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CWNP CWNA-109 Exam Syllabus Topics:

TopicDetails
Topic 1
  • RF Validation and WLAN remediation: This topic covers RF interference, WLAN performance, the basic features of validation tools, and common wireless issues.
Topic 2
  • 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 3
  • WLAN Regulations and Standards: The topic discusses the roles of WLAN and networking industry organizations. It also addresses the concepts of various Physical Layer (PHY) solutions, spread spectrum technologies, and 802.11 WLAN functional concepts.

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CWNP Wireless Network Administrator (CWNA) Sample Questions (Q108-Q113):

NEW QUESTION # 108
When considering data rates available in HT and VHT PHY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?

Answer: A

Explanation:
The guard interval is a short period of time inserted between the symbols of an OFDM signal to prevent inter-symbol interference and improve the robustness of the transmission. The guard interval can have different values depending on the 802.11 standard and the configuration of the device. For example, 802.11n supports two guard intervals: 800 ns (normal) and 400 ns (short).
802.11ac supports the same guard intervals as 802.11n, plus an optional 200 ns guard interval for 80 MHz and 160 MHz channels. 802.11ax supports three guard intervals: 800 ns, 1600 ns, and 3200 ns.
The guard interval affects the data rate because it determines the duration of each symbol. A shorter guard interval means more symbols can be transmitted in a given time, resulting in a higher data rate. However, a shorter guard interval also means less protection against inter- symbol interference, which may degrade the signal quality and increase the error rate. Therefore, there is a trade-off between data rate and reliability when choosing the guard interval. The MCS tables for HT and VHT PHY devices show the data rates for different combinations of modulation, coding, channel width, spatial streams, and guard intervals. For example, for a VHT device using MCS 9 with QAM-256 modulation, 5/6 coding rate, 80 MHz channel width, and one spatial stream, the data rate is 433.3 Mbps with a normal guard interval (800 ns) and 486.7 Mbps with a short guard interval (400 ns). Therefore, the guard interval impacts the data rate according to the MCS tables.


NEW QUESTION # 109
What is the most effective method for testing roaming in relation to 802.11 VoIP handsets?

Answer: C

Explanation:
The most effective method for testing roaming in relation to 802.11 VoIP handsets is to place a call with the handset and move around the facility to test quality duringroaming. This method allows you to evaluate the actual performance and user experience of VoIP calls over wireless networks, as well as identify any potential issues such as signal strength, interference, latency, jitter, packet loss, or handoff delays. A spectrum analyzer can only show you the RF activity during a VoIP call, but not how it affects the voice quality or roaming behavior. A protocol analyzer can capture the traffic generated when a laptop roams, but it cannot simulate the characteristics of a VoIP handset such as battery life, antenna design, codec support, or QoS features. A built-in roaming monitor is not a common feature in all VoIP handsets, and it may not provide accurate or comprehensive information about the roaming process. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 487; [Voice over Wireless LAN 4.1 Design Guide], page 6-19.


NEW QUESTION # 110
Which antenna type radiates RF energy equally in all directions in a spherical pattern and is used primarily as a theoretical reference for calculating antenna gain?

Answer: C

Explanation:
An isotropic radiator is a theoretical, hypothetical antenna that radiates RF energy equally in all directions, forming a perfect sphere. It does not exist in reality but is used as a baseline reference point for measuring antenna gain, expressed in dBi (decibels relative to an isotropic radiator). All real-world antennas focus energy in some directions more than others, and their gain is calculated by comparing their radiation pattern to that of the isotropic radiator.


NEW QUESTION # 111
Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

Answer: A

Explanation:
The HT (802.11n) physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS. ERP stands for Extended Rate PHY, which is an extension of the original DSSS (Direct Sequence Spread Spectrum) PHY that supports data rates up to 54 Mbps in the 2.4 GHz band. HR/DSSS stands for High Rate/Direct Sequence Spread Spectrum, which is another extension of DSSS that supports data rates up to 11 Mbps in the 2.4 GHz band. HT stands for High Throughput, which is a new PHY that supports data rates up to 600 Mbps in both the 2.4 GHz and 5 GHz bands. HT uses OFDM (Orthogonal Frequency Division Multiplexing) as its modulation scheme, but it also supports legacy DSSS and ERP devices by using a dual preamble and header structure that allows backward compatibility.


NEW QUESTION # 112
A wireless engineer needs to calculate the total power radiated from an antenna, accounting for transmitter power, cable/connector losses, and antenna gain. What is this calculated value called?

Answer: B

Explanation:
Effective Isotropic Radiated Power (EIRP) is the total amount of power that is effectively radiated from an antenna in the direction of maximum gain, calculated by taking the transmitter's output power, subtracting any losses from cables and connectors, and adding the antenna's gain. EIRP is an important calculation because regulatory bodies, such as the FCC, impose maximum EIRP limits for unlicensed WLAN devices to prevent excessive interference, and exceeding these limits without proper licensing is a regulatory violation.


NEW QUESTION # 113
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