NEW QUESTION NO: 20
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 frames supporting 4 spatial streams
B. Only frames supporting 4 radio chains
C. Only 40 MHz frames
D. Only 80 MHz frames
Answer: D

NEW QUESTION NO: 21
Recently, three rogue APs have been connected to the network and later discovered. You want to prevent future rogue AP installations as much as possible.
What is the first step to eliminating or reducing rogue APs on the network?
A. Define a direct policy that stipulates the ramifications of installing unauthorized devices
B. Enable rogue detection in the existing authorized APs
C. Create a hash of the MAC addresses of all authorized devices and continually scan for non-matching hashes
D. Use IPSec between every AP and the network infrastructure
Answer: B

NEW QUESTION NO: 22
You want to simplify viewing frames of a particular type in Wireshark.
What is used to specify frames for colorization?
A. Custom code must be written and the binaries recompiled
B. Automated protocol analysis is used and no additional options may be specified
C. Filters are used to define the frames that should be colorized
D. A scripting language is available to modify the code before recompilation
Answer: C
Explanation/Reference:
Explanation:
Protocol analyzers also support highlighting or colorization and filtering. The highlighting feature allows you to define colors for packets or frames matching particular criteria. It allows those frames to stand out as you browse through the captured frames

NEW QUESTION NO: 23
What action is taken automatically by 802.11 APs and client STAs as the signal strength of the link weakens in order to improve the quality of the RF communications overall?
A. RSSI is increased
B. Antenna gain is increased
C. Data rates are reduced
D. Output power is increased
Answer: C

NEW QUESTION NO: 24
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 authentication to the DNS server failed
B. The controller host record has not been created in the DNS server
C. The router is not forwarding packets to the DNS server
D. The DNS server is not authoritative for the domain
Answer: B

NEW QUESTION NO: 25
You are concerned with management overhead in your WLAN. When evaluating the network, you note that each dual-band AP provides for 4 SSIDs in each band with three secure SSIDs and one Open System SSID. The network runs only 802.11ac APs and uses 20 MHz channels in 2.4 GHz and 400 MHz channels in 5 GHz.
What can you do to reduce the impact of beacon frames on CCI and channel utilization?
A. Use only 40 MHz channels
B. Use the same security across all SSIDs
C. Increase the beacon interval
D. Disable SSID broadcasting
Answer: D

NEW QUESTION NO: 26
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
Explanation/Reference:
Reference: http://semiengineering.com/a-primer-for-the-802-xx-physical-layer/

NEW QUESTION NO: 27
You have been recently hired as the wireless network administrator for an organization spread across seven locations. They have deployed more than 100 APs, but they have not been managed in either an automated or manual process for more than 18 months.
Given this length of time, what is one of the first things you should evaluate from a support perspective?
A. The VLANs in use
B. The data rates allowed
C. The firmware revision
D. The channels in use
Answer: C

NEW QUESTION NO: 28
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. 28 microseconds
B. 16 microseconds
C. 9 microseconds
D. 10 microseconds
Answer: B

NEW QUESTION NO: 29
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 CRC errors
B. Look at Retry counts
C. Look for frames with a low signal strength value in the radio tap header
D. Capture on the channel you think may be impacted by ACI and see if any frames are captured from adjacent channels
Answer: D

NEW QUESTION NO: 30
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. Locating overloaded APs
B. Discovering the total number of client STAs on your network
C. Evaluating the capacity handling on a specific channel
D. Ensuring compliance with corporate security policies
Answer: A

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