CWNA-108 Online Practice Questions and Answers

Lynne runs a small hotel, and as a value added service for his customers he has implemented a Wi-Fi hotspot. Lynne has read news articles about how hackers wait at hotspots trying to take advantage of unsuspecting users. He wants to avoid this problem at his hotel.

What is an efficient and practical step that Lynne can take to decrease the likelihood of active attacks on his customers' wireless computers?

A. Enable station-to-station traffic blocking by the access points in the hotel.

B. Implement Network Access Control (NAC) and require antivirus and firewall software along with OS patches.

C. Implement an SSL VPN in the WLAN controller that initiates after HTTPS login.

D. Require EAP-FAST authentication and provide customers with a username/password on their receipt.

What phrase defines Equivalent Isotropically Radiated Power (EIRP)?

A. Power supplied from the transmission line to the antenna input

B. The power output from the radio after cable losses

C. The power output from the radio into the RF cable

D. The highest RF signal strength that is transmitted from a given antenna

You support a WLAN using dual-band 802.11ac three stream access points. All access points have both the 2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 5 GHz and 20 MHz channels in 2.4 GHz. A manager is concerned

about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios.

What do you tell him?

A. His concern is valid and the company should upgrade all Ethernet links to 10 Gbps immediately.

B. His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.

C. His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.

D. Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.

What statement about 802.11 WLAN performance is true?

A. In modern 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

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

A string of characters and digits is entered into an AP a client STA for WPA2 security. The string is 8 characters long. What is this string called?

A. MSK

B. WEP key

C. Passphrase

D. PSK

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

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 Linux shell command can be used to view the hardware and PHY capabilities of a wireless adapter in detail including channel widths, output power setting, channels supported, and more?

A. ifconflg

B. iw phy

C. netsh wlan show device

D. iwconflg

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?

A. The clients that must support OFDMA must also be upgraded to 802.11ax

B. OFDMA is an optional feature of 802.11ax and most APs don't even support it

C. All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz

D. If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades

A POE device requires 47 W of power. What POE specification should be used?

A. 802.3at

B. 802.3af

C. 802.3bt

D. 802. 11at