NEW QUESTION 1
VoIP is used heavily in your organization. You must troubleshoot problems with dropped calls on the WLAN.
What is a common cause of dropped calls when using Wi-Fi VoIP phones?

• A. Use of WMM
• B. Data rates below 54 Mbps
• C. Data rates below 75 Mbps
• D. Slow roaming

Answer: D

NEW QUESTION 2
You are attempting to determine timing information within a packet capture of a WLAN protocol analyzer.
What time is used to display the time the packet was captured based on the system clock in the computer?

• A. Relative
• B. Arrival
• C. Interframe
• D. Delta

Answer: B

Explanation:
Arrival Time—This is the time that is assigned to a packet after it is processed by the host system. This timestamp is dependent upon the system clock of the computer, and designates when the packet was captured.

NEW QUESTION 3
You are evaluating a protocol capture file in Wireshark. The following filter is applied: wlan_radio.11ac.bandwidth - - 4
What kind of frames are displayed?

• A. Only 40 MHz frames
• B. Only 80 MHz frames
• C. Only frames supporting 4 spatial streams
• D. Only frames supporting 4 radio chains

Answer: B

NEW QUESTION 4
During an initial install of a controller-based WLAN, the APs are not locating the WLAN controller. The controller is two router hops away from the nearest AP. DHCP is not used. When performing a packet trace, you see a DNS response code of 3 targeted at one of the APs.
What is the problem?

• A. The DNS server is not authoritative for the domain
• B. The router is not forwarding packets to the DNS server
• C. The controller host record has not been created in the DNS server
• D. The authentication to the DNS server failed

Answer: C

NEW QUESTION 5
Given: Protocol analyzer often have useful graphical dashboards providing information about the health and operations of the WLAN.
What is a valid use of a graph showing the Top APs Based on Active Associations?

• A. Ensuring compliance with corporate security policies
• B. Discovering the total number of client STAs on your network
• C. Evaluating the capacity handling on a specific channel
• D. Locating overloaded APs

Answer: D

NEW QUESTION 6
HOTSPOT
A manager at a retail outlet has complained that an incident occurred allowing a STA to launch an attack against another STA connected to their public Wi-Fi hotspot. He has asked you to troubleshoot the situation and verify that all possible measured are being taken to prevent this.
What configuration should you check in the AP?
[MISSING]

• A. Mastered
• B. Not Mastered

Answer: A

NEW QUESTION 7
You are concerned about attackers gaining access to your WLAN from outside the facility.
Why does reducing the output power on the APs not provide sufficient certainty that an attacker outside the facility cannot gain access?

• A. Because RF signals can be received even when weak if using a Mac OS X computer
• B. Because the attacker can simply use high gain antennas
• C. Because the attacker can increase the output power of the radio on the client
• D. Because the attacker will simplify use a lower gain antenna and a radio with higher receive sensitivity

Answer: B

NEW QUESTION 8
A new firmware has been released for the AP model you use in your WLAN. You have more than 120 of these APs installed.
What is a good reason for applying a firmware update on an enterprise AP?

• A. Enable new security features and patch vulnerabilities
• B. Enable 4x4:4 spatial streams on a 3x3:3 AP
• C. Enable the short guard interval
• D. Disable lower data rates

Answer: A

NEW QUESTION 9
You are considering the performance of a BSS based on different PHY types used. In the BSS, one device must use ERP as it does not support HT in its 2.4 GHz band.
What is the duration of the interframe space for this ERP device for standard data frame transmissions?

• A. 10 microseconds
• B. 16 microseconds
• C. 28 microseconds
• D. 9 microseconds

Answer: B

NEW QUESTION 10
iPerf is a tool used in what category of testing?

• A. Configuration
• B. Connection
• C. Name resolution
• D. Throughput

Answer: D

NEW QUESTION 11
You are creating a baseline configuration for a pool of 100 laptops related to Wi-Fi. The laptops have dual-band 802.11ac adapters. They are configured for aggressive roaming.
What additional setting might you configure to ensure they access the WLAN on the channels with the least interference assuming the enterprise WLAN is well-designed?

