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Question 1. Which part of the electromagnetic spectrum is primarily utilized by Wi-Fi devices? A) Ultraviolet B) Radio frequency C) X-ray D) Infrared Answer: B Explanation: Wi-Fi devices operate in RF (radio frequency) portions of the electromagnetic spectrum, typically at 2.4 GHz and 5 GHz bands. Question 2. What characteristic of radio waves is most directly affected by the wavelength? A) Amplitude B) Frequency C) Propagation distance D) Wavelength determines the wave’s physical length Answer: D Explanation: Wavelength is the physical length of one cycle of the wave and is inversely proportional to frequency; it directly describes the wave’s physical size. Question 3. Which RF propagation phenomenon occurs when radio waves bounce off surfaces, causing multipath effects? A) Reflection B) Refraction C) Diffraction D) Scattering Answer: A Explanation: Reflection occurs when radio waves bounce off surfaces such as walls or buildings, leading to multipath propagation. Question 4. Free Space Path Loss (FSPL) increases with which of the following? A) Decreasing distance between transmitter and receiver
B) Increasing frequency C) Increasing antenna gain D) Decreasing transmit power Answer: B Explanation: FSPL increases with higher frequency because higher frequencies experience greater attenuation over the same distance. Question 5. Which of the following best describes the Fresnel Zone in RF communication? A) The line of direct sight between antennas B) The region around the line of sight where obstacles can cause diffraction C) The area where multipath interference is minimized D) The coverage area of an omnidirectional antenna Answer: B Explanation: The Fresnel Zone is an elliptical region around the LOS path where obstacles can cause diffraction, affecting signal strength and quality. Question 6. Which unit expresses power relative to 1 milliwatt? A) dB B) dBm C) mW D) dBi Answer: C Explanation: mW (milliwatt) is a unit of power measurement relative to 1 milliwatt; dBm is a logarithmic expression of power in milliwatts. Question 7. What does EIRP stand for in RF terms? A) Effective Isotropic Radiated Power B) Equalized Isolated Radio Power C) Enhanced Interference Reduction Protocol D) Electromagnetic Interference Radio Power
Question 11. Which antenna characteristic is directly related to its ability to focus energy in a particular direction? A) Gain B) Beamwidth C) Polarization D) Wavelength Answer: A Explanation: Gain reflects how well an antenna can focus energy in a specific direction, with higher gain indicating more focused radiation. Question 12. Which type of antenna diversity involves using multiple antennas to improve signal quality and reduce fading? A) Frequency diversity B) Spatial diversity C) Polarization diversity D) Time diversity Answer: B Explanation: Spatial diversity employs multiple antennas at different locations to mitigate multipath fading and improve link reliability. Question 13. Which environmental factor most significantly impacts RF propagation indoors? A) Atmospheric humidity B) Walls and furniture C) Solar radiation D) Wind speed Answer: B Explanation: Walls, furniture, and other obstacles cause reflection, absorption, and scattering, significantly affecting indoor RF signals. Question 14. Which interference source occurs when two nearby access points operate on the same channel?
A) Co-channel interference B) Adjacent channel interference C) External interference D) Multipath interference Answer: A Explanation: Co-channel interference arises when multiple APs use the same channel, causing signal conflicts and degraded performance. Question 15. Which RF phenomenon causes rapid fluctuations in signal strength due to multiple propagation paths? A) Reflection B) Diffraction C) Multipath fading D) Absorption Answer: C Explanation: Multipath fading results from signals arriving via multiple paths, causing constructive and destructive interference that fluctuates rapidly. Question 16. In Wi-Fi standards, which amendment introduced OFDMA to improve efficiency in dense networks? A) 802.11n B) 802.11g C) 802.11ax (Wi-Fi 6) D) 802.11ac Answer: C Explanation: 802.11ax, or Wi-Fi 6, introduced OFDMA (Orthogonal Frequency Division Multiple Access) to enhance spectral efficiency in crowded environments. Question 17. Which Wi-Fi band typically offers more non-overlapping channels in the 2.4 GHz spectrum? A) 1 channel
