Get CWNP CWNA-109 Exam Practice Questions - Real and Updated

Answer : A

Refraction is the bending of an RF signal as it passes through a medium with a different density than free space. This can cause the signal to change its direction and speed, which can affect the accuracy and reliability of wireless communication.Refraction is influenced by factors such as temperature, humidity, and atmospheric pressure12.Reference:CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 72;CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 67.

Answer : C

It is a channel that may require DFS when used is an important fact that should be considered about channel 128. Channel 128 is a 5 GHz frequency band 20 MHz channel that has a center frequency of 5.64 GHz. Channel 128 is one of the channels that are subject to DFS (Dynamic Frequency Selection) rules, which require Wi-Fi devices to monitor and avoid using channels that are occupied by radar systems or other primary users. DFS is a feature that is defined in the IEEE 802.11h amendment and is mandated by some regulatory bodies, such as the FCC and the ETSI, to protect the licensed users of the 5 GHz band from interference by unlicensed Wi-Fi devices. DFS works by using a mechanism called channel availability check (CAC), which requires Wi-Fi devices to scan a channel for a certain period of time before using it. If a radar signal is detected during the CAC or while using the channel, the Wi-Fi devices must switch to another channel that is free from radar interference.

When configuring an access point to use channel 128, it is important to consider the implications of DFS rules, such as:

The access point must support DFS and comply with the local regulations and standards that apply to DFS channels.

The access point may experience delays or interruptions in its operation due to CAC or channel switching.

The access point may have limited channel selection or availability due to radar interference or other Wi-Fi devices using DFS channels.

The access point may have compatibility or interoperability issues with some client devices that do not support DFS or use different DFS parameters.

The access point may have performance or quality issues due to co-channel or adjacent-channel interference from other Wi-Fi devices using non-DFS channels.

Therefore, it is advisable to use channel 128 only when necessary and after performing a thorough site survey and spectrum analysis to determine the best channel for the access point.Reference:1, Chapter 3, page 117;2, Section 3.2

Answer : D

The device in the bridge implementation that acts as the 802.1X Authenticator is theroot bridge. The root bridge is the bridge that connects to the wired network and acts as the central point for all other bridges in the point-to-multipoint topology. The root bridge authenticates the non-root bridges using 802.1X/EAP and forwards their authentication requests to the RADIUS server. The non-root bridges act as the 802.1X Supplicants and use EAP methods such as EAP-TLS or EAP-PEAP to authenticate with the root bridge.Reference:[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 459; [Cisco Aironet Wireless Bridges FAQ], question 29.

Answer : B

The common spectrum analyzer view that you should use for this analysis is theWaterfall/Spectrogramview. The Waterfall/Spectrogram view shows the signal from the interfering device over time on a three-dimensional graph. The x-axis represents frequency, the y-axis represents time, and the z-axis represents amplitude or power. The color of each pixel indicates the signal strength at a given frequency and time. The Waterfall/Spectrogram view can help you identify the characteristics of the interference source, such as its frequency range, duty cycle, modulation type, and pattern.Reference:[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 524; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 494.

Answer : A

The WLAN feature that would allow the network administrator to control the network resources that can be accessed by each employee based on their department isRole-Based Access Control (RBAC). RBAC is a method of assigning different permissions and policies to users or groups based on their roles in the organization. RBAC can be implemented by usingVLANs,ACLs, orfirewallsto restrict access to certain network segments or resources. RBAC can also be integrated with802.1X/EAPauthentication to dynamically assign roles and VLANs to users based on their credentials.Reference:[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 403; [Role-Based Access Control (RBAC) in Wireless Networks], page 1.