CWNA Case Studies & Practical Application 4

Question 1

A network engineer is asked to design a WLAN for a multi-floor office building with 500 employees. The design requires seamless roaming with centralized policy. Which architecture is MOST appropriate?

Accepted Answer

Controller-based (centralized) WLAN architecture with a wireless LAN controller (WLC)

Answer

A centralized WLAN controller enables consistent policy enforcement, seamless roaming, and centralized management across all APs in the building.

Question 2

After a WLAN upgrade to 802.11ac, a VoIP application team reports increased jitter on wireless calls. QoS was not reconfigured during the upgrade. What should be implemented?

Accepted Answer

Implement WMM (Wi-Fi Multimedia) with DSCP-to-UP mapping for voice traffic

Answer

WMM prioritizes voice traffic using the AC_VO access category, and DSCP-to-WMM mapping ensures upstream markings are honored by the AP.

Question 3

A security audit reveals that an employee's laptop is sharing an SSID using Windows hotspot functionality, allowing other employees to bypass NAC controls. What type of device is this classified as?

Accepted Answer

Soft rogue AP (software-based rogue AP)

Answer

A software-based hotspot running on an employee laptop is classified as a soft rogue AP because it creates an unauthorized access point on the corporate network.

Question 4

A WLAN deployment in a healthcare facility must comply with HIPAA. Patient data traverses the wireless network. Which encryption standard is REQUIRED at a minimum?

Accepted Answer

WPA2 with AES-CCMP (or stronger) to protect PHI in transit

Answer

HIPAA requires strong encryption for PHI in transit; WPA2-AES (CCMP) is the minimum accepted standard for wireless protection of protected health information.

Question 5

A company is troubleshooting poor throughput on a 5 GHz 802.11ac network. A spectrum analyzer shows the channel is clear, but clients report slow speeds. A packet capture reveals many retransmissions. What is the MOST likely cause?

Accepted Answer

Clients are at the edge of coverage with marginal SNR, causing high error rates

Answer

Marginal SNR causes high frame error rates and retransmissions even when no external interference is present, indicating insufficient signal strength at client locations.

CWNA - Wireless Network Administrator Practice Test

CWNA - Wireless Network Administrator Practice Test

CWNA Case Studies & Practical Application 4