CWEng study materials
CWEng study resources

CWEng case studies

CWEng · Put your knowledge to work in context.

CWEng (Certified Wireless Engineer) is presented here as a vendor-neutral, engineering-level WLAN credential aimed at professionals who design, validate, secure, and troubleshoot enterprise wireless networks rather than simply administer them. Candidates typically arrive with several years of hands-on Wi-Fi operations experience and often already hold an entry-level or professional wireless certification; the intended audience is the engineer who owns RF design decisions, security architecture, and post-deployment performance analysis. The subject matter on this study page is organized into five areas - WLAN RF fundamentals and propagation, design and site survey, security architecture, analysis/troubleshooting/optimization, and protocols, standards, and operations - split evenly across the question set. Preparation should combine a current wireless standards reference (802.11 PHY/MAC behavior, security handshakes, roaming and QoS mechanisms) with practical spectrum-analysis and protocol-capture work on real infrastructure, because engineering-level items tend to test judgment in ambiguous, real-world scenarios rather than recall. The CWEng case studies are 5 cases and about 3,422 words.

1

The Corner That Does Not Match the Prediction

A three-story office runs 5 GHz-only APs with radios set to 17 dBm into 6 dBi omnidirectional antennas, fed by 3 m of LMR-400 (0.22 dB/m at 5 GHz) plus 1.5 dB of connector loss. The regulatory EIRP ceiling for the band is 30 dBm.

746 words, about 4 min
2

Keynote Night in the Auditorium

A 400-seat auditorium hosts a 1,200-device keynote. Six 4x4 APs are ceiling-mounted, set to 40 MHz on 5 GHz and 20 MHz on 2.4 GHz using channels 1/6/11.

654 words, about 3 min
3

Three SSIDs, One VLAN

A hospital runs three SSIDs: clinical devices on WPA2-PSK with one shared key, staff on PEAP-MSCHAPv2, and guest open with a captive portal. All three bridge to the same VLAN.

668 words, about 3 min
4

One-Way Audio and a Ping-Pong Handset

An office runs VoWiFi on 200 handsets. Users report one-way audio and calls dropping when walking between the east and west wings.

636 words, about 3 min
5

The Firmware Window and the DFS Stores

A 300-AP retail chain runs a controller HA pair. 802.11r is enabled globally on every SSID, including guest and IoT.

718 words, about 4 min