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| Section | Objectives |
|---|---|
| WLAN Infrastructure and Devices | - Access points and client devices
|
| 802.11 Protocol and MAC Layer | - Frame types and communication process
|
| WLAN Regulations and Standards | - Wireless standards and amendments
|
| RF Technologies and Fundamentals | - Radio frequency principles and behavior
|
| WLAN Network Design | - Design principles and planning
|
| WLAN Security and Management | - Security mechanisms and monitoring
|
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NEW QUESTION # 73
You must plan for POE in an office environment. Which one of these devices is least likely to be a POE PSE?
Answer: B
Explanation:
A VoIP phone is least likely to be a POE PSE of the devices listed. POE stands for Power over Ethernet, which is a technology that allows devices to receive both power and data over a single Ethernet cable. A POE PSE stands for Power Sourcing Equipment, which is a device that provides power to other devices over Ethernet. A POE PD stands for Powered Device, which is a device that receives power from a PSE over Ethernet. A midspan multi-port injector, a switch, and a midspan injector are examples of POE PSEs, as they can supply power to multiple devices over Ethernet cables. A VoIP phone is an example of a POE PD, as it can receive power from a PSE over an Ethernet cable. However, some VoIP phones can also act as POE PSEs for other devices, such as IP cameras or wireless access points, but this is not very common.
NEW QUESTION # 74
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?
Answer: D
Explanation:
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.
NEW QUESTION # 75
You are troubleshooting a client problem with a 2.4 GHz WLAN connection. The client is experiencing surprisingly low data rates during the work day. You analyze the workspace outside of business hours and detect a strong signal with a typical noise floor at the client location. During working hours, the user works with a laptop in the area and uses an external USB hard drive for continuous data access. The user also states that the laptop works as expected on her home network. The user working approximately 8 feet away from this client experiences no problems.
Based on this information, what is the likely cause of the problem?
Answer: D
Explanation:
The likely cause of the problem is that the external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use. USB 3.0 devices are known to generate radio frequency interference (RFI) in the 2.4 GHz band due to their high data transfer rates and harmonics. This RFI can increase the noise floor and degrade the signal-to-noise ratio (SNR) of WLAN devices operating in the same band. This can result in lower data rates, reduced throughput, increased retransmissions, and poor performance. The problem may not occur outside of business hours or on the user's home network because of different usage patterns or environmental factors.
NEW QUESTION # 76
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?
Answer: D
Explanation:
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: ExamCWNA-109, by David D: Coleman and David A. Westcott.
* Understanding 2.4 GHz channel arrangement and interference patterns in 802.11 wireless networks.
NEW QUESTION # 77
What condition occurs when two or more APs operating on the same channel are within range of each other, causing them to share airtime through the CSMA/CA contention process?
Answer: C
Explanation:
Co-channel interference (CCI) occurs when two or more APs, or BSSs, are configured on the same channel and are within range of each other. Because they operate on the same channel, they must share airtime using the CSMA/CA contention mechanism, meaning only one device can transmit at a time to avoid frame corruption. While technically not "interference" in the destructive sense of corrupting a signal, CCI reduces available airtime and overall network throughput as more devices compete for the same channel.
NEW QUESTION # 78
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