EMT Practice Test

1. Question Content...

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Question1: What VoWiFi implementations frequently require multicast packet delivery support by the WLAN infrastructure?

Question2: 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?

Question3: When installing APs on high ceilings, what should be the most common PPE to be used?

Question4: You're about to deploy an Enterprise-class VoWLAN infrastructure. You need to ensure that QoS is properly configured throughout the network.
What Access
Category (AC) should voice frames/packets use?

Question5: 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?

Question6: In this question, you will compare the mobility processes of a network that supports WPA2-Personal and WPA2-Enterprise. Assume the use of a
15-character
ASCII passphrase for WPA2-Personal and EAP-TTLS/MSCHAPv2 with WPA2-Enterprise. Also, assume that proprietary roaming protocols are not supported.
When a device transitions from one BSS to another within the same ESS, what step must be performed in the WPA2-Enterprise transition that are not performed in the WPA2-Personal transition?

Question7: 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?

Question8: 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:

Question9: When performing a spectrum analysis walkthrough of a facility tor which you will be creating a WLAN design you detect an interferer What should you do?

Question10: When viewing channel utilization information from a protocol analyzer, if high channel utilization is occurring, what should you ensure does not exist?
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Question11: Given: The 802.11ac APs you have selected for your public access deployment support many of the PHY and MAC enhancements offered by the
802.11n and
802.11ac amendments. The AP is configured for a single-band (2.4 GHz) and only allows 20 MHz channels.
The WLAN radio in the AP is a 3x3
802.11n chip that supports two spatial streams.
What is the maximum MCS rate that could be supported by this AP?

Question12: NicoCo is building a new facility and would like to install a WLAN for primary connectivity of all clients.
The requirements are dual-spectrum 802.11n supporting voice and location tracking.
What type of pre-deployment survey should be performed?
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Question13: When live video streaming solutions that transmit simultaneously to more than one recipient are used, what special capability should be considered and configured in all affected WLAN implementations?

Question14: A designer has created a WLAN design that has been implemented in an organization. The network exists in a four-story building Because each floor has an Identical floor plan, the designer designed only one floor and had the installers duplicate the design on each floor. Now. in validation, it is not performing well What best explains the problem caused by this process?

Question15: What factors are key features when designing a guest network for a large enterprise?(Choose all that apply.) Response:

Question16: 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?

Question17: Before performing a pre-deployment passive RF survey of a new deployment using survey mapping software, which of the following must be performed?

Question18: Left to its simplest form, what method does a location algorithm use to determine location within a WLAN coverage area?
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Question19: What is the meaning of a Real Time FFT graph?

Question20: What is the chip rate of 1 Mbps 802.11b?
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Question21: As you plan a WLAN upgrade, you have assessed the network requirements and data signatures of your applications. One of the popular applications used on your network requires high bandwidth and low to medium Wi-Fi loss, but can tolerate moderate latency and jitter.
What application matches this description?

Question22: What limitation exists when WMM is not enabled on an 802.11n WLAN?
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Question23: You told your customer that multipath fading may be mitigated simply by moving one or both of the receivers antennas a small amount, usually by one to four wavelengths away from its original position. Your customer is prepared to make the change, but does not know the wavelength for
802.11ac.
What is the approximate wavelength of an 802.11ac radio wave?

Question24: During an RFP analysis, one of the vendors mentioned that you'll need to upgrade your Gigabit Ethernet switches to MultiGig switches to ensure support for
802.11ac and 802.11ax, which both offer data rates over 1Gbps. Why is this not sound advice?

Question25: What is the DSCP Per Hop Behavior equivalent classification of the 802.11 AC_VO priority level?

Question26: A table of VLANs in a _________ document should include what device performs ________ services.(Fill in the blanks) Response:

Question27: What type of protection should be provided to outdoor antenna installations?
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Question28: When you see the SKINNY protocol in a post-install validation protocol capture, what does this indicate?

Question29: 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?
Response:

Question30: A controller-based WLAN infrastructure has its controller on a different subnet than its APs. What device must be used to enable any communication between the Controller and the APs?

Question31: What might limit the ability to locate 802.11 clients using a WLAN infrastructure without an 802.11 tag?
(Choose all that apply.)

Question32: Who should be in the final meeting from the customer-side after successfully implementing a WLAN infrastructure?

Question33: Which of the following items could be considered constraints when performing a network design?(Choose all that apply.) Response:

Question34: When selecting a centralized WLAN architecture, what new problem may arise when you change the data forwarding model from centralized to distributed?

Question35: In a convention center, you have received complaints about the WLAN infrastructure. At this moment, the are only two APs in one auditorium.
After analyzing the situation, you determined that there are more client devices that the infrastructure was designed for. There are only two APs to support more than 300 devices using the Wi-Fi at the same time.
What should you do to make the Wi-Fi work as expected?
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Question36: What statement is true of a WLAN design that supports Real-Time Location Services (RTLS) with 802.11 RFID asset tags?

Question37: Which DHCP option, when required, should be configured and enabled to help APs locate their wireless LAN controller?

Question38: What might limit the ability to locate 802.11 clients using a WLAN infrastructure without an 802.11 tag?

Question39: A wireless engineer from your company performed a site survey in an office building where a wireless network extension was needed. He reports that while performing a Layer 1 sweep near a meeting room full of people, he detected RF activity with a very low duty cycle. He is unsure how to interpret what he recorded to determine its impact on a future Wi-Fi network.
What is true about this RF environment and its potential impact on the WLAN?

