CWNA-109考試證照 - CWNA-109考古題介紹

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CWNP CWNA-109 Exam Syllabus Topics:

SectionWeightObjectives
IEEE 802.11 Network Operations15%- Performance Optimization
  • 1. QoS (WMM)
  • 2. Channel management
  • 3. Roaming (802.11r/k/v)
- Troubleshooting
  • 1. Protocol analysis
  • 2. Spectrum analysis
  • 3. Common connectivity issues
IEEE 802.11 Protocols and Devices20%- 802.11 Frame Types
  • 1. Management, Control, and Data frames
  • 2. Frame exchange processes
- WLAN Architecture
  • 1. Independent Basic Service Set (IBSS)
  • 2. Stations (STA), Access Points (AP)
  • 3. Distribution System (DS)
  • 4. Extended Service Set (ESS)
  • 5. Basic Service Set (BSS)
- CSMA/CA
  • 1. RTS/CTS
  • 2. DCF and EDCA
IEEE 802.11 Network Security15%- Security Basics
  • 1. WPA2 and WPA3
  • 2. Authentication and Association
  • 3. Legacy security (WEP, WPA)
- Encryption and Authentication
  • 1. CCMP, GCMP
  • 2. OWE and SAE
  • 3. 802.1X/EAP
IEEE 802.11 Network Implementation20%- Deployment Models
  • 1. Distributed and Centralized architectures
  • 2. Cloud-based and Controller-based
  • 3. Autonomous APs
- Power over Ethernet (PoE)
  • 1. 802.3af, 802.3at, 802.3bt
- Site Survey and Design
  • 1. AP placement and density
  • 2. Predictive and Passive site surveys
  • 3. Active site surveys
Radio Frequency (RF) Technologies15%- Antenna Concepts
  • 1. Antenna types and usage
  • 2. Antenna gain and patterns
  • 3. Polarization
- RF Mathematics
  • 1. Link budget calculations
  • 2. Inverse Square Law
  • 3. dB, dBi, dBd, dBm
- RF Fundamentals
  • 1. Wavelength, frequency, and amplitude
  • 2. RF behaviors: absorption, reflection, refraction, diffraction, scattering
  • 3. Signal strength and loss (attenuation)
IEEE 802.11 Regulations and Standards15%- IEEE 802.11 Standards
  • 1. 802.11-2020 and amendments (a/b/g/n/ac/ax)
  • 2. 802.11be (Wi-Fi 7) overview
  • 3. Channel bonding and widths
- Regulatory Bodies and Domains
  • 1. FCC, ETSI, IC, and others
  • 2. Frequency bands and channels

>> CWNA-109考試證照 <<

CWNA-109考古題介紹，最新CWNA-109考證

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最新的 CWNA Certification CWNA-109 免費考試真題 (Q166-Q171):

問題 #166
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

答案：D

解題說明：
In the 2.4 GHz frequency band used for 802.11 wireless networks, the channel bandwidth is typically 20 MHz, but the actual frequency spread of each channel is about 22 MHz due to the modulation techniques used. This spread causes overlap between adjacent channels, which can lead to interference and degrade network performance. To avoid this, it's essential to use non-overlapping channels.
The three non-overlapping channels in the 2.4 GHz band are 1, 6, and 11. Each of these channels is spaced sufficiently apart to avoid interference with each other:
* Channel 1: Centered at 2.412 GHz.
* Channel 6: Centered at 2.437 GHz.
* Channel 11: Centered at 2.462 GHz.
Given the options provided, option C (1 and 5) is the closest to a pair of non-overlapping channels, although in practice, channel 5 would still cause some interference with channel 1 due to the 22 MHz spread. The ideal choice for non-overlapping channels would be any two channels among 1, 6, and 11, but this is not an option provided. Therefore, within the given options, 1 and 5 are the best choice, understanding that in a real-world scenario, 1 and 6 or 6 and 11 would be preferred to avoid overlap.
References:
CWNA Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109, by David D.
Coleman and David A. Westcott.
Understanding 2.4 GHz channel arrangement and interference patterns in 802.11 wireless networks.


問題 #167
When an ACK frame is not received by the transmitting STA, what is assumed?

答案：B

解題說明：
An ACK (Acknowledgement) frame is a short control frame that is sent by the receiver of a data or management frame to confirm that the frame was received correctly. The ACK frame is sent after a SIFS (Short Interframe Space) interval, which is the shortest time gap between frames in
802.11. If the transmitter does not receive an ACK frame within a specified time, it assumes that the frame was not delivered and must be retransmitted. This is part of the 802.11 reliability mechanism that ensures reliable data delivery over an unreliable wireless medium.


問題 #168
Which one of the following channels can be used for VHT transmissions according to the 802.11 specification?

答案：C

解題說明：
The channel that can be used for VHT transmissions according to the 802.11 specification is channel 144.
VHT stands for Very High Throughput and is the PHY layer specification for 802.11ac devices. VHT transmissions can use channel bandwidths of 20 MHz, 40 MHz, 80 MHz, or 160 MHz in the 5 GHz band.
Channel 144 is one of the channels in the 5 GHz band that can support VHT transmissions with any of these bandwidths. Channel 6, channel 1, and channel 11 are channels in the 2.4 GHz band that cannot support VHT transmissions, as they are only compatible with legacy (802.11b/g/n), HT (802.11n), or ERP (802.11g) transmissions with up to 20 MHz bandwidth. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 214; [CWNA: Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 204.


問題 #169
A network administrator wants to reduce co-channel interference in a high-density 2.4 GHz deployment. What is the recommended best practice for channel planning in this band?

答案：B

解題說明：
In the 2.4 GHz band, only three channels, 1, 6, and 11, are non-overlapping when using standard
20 MHz channel widths in regions like the United States. Using any other channels, or overlapping adjacent channels, results in adjacent channel interference, which degrades performance for all nearby devices. Best practice for 2.4 GHz deployments is to design the channel reuse pattern using only channels 1, 6, and 11, and to avoid 40 MHz channel bonding in this band due to the limited number of available channels.


問題 #170
You administer a WLAN that offers a guest SSID of GUESTNWORK. Users connect to the GUESTNWORK SSID, but report that they cannot browse the Internet. The devices simply report no Internet connection. What common problem causes this scenario?

答案：D

解題說明：
A common problem that causes this scenario is captive portal issues. A captive portal is a web page that requires users to authenticate or accept terms and conditions before accessing the Internet through a WLAN. A captive portal is often used for guest networks to provide security and control over the network access. A captive portal works by intercepting the user's web requests and redirecting them to the portal page until the user completes the required action.
However, sometimes the captive portal may not work properly due to various reasons, such as browser settings, firewall rules, DNS configuration, or network errors. This can prevent the user from browsing the Internet or seeing the portal page. To troubleshoot captive portal issues, you can try to use a different browser, clear the browser cache and cookies, disable any VPN or proxy settings, manually enter the portal URL, or contact the network administrator. NTP issues, hardware issues, or IP routing issues are not common problems that cause this scenario.


問題 #171
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