omnidirectional antennas radiate RF energy uniformly in all
horizontal directions, creating a circular coverage pattern ideal for general
coverage areas.
, CWNA-107 Certified Wireless Network
Administrator Exam
Question 6. What is the typical unit of measurement used to express antenna
gain relative to an isotropic radiator?
A) dB
B) dBm
C) dBi
D) dBd
Answer: C
Explanation: Antenna gain is expressed in decibels relative to an isotropic
radiator (dBi), indicating how much the antenna amplifies the signal
compared to an ideal isotropic source.
Question 7. Which RF impairment results from overlapping channels that
cause interference?
A) Co-channel interference
B) Adjacent channel interference
C) Signal attenuation
D) Multipath fading
Answer: B
Explanation: Adjacent channel interference occurs when two nearby
Administrator Exam
Question 1. Which part of the electromagnetic spectrum is primarily used by
Wi-Fi devices operating in the 2.4 GHz band?
A) Radio waves
B) Microwaves
C) Infrared radiation
D) Ultraviolet light
Answer: B
Explanation: Wi-Fi devices in the 2.4 GHz band utilize microwaves, a subset
of radio waves, with the specific frequency range around 2.4 GHz.
Microwaves are suitable for wireless communication due to their ability to
penetrate obstacles and provide reasonable data rates.
Question 2. What is the primary effect of increased antenna gain on a
wireless signal?
A) Broader coverage area
B) Increased signal strength in a specific direction
C) Reduced interference
D) Decreased data rates
Answer: B
, CWNA-107 Certified Wireless Network
Administrator Exam
Explanation: Higher antenna gain concentrates the radio energy in a
particular direction, increasing the signal strength and range in that direction,
but typically reducing coverage in other directions.
Question 3. Which RF characteristic describes the phase difference between
two signals of the same frequency?
A) Amplitude
B) Wavelength
C) Phase
D) Polarization
Answer: C
Explanation: Phase refers to the position of a point in time on a waveform
cycle, representing the phase difference between signals of the same
frequency, which affects constructive and destructive interference.
Question 4. Which propagation phenomenon involves the bending of radio
waves around obstacles?
A) Reflection
B) Diffraction
, CWNA-107 Certified Wireless Network
Administrator Exam
C) Absorption
D) Scattering
Answer: B
Explanation: Diffraction is the bending and spreading of waves around
obstacles, allowing signals to reach areas not in direct line of sight, crucial for
radio communication in obstructed environments.
Question 5. An omnidirectional antenna primarily radiates RF energy in
which pattern?
A) Focused beam
B) Circular pattern around the antenna
C) Sectorial pattern
D) Horizontal plane only
Answer: B
Explanation: Omnidirectional antennas radiate RF energy uniformly in all
horizontal directions, creating a circular coverage pattern ideal for general
coverage areas.
, CWNA-107 Certified Wireless Network
Administrator Exam
Question 6. What is the typical unit of measurement used to express antenna
gain relative to an isotropic radiator?
A) dB
B) dBm
C) dBi
D) dBd
Answer: C
Explanation: Antenna gain is expressed in decibels relative to an isotropic
radiator (dBi), indicating how much the antenna amplifies the signal
compared to an ideal isotropic source.
Question 7. Which RF impairment results from overlapping channels that
cause interference?
A) Co-channel interference
B) Adjacent channel interference
C) Signal attenuation
D) Multipath fading
Answer: B
Explanation: Adjacent channel interference occurs when two nearby
