CWNA-109 Studienmaterialien: CWNP Wireless Network Administrator (CWNA) & CWNA-109 Zertifizierungstraining

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CWNP CWNA-109 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: WLAN Network Security15%- Security threats and mitigation
  • 1. Attacks, monitoring, and hardening
- Authentication and encryption
  • 1. WPA2/WPA3, 802.1X, EAP
Topic 2: Radio Frequency (RF) Technologies20%- Antenna concepts and types
  • 1. Signal propagation and coverage
  • 2. Antenna operation and selection
- RF fundamentals and behavior
  • 1. RF mathematics and measurements
  • 2. RF signals and characteristics
Topic 3: WLAN Protocols and Devices20%- Wireless hardware and software
  • 1. Power over Ethernet (PoE)
  • 2. Access points, controllers, and clients
- 802.11 frame types and formats
  • 1. Frame exchange and channel access
Topic 4: WLAN Network Architecture and Design Concepts15%- WLAN deployment architectures
  • 1. Coverage and capacity planning
  • 2. Roaming and mobility
- Network design principles
  • 1. Site survey methodologies
Topic 5: WLAN Troubleshooting and Management15%- Monitoring and maintenance
  • 1. Management protocols and tools
- Performance and connectivity issues
  • 1. Interference, coverage, and configuration problems
Topic 6: WLAN Regulations and Standards15%- Regulatory bodies and frequency bands
  • 1. Transmit power and channel rules
- IEEE 802.11 standards and amendments
  • 1. PHY and MAC layer specifications

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CWNP Wireless Network Administrator (CWNA) CWNA-109 Prüfungsfragen mit Lösungen (Q173-Q178):

173. Frage
What is the maximum channel bandwidth supported by the 802.11ac amendment operating in the
5 GHz band?

Antwort: D

Begründung:
The 802.11ac amendment supports channel bonding up to 160 MHz in the 5 GHz band, in addition to 20 MHz, 40 MHz, and 80 MHz channel widths. While 160 MHz channels can significantly increase theoretical throughput, they also consume a large portion of the available 5 GHz spectrum and can be difficult to implement in real-world deployments due to limited channel availability and increased susceptibility to interference. 320 MHz channel widths were later introduced with 802.11be (Wi-Fi 7) in the 6 GHz band.


174. Frage
A wireless engineer needs to calculate the total loss of an RF signal as it travels through free space between a transmitting and receiving antenna. What is this calculation called?

Antwort: D

Begründung:
Free space path loss (FSPL) is the loss of signal strength that occurs as an RF wave propagates through free space, with no obstructions, over a given distance. FSPL increases as the distance between the transmitter and receiver increases, and it also increases with higher frequencies.
FSPL is a critical calculation in designing outdoor point-to-point and point-to-multipoint bridge links, as it directly affects the link budget calculation needed to ensure adequate signal strength at the receiver.


175. Frage
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

Antwort: B

Begründung:
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 . References: [CWNA-109 Study Guide], Chapter 4:
Radio Frequency Signal and Antenna Concepts, page 163; [CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 157.


176. Frage
During a post-implementation survey, you have detected a non-802.11 wireless device transmitting in the area used by handheld 802.11g scanners. What is the most important factor in determining the impact of this non-802.11 device?

Antwort: B

Begründung:
Airtime Utilization is a per-channel statistic that defines what percentage of the channel is currently being used, and what percentage is therefore free. Airtime usage can come from: Data traffic to and from client devices. Interference from WiFi and non-WiFi sources. Management overhead from APs and client devices.


177. Frage
You are implementing a multi-AP WLAN and fast secure roaming is essential. Which one of the following methods is an IEEE 802.11 standard method for fast roaming?

Antwort: D

Begründung:
FT (Fast Transition) is an IEEE 802.11 standard method for fast roaming. FT is defined in the IEEE 802.11r amendment and is also known as Fast BSS Transition (FBT) or Fast Secure Roaming. FT is a feature that allows a client station to quickly switch from one AP to another within the same ESS (Extended Service Set) without having to re-authenticate and re-associate with each AP. This reduces the latency and packet loss that may occur during roaming, thus improving the user experience and maintaining the security of the connection.
FT works by using pre-authentication and key caching mechanisms that allow the client station and the APs to exchange security information before the actual roaming occurs. This way, when the client station decides to roam to a new AP, it can use a fast reassociation request and response that contain only a few fields, instead of a full authentication and association exchange that require more time and data. References: 1, Chapter 9, page
367; 2, Section 6.3


178. Frage
......

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