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| Section | Weight | Objectives |
|---|---|---|
| WLAN Network Security | 15% | - Authentication and encryption
|
| Radio Frequency (RF) Technologies | 20% | - Antenna concepts and types
|
| WLAN Protocols and Devices | 20% | - Wireless hardware and software
|
| WLAN Troubleshooting and Management | 15% | - Monitoring and maintenance
|
| WLAN Network Architecture and Design Concepts | 15% | - WLAN deployment architectures
|
| WLAN Regulations and Standards | 15% | - Regulatory bodies and frequency bands
|
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NEW QUESTION # 24
What is the function of the Network Allocation Vector (NAV) in an 802.11 WLAN?
Answer: C
Explanation:
The Network Allocation Vector (NAV) is a timer used as part of virtual carrier sensing in 802.11 networks. When a station receives a frame that includes a Duration field, such as an RTS, CTS, or data frame, it sets its NAV timer to that duration, effectively reserving the medium for that period of time. Other stations that hear this frame will defer any transmission attempts until their NAV timer expires, helping to prevent collisions and hidden node issues even when a station cannot directly sense the transmitting device.
NEW QUESTION # 25
You are installing an AP to be used by 27 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?
Answer: D
Explanation:
A 5 GHz channel should be used for this AP because channels 1 and 6 are 2.4 GHz channels and they have no impact on the decision. The 5 GHz frequency band offers more non-overlapping channels than the 2.4 GHz frequency band, which reduces interference and improves performance. The 5 GHz frequency band also supports higher data rates and wider channel bandwidths than the 2.4 GHz frequency band, which increases capacity and throughput. The 5 GHz frequency band also has less interference from other devices and sources than the 2.4 GHz frequency band, which enhances reliability and quality of service. Therefore, it is recommended to use the 5 GHz frequency band for WLANs whenever possible. Channels 1 and 6 are two of the three non-overlapping channels in the 2.4 GHz frequency band (the other one is channel 11). They are used by a neighbor network in this scenario, but they do not affect the channel selection for this AP because they operate in a different frequency band than the 5 GHz frequency band. Channel 6 is not always best to use; it depends on the interference and congestion level in the environment. Channel 1 is not best to use because it has a lower frequency than channel 6; frequency does not determine channel quality or performance. Channel 11 is not best to use because it is also a 2.4 GHz channel and it may interfere with channels 1 and 6. References: CWNA-109 Study Guide, Chapter 4: Antenna Systems and Radio Frequency (RF) Components, page 113
NEW QUESTION # 26
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 # 27
Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?
Answer: D
Explanation:
DHCP (Dynamic Host Configuration Protocol) is the network service where option 43 must be configured to allow access points to locate controllers. DHCP is a protocol that allows a device to obtain an IP address and other network configuration parameters from a server. In a wireless controller scenario, the access points can use DHCP to request an IP address from a DHCP server, which can also provide the IP address or hostname of the wireless controller as an option in the DHCP response. Option 43 is a vendor-specific option that can be used to encode custom information for different types of devices. For example, Cisco access points can use option 43 to receive the IP address of the wireless controller from the DHCP server, while Aruba access points can use option 43 to receive the hostname of the wireless controller from the DHCP server. This way, the access points can discover the wireless controller and establish a connection with it.
NEW QUESTION # 28
A wireless engineer is designing a WLAN and wants to allow client devices to roam between access points without re-authenticating through the full 802.1X/EAP process at each AP, reducing handoff time for latency-sensitive applications like VoWiFi. What 802.11 amendment addresses this?
Answer: A
Explanation:
802.11r, also known as Fast BSS Transition (FT), enables fast and secure roaming between access points within the same ESS by allowing the initial key derivation for a new AP to occur before the client actually roams, rather than requiring a full 802.1X/EAP re-authentication at each new AP. This significantly reduces roaming latency, which is critical for time-sensitive applications like Voice over Wi-Fi (VoWiFi), where delays can cause noticeable call quality degradation.
NEW QUESTION # 29
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