You are configuring an 802.11ac AP using manual channel planning. The design specification calls for the current AP to be placed on channel 56 in 5 GHz and to disable the 2.4 GHz radio.
For what could the 2.4 GHz radio be used if not standard AP operations?
Response:
You are on site, planning a network at a freight shipping company on a busy harbor. Since the preliminary WLAN design specifies support for the 5
GHz spectrum, you would like to test for radar pulses to determine if DFS channels should be supported at this facility. As a part of your spectral
survey with a laptop-based analyzer, you include DFS testing to identify the presence of radar. This is done by manually observing Real-time FFT,
Duty Cycle, and Active Devices charts of the spectrum analyzer software.
What potential drawback is present with this DFS test method?
What functions may be performed by a WIPS?(Choose all that apply.)
An enterprise customer is subject to the highest standards for network uptime. When designing their wireless network, you should consider which of the following?(Choose all that apply)
Response:
When selecting a centralized WLAN architecture, what new problem may arise when you change the data forwarding model from centralized to distributed?
Response:
For an antenna 35 dBi of gain is needed. What antenna type should be used to achieve this gain?
Response:
Name the audience type not addressed in this chapter for HLDs.
Response:
What are the three biggest WLAN enterprise verticals?(Choose all that apply.)
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When implementing WLAN security according to common best practices, what feature should be enabled when configuring an EAP type?
When doing some frame capturing over the air during a voice call, you realized that frames on the downlink (from the AP to the client) direction are
not being transmitted with the correct UP value for voice frames, but on the uplink (from the client to the AP) direction are being transmitted
correctly. What's the cause of this issue?
Switches and APs have already been chosen by your customer. All switches support 802.3bz MultiGig interfaces and APs are 4x4:4 802.11ac
wave 2 capable of using dual-5GHz and have one MultiGig interface. Some cable drops for the APs will run for more than 180.5 feet (or 55
meters). To support MultiGig, what is the best choice of cabling?
Your new customer is concerned about maintaining privacy for their proprietary information when you conduct information gathering for their
WLAN design. Which document can you use to directly address their concern?
What should always be done before connecting an AP to the production network?
Response:
What are the two most common industry-standard protocols used to transport data from an AP to a Wireless LAN Controller?
What important item is often left out of operational and maintenance plans?
Response:
You are validating association capabilities from clients to an 802.1X/EAP secure SSID. The RADIUS server's IP address is 10.100.50.25 and the
default RADIUS authentication port is used. When testing them, none of the clients are able to associate to the SSID. Troubleshooting the WLAN
infrastructure, you found out that the server is up and the RADIUS service is up as well, but the authenticator is not able to communicate properly
with the server. What's your next troubleshooting step?
What single tool, by design can be used to verify channel selection, encryption in use and number of APs above a specified signal threshold in a given location during deployment?
You are working on a VoWLAN design with your customer's wired networking team. How many distinct priority levels do you expect for the voice
applications?
What basic RF math formula should be used as a baseline to convert an RF value in units of dBm into a value of mW?
*Note: "dBm" in the formulas represents the known dBm value
In addition to a copy of your design, which tools should you use to ensure the installation team deploys APs where you have them designed to be
located?
As an implementation engineer, you have just received initial design specs from a network designer for your dual-band 802.11n deployment. The
network design documents prescribe the following data rate configuration for the 2.4 GHz radio:
Basic Rates 5.5, 6, 11, 12 Mbps
Supported Rates 9, 18, 24, 36, 48, and 54 Mbps as well as MCS 0-15
What will result from this design strategy?
What kind of antenna results in a nearly circular pattern on the azimuth chart but a very flat donut shape on the elevation chart?
What is a valid 40 MHz channel configuration in the 2.4 GHz ISM band where channels 1-11 are permitted?
What term refers to the security practice of obfuscating actual data from unintended receivers as the data crosses the transmission medium?
Response:
Given: A WLAN controller is connected to ABC Company's core layer 3 Ethernet switch with an IEEE 802.1Q trunk connection. The WLAN
controller's native
VLAN is VLAN 6 and its IP address is 10.0.14.2 /24. Lightweight APs supporting centralized forwarding are connected to the network on VLANs 7,
8, and 9, and they each build a Layer 3 tunnel back to the WLAN controller's IP address.
The dynamically assigned IP addresses received by each AP from a DHCP server will be ________________.
Which type of authentication and encryption method is mandatory for Voice Enterprise certified devices as specified by the Wi-Fi Alliance?
In your company’s WLAN, you expect to have a mixed client PHY environment and plan to use protection mechanisms. The protection mechanism used by your client devices is configurable.
What is the best protection mechanism for backward compatibility of 802.11n devices with 802.11b devices?
