CWNP CWNA-109 Guide - CWNP Wireless Network Administrator (CWNA) Realistic Valid Test Fee 100% Pass

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CWNP CWNA-109 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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.
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.

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CWNP Wireless Network Administrator (CWNA) Sample Questions (Q16-Q21):

NEW QUESTION # 16
You are configuring an access point to use channel 128. What important fact should be considered about this channel?

Answer: A

Explanation:
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. References: 1, Chapter 3, page
117; 2, Section 3.2


NEW QUESTION # 17
What is the primary function of the Clear Channel Assessment (CCA) process in the CSMA/CA medium access method?

Answer: C

Explanation:
Clear Channel Assessment (CCA) is a physical layer function used in the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) medium access method. Before a station transmits, it performs CCA to determine whether the RF medium is currently busy (another device is transmitting) or idle. CCA typically involves both physical carrier sense (energy detection and preamble detection) and virtual carrier sense using the Network Allocation Vector (NAV). If the medium is determined to be busy, the station defers transmission and enters a random backoff period.


NEW QUESTION # 18
What term is used to describe multiple RF signal copies arriving at a receiver at slightly different times due to reflection, refraction, scattering, and diffraction?

Answer: B

Explanation:
Multipath occurs when an RF signal takes multiple paths to reach the receiving antenna due to reflection, refraction, diffraction, and scattering. Because each path has a different length, the signal copies arrive at slightly different times with different phases and amplitudes. Multipath can cause data corruption in legacy systems, but modern 802.11n/ac/ax devices use MIMO technology, including techniques like Maximal Ratio Combining and spatial multiplexing, to take advantage of multipath rather than being negatively affected by it.


NEW QUESTION # 19
What security solution is required to be used in place of Open System Authentication for all open network 802.11 implementations in the 6 GHz band?

Answer: D


NEW QUESTION # 20
You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of this connection?

Answer: B

Explanation:
The data rate of a signal is the speed that the data bits in individual 802.11 data frames are sent, but it does not account for the actual amount of data that can be transmitted over time. The throughput of a connection is the flow of information over time, which is affected by various factors such as data encoding, modulation, encryption, airtime utilization, noise levels, interference, etc. Therefore, the throughput is always lower than the data rate. According to one of the web search results1, the actual throughput is normally 60-70 percent of the supported data rates. So, for a connection with a data rate of 150 Mbps, the expected throughput would be around 90-105 Mbps.


NEW QUESTION # 21
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