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CWNP CWNA-109 Exam Syllabus Topics:

Topic	Details
Topic 1	Radio Frequency (RF) Technologies: This topic explains the basic features and behavior of RF. It also discusses applying the basic concepts of RF mathematics and measurement. Lastly, the topic covers RF signal characteristics and the functionality of RF antennas.
Topic 2	WLAN Network Security: It addresses the concepts of weak security options, security mechanisms for enterprise WLANs, and security options and tools used in wireless networks.
Topic 3	WLAN Network Architecture and Design Concepts: This topic deals with describing and implementing Power over Ethernet (PoE). Furthermore, the topic covers different wireless LAN architectures, coverage requirements, roaming considerations, and common proprietary features in wireless networks.
Topic 4	WLAN Protocols and Devices: It focuses on terminology related to the 802.11 MAC and PHY, the purpose of the three main 802.11 frame types, MAC frame format, and 802.11 channel access methods.
Topic 5	RF Validation and WLAN remediation: This topic covers RF interference, WLAN performance, the basic features of validation tools, and common wireless issues.

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CWNP Wireless Network Administrator (CWNA) Sample Questions (Q109-Q114):

NEW QUESTION # 109
Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere with each other when they transmit frames. Assuming no other APs are in the vicinity, is CCI still a possibility in this network and why?

A. Yes, because channel 11 loops around and causes CCI with channel 1.
B. No, because the APs are far enough apart that no CCI will occur.
C. Yes, because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as clients connected to the other channel 1 AP.
D. No, because CCI only occurs in the 5 GHz frequency band.

Answer: C

Explanation:
CCI is still a possibility in this network because the client devices connected to one of the channel
1 APs will transmit frames that reach the other channel 1 AP as well as clients connected to the other channel 1 AP. CCI stands for co-channel interference, which is a type of interference that occurs when two or more devices transmit on the same channel within range of each other. CCI reduces performance and capacity because it causes contention and collisions on the wireless medium, which leads to retransmissions and delays. CCI can be mitigated by increasing physical separation between devices using the same channel or by reducing transmit power levels to limit coverage area. In this scenario, three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere with each other when they transmit frames. However, this does not prevent CCI from occurring between their client devices that are connected on channel 1. For example, if a client device connected to one of the channel 1 APs sends a frame to another device on the wired network or on another wireless network (such as an Internet server or a VoIP phone), that frame will be heard by both channel 1 APs as well as any other client devices connected to either of them on channel 1. This will cause CCI because these devices will have to wait for the channel to be clear before they can transmit their own frames. The answer that CCI only occurs in the 5 GHz frequency band is incorrect; CCI can occur in any frequency band where devices use the same channel. The answer that channel 11 loops around and causes CCI with channel 1 is also incorrect; channel 11 does not loop around and it operates in a different frequency band than channel 1.

NEW QUESTION # 110
You are a small business wireless network consultant and provide WLAN services for various companies. You receive a call from one of your customers stating that their laptop computers suddenly started experiencing much slower data transfers while connected to the WLAN. This company is located in a multi-tenant office building and the WLAN was designed to support laptops, tablets and mobile phones. What could cause a sudden change in performance for the laptop computers?

A. The antennas in the laptops have been repositioned.
B. A few of your customer's users have Bluetooth enabled wireless headsets.
C. A new tenant in the building has set their AP to the same RF channel that your customer is using.
D. The sky was not as cloudy that day as it typically is and the sun also radiates electromagnetic waves.

Answer: C

NEW QUESTION # 111
What WLAN architecture uses lightweight access points that tunnel all traffic back to a centralized controller, and where does client data typically get bridged onto the wired network?

A. At the access point locally.
B. At each client device.
C. At the WLAN controller.
D. At the RADIUS server.

Answer: C

Explanation:
In a controller-based architecture using centralized data forwarding, lightweight access points tunnel client traffic back to the WLAN controller using a protocol such as CAPWAP. The controller then bridges the traffic onto the wired network. This centralized approach simplifies VLAN management and policy enforcement but can create a bottleneck at the controller in large deployments. Some controller-based architectures instead use local, or distributed, data forwarding, where the AP bridges traffic directly onto the local wired network.

NEW QUESTION # 112
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

A. OFDM modulation is used only in 5 GHz 802.11 transmissions.
B. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
C. OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
D. OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.

Answer: C

Explanation:
OFDM is a modulation method that divides the channel bandwidth into multiple subcarriers, each carrying a single data symbol. This allows for higher data rates and more robust transmissions in multipath environments. OFDM was first introduced in the 802.11a standard, which operates in the 5 GHz band and supports data rates up to 54 Mbps. Later, the 802.11g standard adopted OFDM for the 2.4 GHz band, and the 802.11n and 802.11ac standards enhanced OFDM with features such as MIMO (Multiple Input Multiple Output), channel bonding, and higher-order modulation schemes to achieve data rates up to 600 Mbps and 6.9 Gbps, respectively. These standards are collectively known as the ERP (Extended Rate PHY), HT (High Throughput), and VHT (Very High Throughput) PHYs.

NEW QUESTION # 113
Which mechanism, defined as part of 802.11h, allows an AP to detect and avoid interference with radar systems by dynamically changing channels?

A. Extended Interframe Space
B. Dynamic Frequency Selection (DFS)
C. Clear Channel Assessment (CCA)
D. Transmit Power Control (TPC)

Answer: B

Explanation:
Dynamic Frequency Selection (DFS) is a mechanism required on certain 5 GHz channels that were originally allocated to radar systems, such as weather and military radar. DFS-capable APs continuously monitor the channel for radar signatures. If radar is detected, the AP must vacate the channel and select a different one to avoid interfering with the radar system. DFS, along with Transmit Power Control (TPC), was introduced through the 802.11h amendment to allow 802.11 devices to coexist with radar systems in the 5 GHz band.

NEW QUESTION # 114
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