Response:
When designing a static channel plan for an office using voice devices near an airport, which range of channels should be avoided to ensure
optimal performance when implemented?
What method improves throughput in a low SNR environment?
Response:
SSID hiding is not generally recommended because some frames require inclusion of the SSID. In what frames is the SSID always included?
Response:
An MSA commonly addresses at least which two legal categories?
An organization has chosen to implement Wi-Fi 6E and operates in a regulatory domain allowing the use of all 6 GHz channels. Why can 40 MHz channels be used more easily in this network than one operating in the 5 GHz band?
While performing a validation site survey, you realize that overlapping channels are being used on the 2.4 GHz bad due to the automatic channel assignment algorithm of the WLAN infrastructure.
What should you do to prevent this?
What document is typically created to launch a project?
When troubleshooting coverage issues for a wireless network as it appears to new client associations, you should perform which type of survey?
Response:
What roaming technology uses stored keys at the APs for roam back if a client STA returns after having roamed away?
Response:
Using a SCA means that all APs will be using the same channel in a given layer. How is the AP with which the client associates determined?
What is the primary reason for avoiding 160 MHz channels with 802 11 in the 5 GHz band'?
Of the following antenna connector types, which one is the smallest?
Using a SCA means that all APs will be using the same channel in a given layer. How is the AP with which the client associates determined?
Response:
What are some common problems with short (12 or fewer characters) ASCII passphrases in WPA/WPA2-Personal networks?
Response:
A museum wants to offer Wi-Fi to its visitors. One of their requirements is to have the APs blend into the design of the museum. What should you
do to meet this requirement?
What VoWiFi implementations frequently require multicast packet delivery support by the WLAN infrastructure?
As a device starts to shift to lower PHY rates, what factors usually influence a device decision to shift to lower PHY rates?(Choose all that apply.)
Response:
An amplifier has a 1 dB compression point of 32 dBm and a gain of 20 dB. Which is the highest average input power shown here that would be safe to operate a 24 Mbps 802.11g signal so that spectral regrowth is not a problem?
Response:
When using a predictive design tool, you have selected APs with an antenna gain 3 dBi and set the transmit power of the predicted APs to 25 mW. What should be EIRP of the APs in the design?
Response:
While configuring your site survey software for an upcoming manual survey project, you notice the configuration option for "Network Card
Simulation". What is the purpose of such a feature and when would you use it?
You are site surveying a network for VoWiFi. You have positioned an AP for a manual survey and are moving away from the AP with a phone in
Survey Mode in your hand and you are reading the RSSI value of the signal received from the AP. You have previously determined that the noise
floor was approximately -94 dBm on this floor of the building. The phones documentation does not specify a recommended RSSI or SNR value for
best performance.
Based on the information provided and the type of device (VoWiFi phone) you are deploying, what minimum RSSI should you plan for in all areas
you are monitoring and where VoWiFi service is desired?
Your customer's 802.11n laptops are not able to see the SSID in the 5 GHz band in the conference room. When doing a walkthrough using one of
these laptops, you confirm that it is unable to see the SSID in the 5 GHz band in the conference room. When using your own 802.11 ac laptop,
you're able to see the SSID. What is the most likely cause of this problem?
What type of protection should be provided to outdoor antenna installations?
Response:
Your customer is using PSK as their only authentication. They have an industry requirement to move to a stronger solution. Your recommendation
is to move to a certificate-based type of authentication where both the client and server require certificates. Which EAP type would be the best fit?
While performing a validation site survey, you realize that overlapping channels are being used on the 2.4 GHz bad due to the automatic channel
assignment algorithm of the WLAN infrastructure. What should you do to prevent this?
What is the purpose of Friis transmission equation [ (LdB) = 20 log(d) + 20 log (f) - 27.55 ]?
Given A project parameter defines a requirement or constraint (or a project that can be defined before any file imports or design actions. What is an example of a project parameter commonly available in WLAN design software?
What is the meaning of a Real Time FFT graph?
What are three potential benefits when an organization lets their employees bring their own device onto the company s network"?
Which type of building material causes the most attenuation of Wi-Fi signals'?
What is the most suitable antenna option to be used when designing a WLAN infrastructure with APs mounted on a ceiling with a height of more
than 20 feet and having all of the client stations used from the floor?
Your customer requires fast secure roaming. Which two types of roaming are specified in 802.11-2016 FT roaming that will help meet this goal?
What commonly used item can help lo prevent back pain during lengthy site surveys?
You have determined the best mounting locations for APs in a given installation. The facilities manager has asked you to change the locations for
several APs due to aesthetic concerns. You suggest mounting the APs in the ideal locations and painting them so they go unnoticed in the
environment.
