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Question 1. Which of the following best describes the primary purpose of RF wavelength in wireless communication? A) Determines the signal's amplitude B) Defines the physical length of the wave C) Controls the modulation scheme D) Sets the antenna gain Answer: B Explanation: RF wavelength is the physical length of the wave, which influences antenna size and propagation characteristics. It is inversely proportional to frequency and crucial for antenna design. Question 2. Reflection of RF signals primarily causes: A) Increased signal strength B) Signal attenuation and multipath C) Improved coverage D) Reduced interference Answer: B
Explanation: Reflection causes RF signals to bounce off surfaces, leading to multipath propagation and potential signal interference, which can degrade performance. Question 3. Which RF attribute is most directly affected by antenna gain? A) Wavelength B) Signal attenuation C) Effective radiated power D) Noise floor Answer: C Explanation: Antenna gain increases the effective radiated power in a specific direction, improving signal strength and coverage in that direction. Question 4. The decibel (dB) is used to express: A) Absolute power levels B) Power ratios and gains C) Frequency modulation
C) Omni-directional D) Parabolic dish Answer: C Explanation: Omni-directional antennas radiate RF energy equally in all horizontal directions, ideal for broad area coverage. Question 7. The Fresnel zone is important because: A) It determines the antenna's polarization B) It affects signal reflection and diffraction C) It controls the bandwidth D) It defines the modulation scheme Answer: B Explanation: The Fresnel zone is the area around the line of sight that must be free of obstructions to minimize signal degradation due to reflection and diffraction. Question 8. Spread spectrum technologies like DSSS and OFDM are used primarily to:
A) Reduce interference and improve security B) Increase antenna gain C) Simplify hardware design D) Decrease bandwidth consumption Answer: A Explanation: Spread spectrum techniques help mitigate interference, enhance security, and improve robustness of wireless signals. Question 9. Which IEEE 802.11 amendment introduced Wi-Fi 6? A) 802.11ax B) 802.11ac C) 802.11n D) 802.11ad Answer: A Explanation: IEEE 802.11ax, also known as Wi-Fi 6, was introduced to improve throughput, efficiency, and performance in dense environments.
Explanation: Management frames facilitate network discovery, authentication, and association, establishing initial communication between devices. Question 12. In passive scanning, a station: A) Sends probe requests to locate networks B) Listens for beacon frames from access points C) Sends authentication frames D) Initiates association requests Answer: B Explanation: Passive scanning involves listening for beacon frames broadcast periodically by access points to discover available networks. Question 13. Which access method allows multiple stations to transmit simultaneously using different priority levels? A) DCF B) EDCA C) RTS/CTS
D) NAV
Answer: B Explanation: EDCA (Enhanced Distributed Channel Access) provides QoS by allowing different traffic classes to transmit with different priorities. Question 14. In 802.11 MAC operations, roaming allows: A) Devices to switch between different APs seamlessly B) Devices to connect to hidden SSIDs C) Preventing interference in dense networks D) Increasing transmission power dynamically Answer: A Explanation: Roaming enables wireless clients to move between multiple access points within the same network without disconnecting. Question 15. Power over Ethernet (PoE) supplies power to network devices by: A) Using separate power cables
Question 17. Which is an advantage of dynamic channel management in WLANs? A) Static interference mitigation B) Reduced need for security C) Improved interference avoidance and throughput D) Decreased network flexibility Answer: C Explanation: Dynamic channel management optimizes channel use by avoiding interference, thereby improving overall network performance. Question 18. WPA2-Enterprise differs from WPA2-Personal primarily because it: A) Uses pre-shared keys B) Employs 802.1X authentication with RADIUS servers C) Supports only open networks D) Does not provide encryption Answer: B
Explanation: WPA2-Enterprise uses 802.1X authentication via RADIUS servers, providing enterprise-level security. Question 19. WPA3 enhances security over WPA2 by: A) Eliminating the need for passwords B) Using SAE for better password protection C) Removing encryption D) Disabling open networks Answer: B Explanation: WPA3 introduces SAE (Simultaneous Authentication of Equals), which improves password-based authentication security. Question 20. Rogue access points are best detected by: A) Signal strength analysis B) Wireless Intrusion Prevention Systems (WIPS) C) MAC filtering D) SSID hiding
C) MAC address D) IP address Answer: B Explanation: Signal-to-Noise Ratio (SNR) indicates the quality of the wireless link; low SNR often points to interference or poor signal quality. Question 23. Troubleshooting a wireless connectivity issue often begins with checking: A) DHCP server status B) Signal strength and interference C) Physical cable connections D) Ethernet switch configurations Answer: B Explanation: Initial troubleshooting typically assesses RF conditions such as signal strength and interference before examining higher-layer issues.
Question 24. Which of the following is a common cause of degraded wireless performance related to network services? A) Misconfigured DHCP server B) Excessive antenna gain C) Proper VLAN segmentation D) Correct channel selection Answer: A Explanation: DHCP misconfigurations can prevent clients from obtaining IP addresses, leading to connectivity issues. Question 25. When designing a wireless network for a large office, which of the following is a key consideration? A) Only using 2.4 GHz band B) Adequate placement of access points for coverage and capacity C) Avoiding VLAN segmentation D) Disabling security to improve performance Answer: B
D) SSID hiding Answer: B Explanation: OWE provides encryption for open networks, improving security without requiring passwords. Question 28. Which 802.11 amendment adds support for operation in the 6 GHz band? A) 802.11ax B) 802.11ad C) 802.11ax D) 802.11ax (Wi-Fi 6E) Answer: D Explanation: Wi-Fi 6E (802.11ax in the 6 GHz band) extends Wi- Fi 6 capabilities into the 6 GHz spectrum. Question 29. The primary purpose of a BSS in WLAN architecture is to: A) Connect multiple access points in a mesh
B) Provide a basic network segment with a single access point C) Allow direct device-to-device communication D) Manage wired network traffic Answer: B Explanation: A BSS (Basic Service Set) is a fundamental WLAN component consisting of a single access point and associated stations. Question 30. Which 802.11 frame type is responsible for managing connection and network maintenance? A) Data B) Control C) Management D) Beacon Answer: C Explanation: Management frames handle connection setup, maintenance, and management tasks like authentication and association.
Explanation: The Network Allocation Vector (NAV) indicates the duration the medium is reserved, enabling virtual carrier sensing. Question 33. In MAC frame formatting, the PSDU contains: A) Physical layer preamble B) MAC header C) Management information D) MAC Service Data Unit (MSDU) Answer: D Explanation: The PSDU (Physical Layer Service Data Unit) carries the MSDU, which is the actual data payload. Question 34. Which feature allows a WLAN to prioritize voice and video traffic over data? A) Airtime Fairness B) Band Steering C) QoS (Quality of Service)
D) Power Save Mode Answer: C Explanation: QoS ensures that time-sensitive traffic like voice and video is given higher priority for transmission. Question 35. The main benefit of 802.11ax (Wi-Fi 6) over previous standards is: A) Use of only 2.4 GHz band B) Higher data rates and better performance in congested environments C) Elimination of security features D) Reduced coverage area Answer: B Explanation: Wi-Fi 6 offers higher throughput, improved efficiency, and better performance in crowded environments. Question 36. Which of the following is a key consideration when deploying PoE devices? A) Power source location
