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NEW QUESTION 1
You are performing 802.3 network analysis. For what are the DA and SA fields used in the frame header?
- A. Defining either direct access or sourced access
- B. Defining the addresses sending and receiving the frame
- C. Defining either distance access routing or strict access routing
- D. They are not used; addresses are only used in the 802.11 header
Answer: B
NEW QUESTION 2
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 3
You are working in an organization that has implemented an SCA-based WLAN. You want to change the RF channel for a single AP.
What can you do to perform this task with some SCA solutions?
- A. Access the AP using SSH and change the channel
- B. Access the AP through the console port and change the channel
- C. Access the AP using Telnet and change the channel
- D. Convert the network to MCA
Answer: D
NEW QUESTION 4
Several users have reported WLAN network connection issues and the users connect to the same AP. These users are spread throughout a 320 square meter area. Using a spectrum analyzer, you see RF energy across the entire 2.4 GHz band at significant signal strength levels. The users all connect using either HT or ERP devices.
What is the likely cause of this problem within this area?
- A. Wide-band jammer
- B. Microwave oven
- C. Bluetooth devices
- D. Video camera
Answer: A
NEW QUESTION 5
You are troubleshooting a connection problem with a client STA. Regardless of the AP to which it attempts to connect, the connection fails. Using a wired protocol analyzer, you determine that the problem is with the 802.1X/EAP authentication to the RADIUS server.
What layer or range of layers of the OSI model revealed this information?
- A. Layer 3
- B. Layer 2
- C. Below Layer 3
- D. Above Layer 4
Answer: A
NEW QUESTION 6
You have captured 802.11 traffic using an adapter that includes the radio tap header. You see several frames often called announcement frames in the capture.
What best describes these types of frames?
- A. They only include beacon and probe request frames
- B. They are used to allow a STA to awake from sleep and for no other reason
- C. They only include beacon and probe response frames
- D. They are meant to provide information to the network that may result in state changes, but they are not open for rejection
Answer: C
NEW QUESTION 7
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 8
When using Wireshark for protocol analysis, what filter will allow you to see only beacon frames?
- A. wlan.fc.type_subtype = =0x05
- B. wlan.fc.type_subtype = =0x0b
- C. wlan.fc.type_subtype = =0x08
- D. wlan.fc.type_subtype = =0x04
Answer: C
NEW QUESTION 9
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 10
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 11
What element was added to the general frame of 802.11 with the 802.11e amendment and the 802.11-2007 rollup?
- A. HT Control
- B. Address 4
- C. QoS Control
- D. RSN-IE
Answer: C
NEW QUESTION 12
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 13
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 14
You must report on frame types seen on the WLAN. You want to list the frame types by both name and binary value.
What frame type is represented by the binary value 011010, which includes the Type and Subtype values?
- A. Beacon
- B. PS-Poll
- C. Authentication
- D. Association Request
Answer: B
NEW QUESTION 15
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 16
The To DS bit is set to 0 and the From DS is set to 1. What best describes this 802.11 frame?
- A. A frame being transmitted from an AP to a client STA
- B. A frame being transmitted in a mesh BSS
- C. A frame being transmitted from a client STA to an AP
- D. A frame being transmitted directly from one client STA to another
Answer: A
NEW QUESTION 17
The manager in the security group is concerned about compliance with security policies on the WLAN. The budget is not available for a full WIPS SOLUTION. He has asked you to implement a process that will verify compliance.
What would you recommend in such a scenario?
- A. Use the built-in spectrum analyzer features of the APs to ensure that WPA2-Enterprise is implemented throughout the organization
- B. Simplify enable 802.11w, which will enforce management frame compliance
- C. Use a laptop-based protocol analyzer that provides compliance reporting to monitor the environment on a periodic basis
- D. Implement AP-based sensors throughout the facility and then monitor for performance issues with these sensors
Answer: C
NEW QUESTION 18
Given: Adjacent Channel Interference (ACI) can cause frame corruption and poor performance in WLANs. You are using a protocol analyzer in the attempt to detect ACI.
What should you look for in such a scenario?
- A. Look at Retry counts
- B. Capture on the channel you think may be impacted by ACI and see if any frames are captured from adjacent channels
- C. Look for frames with a low signal strength value in the radio tap header
- D. Look at CRC errors
Answer: B
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