What is a valid recommendation or consideration when painting APs?
Left to its simplest form, what method does a location algorithm use to determine location within a WLAN coverage area?
Response:
During lunch time in the break room of a company, Wi-Fi connectivity on the 2.4 GHz band is intermittent. Every other time of the day, it works fine. What's the likely cause of this issue?
Response:
After designing and deploying a WLAN infrastructure, you realized the CCI is causing poor performance in the 2.4 GHz band. Primarily, you've
designed the
WLAN for 5 GHz and 2.4 GHz as a best effort. You found out that the implementers didn't follow your guidelines when configuring the WLAN
infrastructure. What can you do to minimize as much as possible the CCI impact in the 2.4 GHz band?
When analyzing published competitive tests by equipment vendors, what items are the tests usually lacking?(Choose all that apply.)
Response:
You desire to achieve a 450 Mbps MCS. What 802.11n features (from the numbered list below) are required?
1. Frame aggregation
2. Short GI
3. 40 MHz channels
4. 2 spatial streams
5. 3 spatial streams
6. Transmit beamforming (TxBF)
What is the DSCP Per Hop Behavior equivalent classification of the 802.11 AC_VO priority level?
You deployed an AP and installed its antenna, and you now need to set the AP transmit power. Given a desired EIRP of 21 dBm, and an antenna
gain of 5.85 dBd connected through 25 feet of cable with a loss specification of 4 dB/100 feet.
Assuming that there is no significant loss from the connectors, what should be the transmit power level for this AP?
You and 10 other people are connected to a public hot-spot. You issue a ping sweep on the network, but you can't find any devices on the same
subnet as yours.
What feature might be enabled on the WLAN infrastructure that is preventing you from communicating with other devices on that subnet?
You are creating an outdoor bridge link that spans more than 1000 yards. Which one of the following antenna types is more likely to be included in
the design?
You are testing a VoWLAN deployment, and your communication measurements show a certain amount of lost packets. What would be an
acceptable packet error rate value to still provide acceptable call quality?
After designing a WLAN infrastructure using predictive design software. What's the best way to validate the predictive design in the physical space before deployment, if time and budget allow for it?
How are EAP messages transported over 802.11 wireless LANS?
Response:
An engineering firm just upgraded their WLAN form nine 802.11n APS to nine 802.11ac APs. After this upgrade, they did not see any improvement
in throughput.
What is the most likely cause of this result?
Before performing a pre-deployment passive RF survey of a new deployment using survey mapping software, which of the following must be performed?
You are tasked with designing the WLAN to accommodate certain high density areas on your university campus where users frequently come and
go. With a limited DHCP pool size (subnet mask = 255.255.252.0) for this WLAN subnet, you want to ensure that your DHCP addresses are used
efficiently and are not exhausted, which would prevent new client Layer 3 connections. The DHCP server is a Windows Server 2012 R2 machine.
Your design task is to determine the best configuration to allow as many users as possible while avoiding WLAN service interruptions and also to
use the available addresses as efficiently as possible.
What setting would be most effective at achieving this design task?
ABC Company has a WLAN controller with 10 controller-based APs; the Voice SSID is configured for centralized data forwarding. Each AP is
connected to an access port on a layer-2 Ethernet switch. Each layer-2 switch is uplinked to a single layer-3 core Ethernet switch. The WLAN
controller is connected directly to the layer-3 core Ethernet switch. Layer-3 tunnels are created between all controller-based APs and the WLAN
controller. A voice server is connected to the layer-3
Ethernet switch.
When a voice-enabled QoS STA sends an IP data packet to a voice server in this scenario, the DSCP value carried in the STA's IP data packet gets
mapped to what and by which device?
When performing an indoor predictive site survey to make the WLAN planning and design cycle more efficient, what is a best practice for configuration of the simulated APs in the predictive modeling software?
Response:
In an RSN requiring low-latency reassociations and no fast secure roaming protocols, what security solutions are ideal for protecting VoWiFi communication?(Choose all that apply.)
Response:
While using a USB adapter attached to a USB hub and your laptop for protocol analysts you notice that the SNR is lower than expected. The USB adapter is an 802 11 ac 3x3 3 adapter and is connected to a USB 3 hub. What is likely causing the SNR variation?
When implementing multiple SSIDs to what is each SSID typically mapped in order to provide traffic management separately for each SSID?
Location technology (RTLS) can use which of the following methods?(Choose all that apply.)
Response:
Prior to meeting with the customer for the first time, you should do which of the following?
Response:
A museum wants to offer Wi-Fi to its visitors. One of their requirements is to have the APs blend into the design of the museum. What should you do to meet this requirement?