CWNA 109 Certified Wireless Network Admin Practice Exam Qs

Master Wireless Networking: RF Technologies, WLAN Standards & Troubleshooting

This comprehensive course delves into the fundamentals of wireless networking, equipping you with the knowledge and skills to design, deploy, secure, and troubleshoot modern WLANs. You'll gain a deep understanding of radio frequency (RF) principles, Wi-Fi standards, and practical troubleshooting techniques.

Radio Frequency (RF) Fundamentals

Explore the core concepts of RF communication, including:

• Basic RF Characteristics: Understand wavelength, frequency, amplitude, phase, and sine waves.
• RF Propagation: Learn about reflection, refraction, diffraction, and scattering of RF signals.
• Multipath & Interference: Analyze multipath effects and identify common sources of RF interference.
• Signal Strength & Quality: Master metrics like gain and loss, amplification, attenuation, noise floor, SNR, and RSSI.
• Power Measurements: Convert between Watt and milliwatt, and understand dB, dBm, and dBi.
• VSWR & Return Loss: Analyze Voltage Standing Wave Ratio (VSWR) and Return Loss for optimal signal transmission.
• Free Space Path Loss (FSPL): Calculate signal attenuation over distance.
• Antenna Basics: Identify RF signal characteristics as they relate to antennas.
• Line of Sight & Fresnel Zone: Understand the importance of physical line of sight and Fresnel zone clearance.
• Antenna Types: Explore beamwidths, passive gain, polarization, and different antenna diversity types (e.g., Omni-directional, Semi-directional, Highly directional).
• Antenna Orientation: Learn to read azimuth and elevation charts for effective antenna placement.
• RF Cables & Connectors: Understand the role of RF cables and connectors and the importance of lightning arrestors and grounding.

Wi-Fi (WLAN) Standards & Protocols

Dive into the world of Wi-Fi, covering:

• WLAN Regulations & Standards: Learn about key organizations like the IEEE Wi-Fi Alliance and IETF, and regulatory domains.
• 802.11 Evolution: Trace the development of Wi-Fi standards, including DSSS (802.11b), HR-DSSS (802.11b), OFDM (802.11a), ERP (802.11g), Wi-Fi 4 (HT - 802.11n), Wi-Fi 5 (VHT - 802.11ac), and Wi-Fi 6 (HE - 802.11ax).
• Spread Spectrum & Modulation: Understand spread spectrum technologies, modulation, and coding schemes (DSSS, OFDM, OFDMA).
• 802.11 WLAN Concepts: Explore primary channels, adjacent overlapping and non-overlapping channels, throughput vs. data rate, and bandwidth.
• OSI Model & 802.11: Understand how the OSI model relates to the 802.11-2016 standard.
• Regulatory Compliance: Comply with regulatory domain requirements including frequency bands, available channels, regulatory power constraints, and Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC).
• Wireless Network Architectures: Learn about Wireless LAN (WLAN) – BSS and ESS, wireless bridging, wireless Ad-Hoc (IBSS), and wireless mesh.
• 802.11 MAC & PHY: Understand the roles of MSDU, MPDU, PSDU, and PPDU, PHY preamble and header, and the MAC frame format.
• MAC Frame Types: Identify and explain Management, Control, and Data frames.
• WLAN Connection Process: Master scanning (active and passive), authentication (Open System, Shared Key, 802.1X/EAP, Pre-Shared Key), BSS selection, and connecting to hidden SSIDs.
• Channel Access Methods: Understand DCF, EDCA, RTS/CTS, and interframe spaces (SIFS, DIFS, EIFS, AIFS).
• Roaming & Power Saving: Learn about power save modes and frame buffering.