| Exam Code | CWNA-107 |
| Exam Name | Certified Wireless Network Administrator |
| Questions | 156 Questions Answers With Explanation |
| Update Date | July 15,2024 |
| Price |
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What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?
A. AES
B. Shared Key Authentication
C.CCMP
D. Open System Authentication
Which one of the following channels can be used for VHT transmissions?
A. 44
B. 1
C. 7
D. 13
What ID is typically mapped to an AP’s MAC address if a single BSS is implemented?
A. VLAN ID
B. BSSID
C. Device ID
D. SSID
Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?
A. VHT (802.11ac)
B. OFDM (802.11a)
C. DSSS (802.11-Prime)
D. HT (802.11n)
ABC Company is planning to install a new 802.11ac WLAN, but wants to upgrade its wired infrastructure first to provide the best user experience possible. ABC Company has hired you to perform the RF site survey.During the interview with the network manager, you are told that the new Ethernet edge switches will support VoIP phones and 802.11 access points, both using 802.3 PoE.After hearing this information, what immediate concerns do you note?
A. The power budget in the edge switches must be carefully planned and monitored based on the number of supported PoE devices.
B. The edge Ethernet switches should support Ether-channel to get the best results out of the network.
C. VoIP phones and 802.11 access points should not be powered by the same edge switch due to distortion.
D. If the switches are in optimal locations for VoIP phones, they are likely to be suboptimal locations for 802.11 APs
What factor will have the most significant impact on the amount of wireless throughput available to each station within a BSS?
A. The Layer 3 protocol used by each station to transmit data over the wireless link
B. The number of client stations associated to the BSS
C. The power management settings in the access point beacons
D. The presence of co-located (10m away) access points on non-overlapping channels
You were previously onsite at XYZ’s facility to conduct a pre-deployment RF site survey. The WLAN has been deployed according to your recommendations and you are onsite again to perform a post-deployment validation survey.When performing this type of post-deployment RF site survey voice over Wi-Fi, what is an action that must be performed?
A. Spectrum analysis to locate and identify RF interference sources.
B. Frequency-band hopping analysis to detect improper RF channel implementations.
C. Protocol analysis to discover channel use on neighboring APs.
D. Application analysis with an active phone call on an VoWiFi handset.
You are reporting on the RF environment in your facility. The manager asks you do describe the noise floor noted on the report. Which of the following is the best explanation?
A. The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.
B. The noise caused by elevators, microwave ovens, and video transmitters.
C. 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.
D. The extra energy radiated by access points and client devices beyond that intended for the signal.
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.
You are troubleshooting a client problem with a 2.4 GHz WLAN connection. The client is experiencing surprisingly low data rates during the work day. You analyze the workspace outside of business hours and detect a strong signal with a typical noise floor at the client location. During working hours, the user works with a laptop in the area and uses an external USB hard drive for continuous data access. The user also states that the laptop works as expected on her home network. The user working approximately 8 feet away from this client experiences no problems.Based on this information, what is the likely cause of the problem?
A. The laptop has a failing wireless adapter
B. the AP is overloaded during the work day
C. The external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use
D. The drives in the laptop are corrupt
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
A client STA must choose the best AP for connectivity. As part of the evaluation, it must verify compatible data rates. What can the client STA use to verify that an AP supports the same data rates that it supports?
A. Beacon frames transmitted by the AP
B. Data frames sent between the AP and current client STAs
C. Authentication frames transmitted by the other client STAs
D. Probe request frames transmitted by other client STAs
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 antennas in the laptop have insufficient gain to detect the 5 GHz signals.
C. The access points are configured to disallow 5 GHz.
D. The client drivers are faulty and should be upgraded.
When a STA has authenticated to an AP (AP-1), but still maintains a connection with another AP (AP-2), what is the state of the STA on AP-1?
A. Transitional
B. Unauthenticated and Unassociated
C. Authenticated and Unassociated
D. Authenticated and Associated
You are evaluating access points for use in the 5 GHZ frequency band. What PHY supports this band and supports 80 MHz channels?
A. OFDM
B. HT
C. VHT
D. ERP
An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain. What is the EIRP power output?
A. 2 W
B. 250 mW
C. 1000 mW
D. 500 mW
You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to your GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz SSIDs, which are different that the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with no difficulty. What is the likely problem?
A. Interference from no-Wi-Fi sources
B. Faulty drivers
C. DoS attack
D. Interference from other WLANs
What best describes WPA2 in relation to 802.11 wireless networks?
A. WPA2 is specified in the 802.11 standard as implementing CCMP/AES.
B. WPA2 is the standard that defines security for WLANs.
C. WPA2 is a certification created by the Wi-Fi Alliance that validates devices correctly implement CCMP/AES.
D. WPA2 is the second version of WPA and it enhances security through the use of TKIP instead of WEP.
What statement about 802.11 WLAN bridges is true?
A. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
B. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
C. WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band
D. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge
You are attempting to explain RF shadow and how it can cause lack of coverage. What common building item frequently causes RF shadow and must be accounted for in coverage plans?
A. Wooden doors
B. Carpeted floors
C. Elevators
D. Cubicle partitions
