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NEW QUESTION # 31
Your manager asked you to locate a solution that allows for centralized monitoring of WLAN performance over time. He wants a single pane of glass for administration and monitoring of the solution. What do you recommend?
- A. AP-based spectrum analysis
- B. Laptop-based spectrum analyzers
- C. Laptop-based protocol analyzers
- D. Overlay WLAN monitoring solution
Answer: D
Explanation:
Explanation
The solution that you recommend is an Overlay WLAN monitoring solution. An Overlay WLAN monitoring solution is a system that uses dedicated sensors or probes to monitor the WLAN performance over time. The sensors are deployed throughout the WLAN coverage area and collect data on various metrics such as signal strength, noise level, channel utilization, interference, throughput, latency, packet loss, and QoS. The sensors send the data to a centralized server or appliance that analyzes the data and provides a single pane of glass for administration and monitoring of the solution. An Overlay WLAN monitoring solution can help to detect and troubleshoot WLAN issues, optimize WLAN performance, and generate reports and alerts. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 538; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 508.
NEW QUESTION # 32
What term correctly completes the following sentence?
In an IEEE 802.11 frame, the IP packet is considered by the MAC layer to be a(n) _________.
- A. PLCP Service Data Unit (PSDU)
- B. PLCP Protocol Data Unit (PPDU)
- C. IP datagram
- D. MAC Protocol Data Unit (MPDU)
- E. MAC Service Data Unit (MSDU)
Answer: E
NEW QUESTION # 33
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 external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use
- B. The AP is overloaded during the work day
- C. The drivers in the laptop are corrupt
- D. The laptop has a failing wireless adapter
Answer: A
Explanation:
Explanation
The likely cause of the problem is that the external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use. USB 3.0 devices are known to generate radio frequency interference (RFI) in the 2.4 GHz band due to their high data transfer rates and harmonics. This RFI can increase the noise floor and degrade the signal-to-noise ratio (SNR) of WLAN devices operating in the same band. This can result in lower data rates, reduced throughput, increased retransmissions, and poor performance. The problem may not occur outside of business hours or on the user's home network because of different usage patterns or environmental factors. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 527; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 497.
NEW QUESTION # 34
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?
- A. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.
- 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. Legacy Power Save mode was removed in the 802.11ac amendment.
Answer: C
NEW QUESTION # 35
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?
- A. OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
- B. OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
- C. OFDM modulation is used only in 5 GHz 802.11 transmissions.
- D. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
Answer: A
Explanation:
https://en.wikipedia.org/wiki/IEEE_802.11
NEW QUESTION # 36
You are deploying a WLAN with the access points configured for 10 mW of output power on the 2.4 GHz radios and 20 mW of output power on the 5GHz radios. Some semi-directional antennas are also in use. What kind of deployment is described?
- A. SOHO
- B. High density
- C. Standard office
- D. Residential
Answer: A
Explanation:
Explanation/Reference:
NEW QUESTION # 37
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?
- A. iPerf
- B. Python
- C. IxChariot
- D. PuTTy
Answer: A
NEW QUESTION # 38
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 each other when they transmit frames. Assuming no other Aps are in the vicinity, is CCI still a possibility in this network and why?
- A. No, because CCI only occurs in the 5 GHz frequency band
- B. 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
- C. No, because the Aps are far enough apart that no CCI will occur
- D. Yes, because channel 11 loops around and causes CCI with channel 1
Answer: B
NEW QUESTION # 39
The requirements for a WLAN you are installing state that it must support unidirectional delays of less than
150 ms and the signal strength at all receivers can be no lower than -67 dBm. What application is likely used that demands these requirements?
- A. E-Mail
- B. FTP
- C. RTLS
- D. VoIP
Answer: D
NEW QUESTION # 40
A string of characters and digits is entered into an AP and a client STA for WPA2 security. The string is 8 characters long. What is this string called?
- A. Passphrase
- B. MSK
- C. WEP key
- D. PSK
Answer: A
Explanation:
Explanation
The string of characters and digits that is entered into an AP and a client STA for WPA2 security and is 8 characters long is called a passphrase. A passphrase is a human-readable text that is used to generate a Pre-Shared Key (PSK) for WPA2-Personal security. A passphrase can be between 8 and 63 characters long and can include any ASCII character. The PSK is a 256-bit key that is derived from the passphrase using a hashing algorithm called PBKDF2. The PSK is used to encrypt and decrypt the data frames between the AP and the client STA. A MSK is a Master Session Key that is generated by an authentication server for WPA2-Enterprise security. A WEP key is a 40-bit or 104-bit key that is used for Wired Equivalent Privacy (WEP) security, which is deprecated and insecure. A PSK is not a string of characters and digits, but a binary key. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 303; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 293.
