QUESTION: 29

You have been tasked with creating a wireless link between two buildings on a single campus. The link must support at least 150 Mbps data rates.
What kind of WLAN technology role should you deploy?

WPAN
IBSS
Wireless bridging
Access BSS

Answer(s): C

Explanation:

https://www.wlanmall.com/what-is-a-wireless-bridge/
Wireless bridging is a WLAN technology role that allows two or more networks to be connected wirelessly over a distance. A wireless bridge consists of two or more APs that are configured to operate in bridge mode and use directional antennas to establish a point-to-point or point-to- multipoint link. Wireless bridging can support high data rates and is suitable for scenarios where running cables is impractical or expensive. To create a wireless link between two buildings on a single campus that supports at least 150 Mbps data rates, wireless bridging is an appropriate solution678.

Reference:

CWNA-109 Study Guide, Chapter 6: Wireless LAN Devices and Topologies, page 271; CWNA-109 Study Guide, Chapter 6: Wireless LAN Devices and Topologies, page 265; Wi-Fi Wireless Bridging Explained.

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QUESTION: 30

When implementing PoE, what role is played by a switch?

PSE
Midspan injector
PD
Power splitter

Answer(s): A

Explanation:

PoE stands for Power over Ethernet, which is a technology that allows network devices to receive power and data over the same Ethernet cable. PoE eliminates the need for separate power adapters or outlets for devices such as IP phones, cameras, or APs. PoE requires two types of devices: PSE (Power Sourcing Equipment) and PD (Powered Device). A PSE is a device that provides power to the Ethernet cable, such as a switch, injector, or splitter. A PD is a device that receives power from the Ethernet cable, such as an IP phone, camera, or AP.
When implementing PoE, a switch plays the role of a PSE910.

Reference:

CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 293; CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 287.

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QUESTION: 31

A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?

30 W
12.95 W
25.5 W
15.4 W

Answer(s): C

Explanation:

PoE has different standards that define different power levels for PSEs and PDs. The original standard, IEEE 802.3af, defines two classes of PSEs: Class 3 (15.4 W) and Class 4 (30 W). The newer standard, IEEE 802.3at, also known as PoE+, defines four classes of PSEs: Class 0 (15.4 W), Class 1 (4 W), Class 2 (7 W), and Class 3 (12.95 W). The power level received at the PD is always lower than the power level provided by the PSE, due to cable resistance and power dissipation. The IEEE standards specify the minimum power level that must be received at the PD for each class of PSE. For a Class 4 PSE, the minimum power level received at the PD is 25.5 W910.

Reference:

CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 295; CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 289.

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QUESTION: 32

A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network.
Which one of the following methods is commonly used to locate the controllers by the APs?

NTP
DHCP
SNMP
GRE

Answer(s): B

Explanation:

DHCP (Dynamic Host Configuration Protocol) is a commonly used method to locate the controllers by the APs in a WLAN that is implemented using wireless 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 APs 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. This way, the APs can discover the wireless controller and establish a connection with it. Alternatively, the APs can also use other methods to locate the wireless controller, such as DNS (Domain Name System), broadcast or multicast discovery, or manual configuration.

Reference:

1, Chapter 8, page 309; 2, Section 5.2

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