Certified Wireless Network Administrator - 109 Exam Prep

Explore wireless antennas used in Wi-Fi, from dipole and Yagi to parabolic and patch, and learn about MIMO, Fresnel zone, fade margin, sector antennas, polarization, and azimuth.

Learn to calculate a link budget for a wireless system using the rule of tens and threes, and master RF terms like milliwatt, dbm, dbi, rsi, vswr, and antenna gain.

learn spread spectrum technologies, covering uni and ism bands, dfs, and des, ofdm, and fhss, and how these schemes power modern wifi standards.

Explore 802.11 modulation, including BPSK, QPSK, QAM, and OFDM, and learn how each encodes bits per symbol and supports resilient Wi‑Fi communications.

Explore the data link layer concepts, including the LLC and MAC sublayers, framing, error detection, and frame transmission, then analyze 802.11 frame composition, SDU, PDU, and FCS.

Explore the 802.11 frame composition, focusing on the mac header, frame control, protocol version, and type/subtype to understand frame classification and transmission.

Examine management frames in 802.11, including beacon, probe, authentication, association, and action frames, with Wireshark demonstrations. Learn roaming, reassociation, disassociation, and dfs, tpc, and neighbor reports for fast handoffs.

Explore how 802.11 control frames govern wireless data flow, including ack, block ack, poll frames, and rts/cts with nav and sifs to prevent collisions and mitigate the hidden node problem.

Explore wifi frames, data and null frames, their payloads and fields like destination addresses, frame control, and sequence control, plus how null frames enable power management and quality of service.

Learn how the 802.11 power save mechanism conserves battery by waking on data with tbtt, tsf, and tem, plus multicast DTM and WMM power save enhancements for QoS.

Explore 802.11 channels in the 2.4 and 5 GHz bands, including non-overlapping 1, 6, 11 channels, uni bands, dfs channels, channel bonding, and mu-mimo and ofdm concepts.

Explore mimo and spatial multiplexing to boost Wi-Fi data rates, throughput, and coverage. Understand multipath, stbc, transmit beamforming, mrc, and mu-mimo concepts that enable reliable, multi-user wireless communication.

Explore how 802.11 wireless networks manage access with csma/ca, collision avoidance, and qos mechanisms like edca and hcf, including rts/cts, acks, and traffic prioritization (voice, video, best effort).

Explore how 802.11n/ac mac uses amsdu and ampdu aggregation to reduce header overhead, boost throughput, and improve efficiency, with mac layer buffers, padding, and power management.

Explore advanced Wi-Fi power management techniques, including unscheduled automatic power save delivery (u-apsd), spatial multiplexing power save (smps), and TCP power save, as devices wake for data and conserve energy.

Explore wireless client architecture within the wireless LAN framework, tracing the evolution from pcmcia cards to embedded Wi-Fi and mesh networks that self-configure and optimize coverage.

Explore the three planes of operation: management, control, and data, and their roles in configuration, monitoring, security, firmware updates, lwapp, capwap, lsm protocols, controller-ap coordination, split mac, and data transmission.

explores specialized infrastructure by examining wireless LAN mesh networks and bridges, highlighting self-healing mesh routing, multi-radio AP support, and secure point-to-point and point-to-multipoint bridges with WPA2/3 and 802.1x.

Explore 802.11 service sets, including basic and extended basic service sets. Understand independent basic service sets, personal basic service sets, and mesh service sets for QoS-enabled networks.

Explore autonomous, centralized, and distributed WLAN architectures, detailing a wireless LAN controller's roles in security, QoS, mobility, and centralized or cloud-based management, plus hybrid approaches.

Explore general wireless deployment scenarios, including WMAN, WWAN, and WPAN, with WiMAX, LTE, cellular and satellite connectivity, base stations, and short range technologies like Bluetooth and Zigbee.

Assess wireless LAN requirements by mapping indoor and outdoor coverage and capacity through a site survey, considering applications, device types, future growth, and six gigahertz.

WLAN verticals outline the design considerations for retail, hospitality, health care, sports and entertainment, education, warehouse, and remote workers to deliver reliable wireless coverage and capacity.

Explore design considerations for voice, video, and real-time location services over wifi, balancing signal strength and SNR to meet application latency and reliability requirements.

Design wireless LAN coverage to deliver high data rates and seamless roaming, ensuring -70 dBm receive strength, adequate SNR, and strategic AP placement.

Plan capacity by optimizing channel reuse and non-overlapping 2.4 and 5 GHz channels, including DFS considerations, to minimize interference. Use band steering and load balancing to improve performance.

Design for six gigahertz by leveraging wifi 6e's 1200 megahertz spectrum, afk coordination, and psc-based fast scanning to optimize indoor deployments.