• A. Band preference
• B. USB speed
• C. 802.11h
• D. Power management

Answer: A

NEW QUESTION 12
When using a commercial WLAN protocol analyzer, you notice that it is listing vendor names for some APs and client STAs.
What is the source of this information?

• A. Broadcast name resolution
• B. Banner grabbing
• C. DNS name resolution
• D. Vendor OUI values

Answer: D

NEW QUESTION 13
You have been asked to recommend a protocol analysis solution that uses open source software and works with the Linux platform. It must provide decoding of 802.11ac frames and minimal support for reporting and statistics.
What solution would you recommend?

• A. Wi-Fi Analyzer Pro
• B. OmniPeek
• C. Wireshark
• D. CommView for Wi-Fi

Answer: C

NEW QUESTION 14
You are analyzing a problem with a specific client adapter. The vendor specifications sheet does not provide detailed information.
What tool can you use to provide the most detailed specification information in many such cases?

• A. WLAN controller
• B. Spectrum analyzer
• C. FCC ID Search
• D. Wi-Fi finder

Answer: C

NEW QUESTION 15
You are troubleshooting throughput problems for a WLAN cell. The cell is provisioned with an 802.11ac dual-band AP. Users connected with both 5 GHz and 2.4 GHz connections are reporting performance problems. The AP settings are properly optimized. No interface issues have been detected (either co-channel interference or non-Wi-Fi interference) and the number of associated users is low.
What should you analyze to resolve the issue?

• A. The 2.4 GHz radio configuration
• B. The antennas used on the client devices
• C. the Ethernet uplink and the network infrastructure
• D. The 5 GHz radio configuration

Answer: C

NEW QUESTION 16
You have implemented centralized, infrastructure-based spectrum analysis. The Aps are configured to perform spectrum analysis in an ad-hoc manner and will go offline as Aps to perform this duty when needed.
What unique method of spectrum analysis monitoring is provided by this solution that is not typically available in a laptop-based analyzer?

• A. Web-based viewing
• B. Real-time FFT
• C. Band selection
• D. RBW adjustments

Answer: D

NEW QUESTION 17
The data rate for a data frame is 150 Mbps in 5 GHz. What rate is used to transmit the PHY header information?

• A. 1 Mbps
• B. 150 Mbps
• C. 75 Mbps
• D. 6 Mbps

Answer: A

NEW QUESTION 18
You require 802.11ac capture solution. You want to capture using native operating system tools if possible.
What operating system has built-in ability to capture 802.11ac frames assuming it is running on the appropriate laptop hardware?

• A. Windows 10
• B. Mac OS X
• C. Windows 7
• D. Windows 8.1

Answer: B

NEW QUESTION 19
You are explaining capacity planning to another engineer assisting you on a WLAN implementation project. As part of the explanation, you provide the following formula: C = B
* log2(1 + S/N).
What does this formula define?

• A. Bandwidth capabilities of a channel
• B. The WEP encryption algorithm
• C. Minimum signal strength for a data rate
• D. Maximum signal strength of a channel

Answer: A

NEW QUESTION 20
ABC Company requires the ability to identify and quickly locate rogue devices. ABC has chosen an overlay WIPS solution with Wi-Fi sensors that use dipole antennas to perform this task. No other sensors are included. Use your knowledge of location tracking techniques to answer the question.
Which one of the following location methods is not available in the described system?

• A. GPS Positioning
• B. Time Difference of Arrival (TDoA)
• C. RF Fingerprinting
• D. Trilateration of RSSI measurements

Answer: C

NEW QUESTION 21
You are tasked with describing the various frames used in 802.11 communications.
What frame is used for spectrum management, fast BSS transition and some other actions taken within a BSA?

• A. BlockAck
• B. CTS
• C. PS Poll
• D. Action

Answer: D

NEW QUESTION 22
When evaluating modulation and coding schemes, you must determine the best coding rate available. In 802.11 MCS tables, what is the best coding rate from the perspective of highest data rates?

• A. 5/6
• B. 3/4
• C. 2/3
• D. 1/2

Answer: A

NEW QUESTION 23
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