Free Certified Wireless Network Administrator Exam CWNA-109 Exam Practice Test

When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

• Each AP responds in turn after preparing a probe response and winning contention.
• For each probe request frame, only one AP may reply with a probe response.
• Each AP checks with the DHCP server to see if it can respond and then acts accordingly.
• After waiting a SIFS, all APs reply at the same time with a probe response.

Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere with each other when they transmit frames. Assuming no other APs are in the vicinity, is CCI still a possibility in this network and why?

• Yes, because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as clients connected to the other channel 1 AP.
• No, because the APs are far enough apart that no CCI will occur.
• No, because CCI only occurs in the 5 GHz frequency band.
• Yes, because channel 11 loops around and causes CCI with channel 1.

What statement about 802.11 WLAN bridges is true?

• WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
• WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
• WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band
• WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge

An 802.11-based network uses an AP and has several connecting clients. The clients include iPhones, iPads, laptops and one desktop. What WLAN use case is represented?

• Ad-hoc
• WPAN
• BSS
• IBSS

What is an advantage of using WPA3-Personal instead of WPA2-Personal as a security solution for802.11 networks?

• WPA3-Personal, also called WPA3-SAE, uses an authentication exchange and WPA2-Personal does not
• WPA3-Personal, also called WPA3-SAE, uses a stronger authentication exchange to better secure the network
• WPA3-Personal, also called WPA3-SAE, uses AES for encryption and WPA2-Personal does not
• WPA3-Personal, also called WPA3-SAE, uses a better encryption algorithm than WPA2-Personal

You are reporting on the RF environment in your facility. The manager asks you to describe the noise floor noted in the report. Which of the following is the best explanation?

• The noise caused by elevators, microwave ovens, and video transmitters.
• The extra energy radiated by access points and client devices beyond that intended for the signal.
• The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.
• The RF energy that exists in the environment from intentional and unintentional RF radiators that forms the baseline above which the intentional signal of your WLAN must exist.

You are tasked with performing a throughput test on the WLAN. The manager asks that you use open source tools to reduce costs. What open source tool is designed to perform a throughput test?

• iPerf
• PuTTy
• IxChariot
• Python

You have implemented an 802.11ax WLAN for a customer. All APs are four stream HE APs. The customer states that it is essential that most of the clients can use the OFDMA modulation scheme. What do you tell the customer?

• The clients that must support OFDMA must also be upgraded to 802.11ax
• OFDMA is an optional feature of 802.11ax and most APs don't even support it
• All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
• If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades

802. 11ax (HE) introduces Resource Units that can be used to allow communications with multiple devices at the same time, on the same channel, in the same BSS. What feature of 802.1 lax provides this functionality?

• 6 GHz support
• TWT
• Wi-Fi-LTE
• OFDMA

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