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| Section | Weight | Objectives |
|---|---|---|
| WLAN Regulations and Standards | 15% | - Regulatory bodies and frequency bands
|
| WLAN Network Architecture and Design Concepts | 15% | - Network design principles
|
| WLAN Troubleshooting and Management | 15% | - Performance and connectivity issues
|
| WLAN Protocols and Devices | 20% | - Wireless hardware and software
|
| WLAN Network Security | 15% | - Security threats and mitigation
|
| Radio Frequency (RF) Technologies | 20% | - RF fundamentals and behavior
|
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質問 # 48
When an ACK frame is not received by the transmitting STA, what is assumed?
正解：C
解説：
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.
質問 # 49
A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?
正解：B
解説：
To calculate the EIRP at the antenna element, we need to add the transmitter output power, subtract the cable loss, and add the antenna gain. All these values need to be converted to dBm first, if they are not already given in that unit. In this case, we have:
Transmitter output power = 50 mW = 10 log (50) dBm = 16.99 dBm Cable loss = 3 dB Antenna gain = 9 dBi EIRP = Transmitter output power - Cable loss + Antenna gain EIRP = 16.99 - 3 + 9 EIRP = 22.99 dBm Rounding up to the nearest integer, we get 23 dBm as the EIRP at the antenna element12. References: CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page
92; CWNA-109Study Guide, Chapter 2: Radio Frequency Fundamentals, page 88.
質問 # 50
What 802.11 amendment introduces Wireless Network Management (WNM) capabilities, including BSS Transition Management, which allows an AP to suggest that a client roam to a different AP?
正解：C
解説：
802.11v, known as Wireless Network Management, introduces several capabilities, including BSS Transition Management. This feature allows an AP or WLAN controller to send a request to a client device suggesting that it roam to a different, more suitable AP, such as one with a stronger signal or lower channel utilization. While the client is not obligated to comply, many modern devices support this feature, which helps improve load balancing and overall network performance, a technique commonly referred to as client steering.
質問 # 51
You are deploying a WLAN with the access points configured for 10 mW of output power on the
2.4 GHz radios and 20 mW of output power on the 5GHz radios. Some semi-directional antennas are also in use. What kind of deployment is described?
正解：A
解説：
A high-density deployment is a wireless network that is designed to support a large number of users and devices in a relatively small area. This type of deployment is often used in enterprise environments, such as offices, schools, and hospitals. The use of semi-directional antennas in the deployment described in the question is a good indication that it is a high-density deployment.
Semi-directional antennas can be used to focus the signal from an access point in a specific direction. This can help to reduce interference and improve performance in high-density environments.
The other answer choices are less likely to be correct for the following reasons:
SOHO (small office/home office) deployments are typically smaller and less complex than high- density deployments.
Residential deployments are typically even smaller and less complex than SOHO deployments.
Standard office deployments may be high-density, but they may also be lower-density. It is important to note that the type of deployment is not determined solely by the output power of the access points. However, the use of 10 mW of output power on the 2.4 GHz radios and 20 mW of output power on the 5GHz radios is also consistent with a high-density deployment. Here are some additional tips for deploying a high-density wireless network:
Use a site survey to determine the optimal placement of access points. Configure the access points to use non-overlapping channels. Use semi-directional or directional antennas to focus the signal and reduce interference. Implement a wireless intrusion prevention system (WIPS) to detect and mitigate rogue access points and other security threats.
質問 # 52
What is the purpose of an RF connector's impedance rating, and what is the standard impedance used in 802.11 WLAN systems?
正解：C
解説：
Impedance is a measure of the opposition to current flow in an RF circuit, and it is critical that all components in an RF system, including cables, connectors, and antennas, share the same impedance rating. In 802.11 WLAN systems, the standard impedance is 50 ohms. When impedance is mismatched between components, some of the signal is reflected back toward the source instead of being radiated by the antenna, resulting in signal loss and reduced performance, a condition measured using Voltage Standing Wave Ratio (VSWR).
質問 # 53
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