CWNA-108 Online Practice Questions and Answers

A client complains of low data rates on his computer. When you evaluate the situation, you see that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an 802.11ac client and connects to an 802.11ac AP. Both the client and AP are 2x2:2 devices. What is the likely cause of the low data rate issue?

A. Weak signal strength

B. CAT5e cabling run to the AP

C. Too few spatial streams

D. Lack of support for 802.11n

You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to 2.4 GHz APs, but is does not even see 5 GHz APs. While evaluating the issue, you determine that this problem is happening for all of the laptops of this model in the organization. Several other tablets connect on channel 48 and channel 52 in the same work areas. What is the likely problem?

A. The clients are configured to use WPA and 5 GHz channels only support WPA2.

B. The client drivers are faulty and should be upgraded.

C. The antennas in the laptop have insufficient gain to detect the 5 GHz signals.

D. The access points are configured to disallow 5 GHz.

You are managing a wireless access point in autonomous mode using the Web based interface. You capture traffic during this management task and notice that you can see the HTML code of the Web pages used for access point management. What error in administration could be the cause of this security concern?

A. IPsec is not in use of the management connection as recommended

B. A VPN with the AP is not established

C. WPA2 is disabled on the WLAN

D. HTTP is in use instead of HTTPS

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?

A. 30 W

B. 12.95 W

C. 25.5 W

D. 15.4 W

When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

A. Legacy Power Save mode was removed in the 802.11ac amendment.

B. VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.

C. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.

D. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.

What statement about 802.11 WLAN performance is true?

A. In modem networks, both centralized and distributed data forwarding work well for most standard office deployments

B. In most WLANs, no special skill or tuning is required to get peak performance

C. WLANs perform better as more wireless clients connect with each AP

D. To get the best performance out of an AP, you should disable data rates of 72 Mbps and lower

You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you look for in a protocol analyzers?

A. Frames with the HN bit set to 1

B. Frames with the retry bit set to 0

C. Frames transmitted from the AP without acknowledgement

D. Retransmitted frames from multiple STAs at higher rates than other STAs

What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

A. Signal strength of AP beacons received.

B. PING latency when testing against an Internet server.

C. FCS errors in frames transmitted to and from the AP.

D. Throughput speed in Mbps.

What standard is referenced in the 802.11-2016 specification and is recommended for robust WLAN client security?

A. SSID hiding

B. WEP

C. 802.1X/EAP

D. IPSec VPN

What non-standard WLAN solution attempts to give a longer transmission windows to devices with higher data rates than devices with lower data rates?

A. AirTime Faimess

B. Band Steering

C. ARM

D. RRM

When using a spectrum analyzer to look for non-Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a user's workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?

A. USB 3 device in the user's work area

B. Bluetooth devices in the user's work area

C. Excess RF energy from a nearby AP

D. Unintentional radiation from the PC power supply

What statement describes the authorization component of a AAA implementation?

A. Validating client device credentials against a database.

B. Implementing a WIPS as a full-time monitoring solution to enforce policies.

C. Granting access to specific network services or resources according to a user profile.

D. Verifying that a user is who he says he is.

What feature of 802.1 lax (HE) may impact design decisions related to AP placement and the spacing between same-channel BSS cells (3SAs) because it is designed to reduce overlapping BSS contention?

A. TWT

B. BSS Color

C. uplink MU-MIMO

D. 6 GHz band support

You must plan for POE in an office environment. Which one of these devices is least likely to be a POE PSE?

A. Midspan multi-port injector

B. Switch

C. VolP Phone

D. Midspan injector

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?

A. 6 GHz support

B. TWT

C. Wi-Fi-LTE

D. OFDMA