Answer: B Explanation: 802.11 employs CSMA/CA to listen before transmitting and avoid collisions in wireless medium. Question 21. What is the purpose of a beacon frame in an 802.11 network? A) To initiate data transfer B) To synchronize and advertise network presence C) To establish authentication D) To request channel access Answer: B Explanation: Beacon frames broadcast by APs periodically advertise network parameters, synchronize clients, and facilitate discovery. Question 22. Which of the following frames is used to request permission to send data in 802. networks? A) RTS (Request to Send) B) ACK (Acknowledgment) C) Probe request D) Deauthentication Answer: A Explanation: RTS frames are sent by clients to request access to transmit data, helping avoid collisions. Question 23. Which 802.11 security method is considered most secure due to its use of SAE and 256-bit encryption? A) WEP B) WPA C) WPA D) WPA Answer: D
Explanation: WPA3 introduces SAE (Simultaneous Authentication of Equals) and uses stronger 256-bit encryption, enhancing security. Question 24. Which security protocol is deprecated due to vulnerabilities like the key reinstallation attack? A) WPA B) WPA C) WEP D) WPA Answer: C Explanation: WEP is deprecated because of fundamental vulnerabilities that make it easy to crack, such as weak initialization vectors. Question 25. In 802.1X authentication, which component acts as the authenticator? A) RADIUS server B) Supplicant C) Switch or access point D) Authentication client Answer: C Explanation: The authenticator (e.g., switch or AP) mediates communication between the supplicant and authentication server. Question 26. Which component of 802.1X handles the actual authentication process? A) Supplicant B) RADIUS server C) Authenticator D) EAP module Answer: B Explanation: The RADIUS server handles the authentication process, verifying credentials and granting network access.
Question 30. Which troubleshooting step involves analyzing RF spectrum to detect sources of interference? A) Checking DHCP server B) Using a spectrum analyzer C) Verifying SSID configurations D) Inspecting cable connections Answer: B Explanation: Spectrum analyzers visualize RF activity and interference sources, aiding in troubleshooting RF issues. Question 31. What is the purpose of a site survey before deploying a wireless network? A) To select appropriate hardware vendors B) To plan for optimal AP placement and minimize interference C) To configure security settings D) To test network speed Answer: B Explanation: A site survey assesses physical environment, interference, and coverage needs to optimize AP placement and performance. Question 32. Which of the following is a passive site survey method? A) Using a spectrum analyzer during active data transmission B) Walking through the environment with a Wi-Fi analyzer C) Running simulated coverage models D) Deploying temporary APs Answer: B Explanation: Passive surveys involve measuring existing RF conditions without transmitting data, typically through a Wi-Fi analyzer. Question 33. When planning wireless coverage, which factor influences the placement of access points to ensure seamless roaming?
A) AP's maximum transmit power B) Overlapping coverage areas C) Number of SSIDs D) Use of omnidirectional antennas only Answer: B Explanation: Overlapping coverage areas enable clients to roam seamlessly between APs without losing connectivity. Question 34. Which wireless topology allows devices to communicate directly without an access point? A) BSS B) Extended Service Set C) IBSS (ad-hoc mode) D) Mesh network Answer: C Explanation: IBSS, or ad-hoc mode, allows wireless devices to communicate directly without centralized infrastructure. Question 35. Which component manages multiple access points in a controller-based wireless network? A) Wireless LAN Controller (WLC) B) Network switch C) DHCP server D) RADIUS server Answer: A Explanation: WLCs centrally manage AP configurations, security, and client sessions in enterprise WLANs. Question 36. Which type of wireless network component is used to connect two separate LAN segments wirelessly? A) Repeater B) Bridge
Answer: B Explanation: Assigning non-overlapping channels reduces co-channel interference, improving network performance. Question 40. What is the primary function of the four-way handshake in WPA2 security? A) To establish a shared encryption key B) To authenticate the client C) To assign IP addresses D) To synchronize clocks Answer: A Explanation: The four-way handshake securely establishes a shared encryption key between client and AP for data protection. Question 41. Which frame type is used by a client to initiate association with an access point? A) Beacon B) Probe Request C) Association Request D) Authentication Answer: C Explanation: The client sends an Association Request frame to establish a connection with an AP after scanning. Question 42. Which wireless security protocol introduced WPA3 to replace WPA2? A) TKIP B) SAE (Simultaneous Authentication of Equals) C) WEP D) EAP-TLS Answer: B Explanation: WPA3 introduced SAE, a more secure handshake protocol that replaces WPA2's four-way handshake.
