CWNA Wireless Network Administrator MCQ 4

Question 1

Which 802.11 power-save mechanism allows the AP to buffer frames and notify sleeping clients via the Traffic Indication Map (TIM)?

Accepted Answer

Legacy Power Save Mode (PSM)

Answer

Legacy PSM has clients sleep between beacon intervals; the AP buffers their frames and sets bits in the TIM element of beacons to wake the relevant clients.

Question 2

A wireless engineer is performing a passive site survey. What is the primary activity during this phase?

Accepted Answer

Walking the area and capturing RF signals without connecting to an AP

Answer

A passive survey involves listening to the RF environment with a scanning adapter, capturing signal levels and interference without associating to any network.

Question 3

What distinguishes a controller-based WLAN architecture from an autonomous AP deployment?

Accepted Answer

Centralized management and data forwarding through a WLAN controller

Answer

In controller-based architectures, lightweight APs tunnel traffic (often via CAPWAP) to a central controller that handles management, policy, and often data forwarding.

Question 4

What is the role of CAPWAP in a split-MAC WLAN architecture?

Accepted Answer

Tunnels control and data traffic between lightweight APs and the WLC

Answer

CAPWAP (Control And Provisioning of Wireless Access Points) is the standard protocol that encapsulates and tunnels both control-plane and data-plane traffic between a lightweight AP and its controller.

Question 5

Which metric describes the ratio of correctly received bits to total transmitted bits and is used to measure wireless link quality?

Accepted Answer

Bit Error Rate (BER)

Answer

BER measures the proportion of bit errors in a transmission and is a direct indicator of link quality; a higher BER typically corresponds to a weaker or noisier signal.

CWNA - Wireless Network Administrator Practice Test

CWNA - Wireless Network Administrator Practice Test

CWNA Wireless Network Administrator MCQ 4