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| Section | Weight | Objectives |
|---|---|---|
| IEEE 802.11 Regulations and Standards | 15% | - Regulatory Bodies and Domains
|
| IEEE 802.11 Protocols and Devices | 20% | - CSMA/CA
|
| IEEE 802.11 Network Security | 15% | - Security Basics
|
| IEEE 802.11 Network Implementation | 20% | - Deployment Models
|
| IEEE 802.11 Network Operations | 15% | - Troubleshooting
|
| Radio Frequency (RF) Technologies | 15% | - Antenna Concepts
|
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NEW QUESTION # 182
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 # 183
What networking component connects multiple access points together and to other networking infrastructure, such as a switch, allowing an Extended Service Set to function as a unified network?
Answer: D
Explanation:
The Distribution System (DS) is the underlying network infrastructure, typically the wired Ethernet network, that connects multiple access points together within an Extended Service Set (ESS).
The Distribution System allows data frames to be forwarded between different APs, and out to other network resources, enabling a seamless roaming experience for client stations as they move between the coverage areas of different APs that are all part of the same ESS.
NEW QUESTION # 184
What statement about 802.11 WLAN bridges is true?
Answer: D
Explanation:
WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally. A WLAN bridge is a device that connects two or more networks using the 802.11 protocol. A WLAN bridge must have a clear and strong signal between the two endpoints to ensure reliable and fast data transmission. The signal-to-noise ratio (SNR) is a measure of the quality of the signal, which depends on the distance, interference, obstacles, and antenna gain between the transceivers. A higher SNR means a better signal quality and a higher data rate. A lower SNR means a worse signal quality and a lower data rate. Therefore, a WLAN bridge must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally.
NEW QUESTION # 185
When antenna gain is reported in dBi, the gain of the antenna is compared to what theoretical radiator?
Answer: D
Explanation:
An isotropic radiator is a theoretical point source of electromagnetic radiation that radiates equally in all directions. It has no physical dimensions and no preferred direction of radiation. It is used as a reference for antenna gain because it represents the ideal case of a perfect omnidirectional antenna12 Antenna gain is a measure of how well an antenna concentrates its radiated power in a certain direction. It is expressed in decibels (dB) relative to a reference antenna. Whenthe reference antenna is an isotropic radiator, the antenna gain is denoted by dBi, which stands for decibels relative to isotropic12 For example, an antenna with a gain of 3 dBi means that it radiates 3 dB more power in its main direction than an isotropic radiator would. Conversely, an antenna with a gain of -3 dBi means that it radiates 3 dB less power in its main direction than an isotropic radiator would12
NEW QUESTION # 186
When antenna gain is reported in dBi, the gain of the antenna is compared to what theoretical radiator?
Answer: D
Explanation:
An isotropic radiator is a theoretical point source of electromagnetic radiation that radiates equally in all directions. It has no physical dimensions and no preferred direction of radiation. It is used as a reference for antenna gain because it represents the ideal case of a perfect omnidirectional antenna.
Antenna gain is a measure of how well an antenna concentrates its radiated power in a certain direction. It is expressed in decibels (dB) relative to a reference antenn a. When the reference antenna is an isotropic radiator, the antenna gain is denoted by dBi, which stands for decibels relative to isotropic.
NEW QUESTION # 187
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