CWNP Updated CWDP-305 Exam Questions and Answers by veronica

Target Wake Time (TWT) is a power-saving feature introduced in 802.11ax (Wi-Fi 6) that allows devices to negotiate specific times to wake up and communicate, reducing the need for constant listening and thereby conserving battery life. This feature is particularly beneficial for IoT devices and other battery-powered clients.

In the 5 GHz band, all Wi-Fi traffic (802.11a/n/ac/ax) uses OFDM or OFDMA modulation. If multiple APs use overlapping or identical channels, this results in Co-Channel Interference (CCI). Legacy technologies like HR/DSSS and ERP operate in 2.4 GHz and do not contribute to CCI in 5 GHz.

From CWDP-305:

“CCI occurs when multiple devices share the same channel. In 5 GHz, all compliant Wi-Fi traffic uses OFDM-based PHYs, so other nearby OFDM networks are a primary source of CCI.”

— Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design ValidationandTroubleshooting

Comprehensive and Detailed Explanation:

In a Point-to-Multipoint (PtMP) setup where one building serves as the central hub (root bridge) connecting to multiple other buildings arranged in a square, a100° sector antennais ideal. This type of antenna provides a wide coverage area, allowing it to effectively communicate with all the other buildings positioned around it. Sector antennas focus the RF energy in a specific direction, offering better performance and reduced interference compared to omni-directional antennas in such scenarios.

Comprehensive and Detailed Explanation:

The current WLAN setup with only two APs supporting over 300 client devices is insufficient and leads to performance degradation. Simply adding more APs without a proper design can cause co-channel interference and other issues. Upgrading Ethernet connections or increasing AP power does not address the core problem of inadequate design for high-density environments. The appropriate action is to redesign the WLAN specifically for the auditorium, considering factors such as client density, application requirements, and RF environment to ensure reliable and efficient Wi-Fi performance.