NEW QUESTION # 41
The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).
What is the center frequency of channel 4?
- A. 2.427 GHz
- B. 2.422 GHz
- C. 2.413 GHz
- D. 2.417 GHz
Answer: A
NEW QUESTION # 42
A natural disaster has occurred in a remote area that is approximately 40 miles from the response team headquarters. The response team must setup a local wireless network using 802.11 WLAN access points. What is the best method, of those listed, for implementation of network backhaul for communications across the Internet in this scenario?
- A. Temporary wired DSL
- B. Temporary wired cable
- C. 802.11 bridging
- D. Cellular/LTE
Answer: D
NEW QUESTION # 43
What parameter of the client driver should be configured on a Windows computer to optimize moving from one AP to another within the ESS?
- A. Band preference
- B. Roaming threshold
- C. SSID selection
- D. ESSID selection
Answer: B
NEW QUESTION # 44
Your consulting firm has recently been hired to complete a site survey for a company. Your engineers use predictive modeling software for surveying, but the company insists on a pre- deployment site visit.
What task should be performed as part of the pre-deployment visit to prepare for a predictive survey?
- A. Evaluatethe building materials at ABC's facility and confirm that the floor plan documents are consistent with the actual building.
- B. Test several antenna types connected to the intended APs for use in the eventual deployment.
- C. Collect information about the company's security requirements and the current configuration of their RADIUS and user database servers.
- D. Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls.
Answer: A
NEW QUESTION # 45
As XYZ Company's wireless specialist, you have been asked to troubleshoot some unexpected frame patterns in a wireless protocol capture. Your peers explain that the network's beacon frames are inconsistent. That is, the BSSID is the same for all beacons, but the source address varies between three different addresses.
What network configuration would cause this beacon frame behavior?
- A. A single AP supports multiple BSSs with different SSIDs
- B. The beacons are from an IBSS instead of a BSS
- C. Three APs still share the same default configuration.
- D. A virtual cell single channel network has been implemented
Answer: B
NEW QUESTION # 46
What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?
- A. DMG
- B. SIG
- C. DSSS
- D. TVHT
Answer: C
Explanation:
https://www.cwnp.com/802-11ac-vht-just-the-facts/
NEW QUESTION # 47
In an 802.11n (H T) 2.4 GHz BSS, what prevents each station from using all the airtime when other client stations are actively communicating in the same BSS?
- A. 802.11 DOS prevention
- B. CSMA/CD
- C. OFDMA
- D. CSMA/CA
Answer: D
Explanation:
Explanation
What prevents each station from using all the airtime when other client stations are actively communicating in the same BSS is CSMA/CA. CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance and is a media access control method used by WLAN devices to share the wireless medium. CSMA/CA works by having each station sense the medium before transmitting a frame. If the medium is busy (i.e., another station is transmitting), the station defers its transmission until the medium is idle. If the medium is idle, the station waits for a random backoff period before transmitting. This way, CSMA/CA reduces the chances of collisions and ensures fair access to the medium for all stations. CSMA/CA also uses positive acknowledgements to confirm successful transmissions and retransmissions to recover from errors.
CSMA/CD, DOS prevention, and OFDMA are not used by WLAN devices in a BSS. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 108; [CWNA:
Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 98.
NEW QUESTION # 48
Lynne runs a small hotel, and as a value added service for his customers he has implemented a Wi-Fi hot-spot. Lynne has read news articles about how hackers wait at hot-spots 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. Require EAP-FAST authentication and provide customers with a username/password on their receipt.
- B. Implement an SSL VPN in the WLAN controller that initiates after HTTPS login.
- C. Implement Network Access Control (NAC) and require antivirus and firewall software along with OS patches.
- D. Enable station-to-station traffic blocking by the access points in the hotel.
Answer: D
NEW QUESTION # 49
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CWNP CWNA-108 exam is a rigorous certification that requires candidates to have a deep understanding of wireless networking technologies and their applications. CWNA-108 exam consists of 60 multiple-choice questions, and candidates have 90 minutes to complete it. To pass the exam, candidates must score at least 70%. CWNP Certified Wireless Network Administrator Exam certification is valid for three years, and candidates must renew it by taking the latest version of the exam or earning a higher-level certification.
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