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NEW QUESTION # 128
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 # 129
You are configuring an access point to use channel 128. What important fact should be considered about this channel?
Answer: C
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.
NEW QUESTION # 130
What is the primary function of the Clear Channel Assessment (CCA) process in the CSMA/CA medium access method?
Answer: A
Explanation:
Clear Channel Assessment (CCA) is a physical layer function used in the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) medium access method. Before a station transmits, it performs CCA to determine whether the RF medium is currently busy (another device is transmitting) or idle. CCA typically involves both physical carrier sense (energy detection and preamble detection) and virtual carrier sense using the Network Allocation Vector (NAV). If the medium is determined to be busy, the station defers transmission and enters a random backoff period.
NEW QUESTION # 131
What field within a Beacon frame is used to inform sleeping stations that the AP has buffered broadcast or multicast traffic to be delivered?
Answer: D
Explanation:
The Traffic Indication Map (TIM) is a field included in every Beacon frame that indicates which associated stations, identified by their Association ID, have buffered unicast frames waiting at the AP. A special variant, the Delivery Traffic Indication Map (DTIM), is sent at a configured interval and informs stations that buffered broadcast or multicast traffic will be delivered following that particular beacon. Stations in power save mode wake periodically to check the TIM/DTIM and determine whether they need to retrieve buffered data.
NEW QUESTION # 132
To ease user complexity, your company has implemented a single SSID for all employees. However, the network administrator needs a way to control the network resources that can be accessed by each employee based in their department.
What WLAN feature would allow the network administrator to accomplish this task?
Answer: B
Explanation:
The WLAN feature that would allow the network administrator to control the network resources that can be accessed by each employee based on their department is Role-Based Access Control (RBAC). RBAC is a method of assigning different permissions and policies to users or groups based on their roles in the organization. RBAC can be implemented by using VLANs, ACLs, or firewalls to restrict access to certain network segments or resources. RBAC can also be integrated with 802.1X/EAP authentication to dynamically assign roles and VLANs to users based on their credentials. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 403; [Role-Based Access Control (RBAC) in Wireless Networks], page 1.
NEW QUESTION # 133
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