CWAP Prep Podcast

Russell Lamb

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Study for the CWAP Wireless Networking Exam

54m ago

WLAN Medium Access (CWAP Domain 5)

Domain 5 of the CWAP-405 exam is WLAN medium access: how a station decides when it is allowed to send, and how QoS changes the odds. In this episode, a nurse on a hospital ward says her voice badge breaks up when she is listening, but not when she is talking. Same AP, strong signal, and the caller hears her fine. Only one direction of the call is broken. Physical and virtual carrier sense: CCA, the NAV, and the Duration fieldSIFS, DIFS, and AIFS, and what the gaps decideBackoff, the contention window, and what a missing ACK does and does not proveEDCA: four access categories, AIFSN, CWmin, CWmax, and TXOPThe WMM Parameter element, WMM Power Save, and admission controlThe TID in QoS Control, and why a filter on voice priority can miss the voiceEnd-to-end QoS: DSCP on the wire, user priority at the AP, TID on the airTen points to rememberThe case is a constructed lab illustration. Next episode: Domain 6, 802.11 Frame Exchanges.
55m ago

MAC Sublayer and Functions (CWAP Domain 4)

Domain 4 of the CWAP-405 exam is the MAC sublayer: frame types and formats, what a beacon carries, what a client says when it joins, aggregation, and retries. In this episode, a loading-dock handheld with a strong signal takes all morning to sync while the phone next to it finishes in minutes. The dashboard says Wi-Fi 5 and healthy. The capture says something else. Frame Control, the To DS and From DS bits, the three addresses, Retry and FCSBeacon fixed fields and elements: rates, basic rates, RSN, HT and VHTThe Association Request: what the client offers, and the element that is missingWhy TKIP and high throughput do not mix, and what a saved profile can do to a connectionA-MPDU, A-MSDU, Block Ack, and why sequence numbers run in separate counts per traffic classTen points to rememberThe case is a constructed lab illustration. Next episode: Domain 5, WLAN Medium Access.
1h ago

MAC Sublayer and Functions (CWAP Domain 4)

Domain 4 of the CWAP-405 exam is the MAC sublayer: frame types and formats, what a beacon carries, what a client says when it joins, aggregation, and retries. In this episode, a loading-dock handheld with a strong signal takes all morning to sync while the phone next to it finishes in minutes. The dashboard says Wi-Fi 5 and healthy. The capture says something else. Frame Control, the To DS and From DS bits, the three addresses, Retry and FCSBeacon fixed fields and elements: rates, basic rates, RSN, HT and VHTThe Association Request: what the client offers, and the element that is missingWhy TKIP and high throughput do not mix, and what a saved profile can do to a connectionA-MPDU, A-MSDU, Block Ack, and why sequence numbers run in separate counts per traffic classTen points to rememberThe case is a constructed lab illustration. Next episode: Domain 5, 802.11 Frame Exchanges.
2h ago

PHY Layers and Technologies (CWAP Domain 3)

Domain 3 of the CWAP-405 exam is PHY Layers and Technologies. It is 10 percent of the exam, and it decides what your capture can and can't show you. In this episode: What every PHY puts at the front of a transmission, from DSSS through EHT: preambles, training fields, and signalingWhy the legacy fields always go out at 6 Mbps, and what L-SIG spoofing isHT, VHT, HE, and EHT formats, MCS and stream counts, aggregation, resource units, and puncturingThe pseudo-header: what radiotap and PPI carry, where each value comes from, and why the frame itself has no rate fieldWhat never reaches the capture file: PHY headers, NDPs, and anything your adapter can't decodeChoosing a capture adapter for the PHY, width, and streams you need to seeHow Domain 3 shows up as exam questions, and the trapsA lecture hall where the capture says the Wi-Fi 7 tablets aren't using Wi-Fi 7Ten points to remember for the examNext episode: Domain 4, MAC Sublayer and Functions.
21h ago

Spectrum Analysis (CWAP Domain 2)

Domain 2 of the CWAP-405 exam is spectrum analysis. It is 10 percent of the exam. It's what you reach for when the retries are high, the signal is good, and the protocol capture can't tell you why. In this episode: Laptop, handheld, and AP or sensor spectrum analyzersSpan, resolution bandwidth, and why the noise floor on the screen depends on a settingThe views: real-time FFT, max hold, waterfall, density, duty cycle, detected devices, and WLAN integrationNoise floor, SNR, and SINR, with worked numbersWhy three tools report three different utilization numbersCo-channel contention and adjacent channel interferenceSignatures: DSSS, OFDM, Bluetooth, Zigbee, microwave ovens, video senders, jammers, and DECT phonesFinding a source, spotting a faulty radio, and what AP-based analysis can missA hospital case, start to finishTen points to remember for the examNext episode: Domain 3, PHY Layers and Technologies.
1d ago

Protocol Analysis (CWAP Domain 1)

Domain 1 of the CWAP-405 exam is protocol analysis. It is 15 percent of the exam, and every other domain depends on it. In this episode: The seven troubleshooting steps, in orderMonitor mode, and what your capture adapter can and can't decodeWhere to capture, and why one radio hears one channel at a timeCapture settings: buffers, triggers, slicing, capture and display filters, channel width, and dwell timeWhat the analyzer does: display filters, the decode, the Retry bit, statistics, expert mode, and decryptionOther tools: scanners, visualization, centralized monitoring, and client experience sensorsThe warehouse case, start to finishTen points to remember for the examNext episode: Domain 2, Spectrum Analysis.

6 Episodes

Study for the CWAP Wireless Networking Exam

Creator

Russell Lamb
Years Active

2026
Episodes

6
Rating

Clean
Copyright

© Russell Lamb
Show Website

CWAP Prep Podcast