Question 43. Which element in an 802.1X/EAP architecture acts as the authentication server? A) Supplicant B) Authenticator C) RADIUS server D) Access point Answer: C Explanation: The RADIUS server performs the actual user authentication in 802.1X/EAP setups. Question 44. Which of the following best describes the purpose of a spectrum analyzer in wireless troubleshooting? A) To measure network throughput B) To identify RF interference sources C) To monitor IP traffic D) To configure AP settings Answer: B Explanation: Spectrum analyzers visualize RF activity and interference, helping identify sources causing signal degradation. Question 45. Which factor must be considered to ensure effective roaming between access points? A) Different SSIDs on each AP B) Overlapping coverage areas C) Unique channel for each AP D) Disabling handoff features Answer: B Explanation: Overlapping coverage areas enable smooth roaming, preventing dropped connections as clients move. Question 46. Which tool is most commonly used during a Wi-Fi site survey to assess signal strength and coverage?
B) 802.11ac C) 802.11n D) 802.11g Answer: A Explanation: Wi-Fi 6 (802.11ax) supports multi-user MIMO and 160 MHz channels, reaching theoretical speeds up to 9.6 Gbps. Question 50. Which control frame in 802.11 is used to acknowledge successful receipt of a data frame? A) RTS B) CTS C) ACK D) Probe Request Answer: C Explanation: ACK frames confirm successful receipt of data frames, ensuring reliable delivery. Question 51. What is the significance of the Network Allocation Vector (NAV) in 802.11 MAC? A) It indicates the duration of the current transmission B) It synchronizes clocks between devices C) It manages power saving modes D) It identifies the AP’s MAC address Answer: A Explanation: NAV is used to reserve the medium for a specified duration, preventing collisions during ongoing transmissions. Question 52. Which Wi-Fi security method encrypts data using AES in CCMP mode? A) WEP B) WPA C) WPA D) WPA
Answer: C Explanation: WPA2 uses AES in CCMP mode to provide strong encryption for wireless data. Question 53. Which type of antenna is most suitable for long-distance point-to-point links? A) Omnidirectional B) Yagi or parabolic dish C) Patch D) Sector Answer: B Explanation: Yagi or parabolic dish antennas are highly directional, ideal for long-distance point-to-point connections. Question 54. What is the primary purpose of a Wi-Fi repeater? A) To extend coverage by retransmitting signals B) To filter network traffic C) To authenticate users D) To encrypt data Answer: A Explanation: Repeater amplifies and retransmits Wi-Fi signals, extending coverage area. Question 55. Which is a common environmental factor that can cause signal attenuation in indoor wireless networks? A) Solar flares B) Walls and furniture C) Wind D) Temperature outside Answer: B Explanation: Walls, furniture, and other obstacles absorb and reflect RF signals, causing attenuation indoors.
A) Wireless LAN Controller (WLC) B) DHCP server C) Client device D) Bridge Answer: A Explanation: WLC centrally manages AP configurations, client sessions, and security policies in enterprise WLANs. Question 60. Which type of site survey involves measuring RF conditions after deployment to validate coverage? A) Predictive B) Passive C) Active D) Post-deployment validation Answer: D Explanation: Post-deployment validation surveys verify that the actual RF environment meets coverage and performance expectations. Question 61. Which configuration setting is critical to prevent interference from neighboring wireless networks? A) SSID broadcast B) Channel selection C) Power saving mode D) MAC filtering Answer: B Explanation: Choosing non-overlapping channels minimizes interference and improves network stability. Question 62. Which of the following is a common cause of slow Wi-Fi speeds in a congested environment? A) Excessive channel bonding
B) Co-channel interference C) High transmit power D) Use of omnidirectional antennas Answer: B Explanation: Co-channel interference causes congestion, leading to reduced throughput and slow speeds. Question 63. Which security protocol is vulnerable to the KRACK attack, leading to its deprecation? A) WPA B) WPA C) WEP D) WPA Answer: A Explanation: WPA2 is vulnerable to the KRACK attack, which exploits weaknesses in the four-way handshake. Question 64. Which of the following best describes the purpose of the four-way handshake in WPA/WPA2? A) To establish a shared encryption key B) To authenticate the client C) To assign IP addresses D) To synchronize clocks Answer: A Explanation: The four-way handshake securely establishes a shared encryption key for encrypting subsequent data. Question 65. Which frame type in 802.11 is used to establish initial network connection and authentication? A) Beacon B) Authentication