Question40: What part of the 802.11n preamble is used by the receiver to estimate the spatially multiplexed signal channel? What mode is this used in?
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Question41: 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?

Question42: When designing for a PTP outdoor link, what important consideration should be made about local vegetation?
(Choose all that apply.)
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Question43: 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?
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Question44: Your customer requires a security solution in which client credentials are used and the authentication server must have a certificate with optional client certificate use. Which EAP method would be the best fit for their requirement?

Question45: 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?

Question46: A business traveler from North America is in Europe. The hotel only provides coverage in 2.4 GHz. The traveler connects to the hotel's SSID and notices an AP in the hotel room.
However, the laptop reports a very low RSSI when connected. The traveler does not have the same problem when connecting in the lobby.
What would be the most likely cause of the low RSSI in the hotel room?
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Question47: Of the following antenna connector types, which one is the smallest?

Question48: 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?

Question49: You are planning for client devices in a WLAN that is be upgraded to 802.11ac. Which one of the following devices is more likely to have support for 3x3:3 radios and 256 QAM?
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Question50: During a post-deployment verification, you are requested to troubleshoot an area where users are experiencing poor throughput. They are using data communication only, mainly from laptops. You captured the frame showing an incorrect FCS. This frame is typical of those that were captured by the analyzer.
What does this frame reveal about the RF network in this area?

Question51: What differences exist between VLANs in wireless and wired domains?
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Question52: 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?

Question53: In most WLAN design tools, after defining project parameters or during the project creation wizard what action will you take before you can begin the actual design process?

Question54: What are some common problems with short (12 or fewer characters) ASCII passphrases in WPA/WPA2- Personal networks?
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Question55: 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?
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Question56: For what purpose is SSID hiding generally useful?(Choose all that apply.) Response:

Question57: When creating a long-distance bridge link, it is important to know the channels in use by other networks on both ends of the link and within a reasonable range It is not as Important to know the channels in use in the middle area of the link. Why is this the case?

Question58: What advantage provided by 802.11n and 802.11ac is not usable in 1X1:1 low-end client devices?

Question59: 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:

Question60: Excessive uplink RTP frame retransmissions can result in ____________.
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Question61: In a multiple channel architecture (MCA) network supporting 802.1X authentication, what aspect of WLAN design affects client roaming efficiency and effectiveness?

Question62: If radar has reportedly been detected on your WLAN deployment, what bands would you consider avoiding?
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Question63: What are the three biggest WLAN enterprise verticals?(Choose all that apply.) Response:

Question64: The thermal noise is at 174 dBm/Hz. A spectrum analyzer has a resolution bandwidth of 1 kHz and a 5 dB noise figure. What is the level of the noise floor?
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Question65: Which operational plane would be responsible for performing automated RF management?
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Question66: What is the purpose of a Physical Installation Guide document?

Question67: During a validation site survey, you realize that the installers mounted some of the APs above the ceiling.
They said that this was a request from the building architect due to aesthetics constraints.
During the requirements gathering, you weren't advised about any aesthetics constraints from the main stakeholder of the project. What should you do in this case?
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Question68: What method improves throughput in a low SNR environment?
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Question69: What type of standards-based encryption is used by office extension APs for the traffic tunnel?(Choose all that apply.) Response:

Question70: After importing a floor plan to a predictive design tool, what should be done prior to adding APs, antennas and attenuators (e.g., walls)?

Question71: What document is typically created to launch a project?

Question72: What is the purpose of defining wall materials in WLAN design software?

Question73: 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:

Question74: In a PC-based spectrum analyzer, what data chart identifies the overall RF utilization of a specific frequency in the environment being surveyed?

Question75: What is a typical characteristic of barcode scanners?

Question76: What are the two most common industry-standard protocols used to transport data from an AP to a Wireless LAN Controller?

Question77: 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:

Question78: What action should be taken after implementing a WLAN based on the design developed from the site survey process?

Question79: You are selecting external antennas for use in a bridge link deployment. What chart should you request from the antenna vendors to make an accurate selection?

Question80: Which one of the following might be detected as a source of CCI during a post-validation survey in the 5 GHz band?

Question81: Given: A WLAN controller is connected to ABC Company's core layer 3 Ethernet switch with an IEEE 802.1 Q 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 ________________.

Question82: A customer wants to deploy a WLAN that employs centralized forwarding. What LAN requirements should you look for?
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Question83: 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?
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Question84: What is a radome?

Question85: 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?

Question86: What functions may be performed by a WIPS?(Choose all that apply.)
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Question87: During a validation site survey, you realize that the installers mounted some of the APs above the ceiling.
They said that this was a request from
the building architect due to aesthetics constraints. During the requirements gathering, you weren't advised about any aesthetics constraints from the main stakeholder of the project. What should you do in this case?

Question88: What are methods of providing RF high availability?
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Question89: One of your customers plans on providing wireless coverage to a warehouse facility. After performing an initial walkthrough, you collect the following information:
The central part of the warehouse is between 400 and 600 feet (122 to 183 meters) from the warehouse switches mounted on the walls.
The warehouse storage is composed of metallic racks with varying inventory levels and contents, from electronics and plastic toys to food pallets and juice bottles.
Workers need basic data coverage from their working location, and are not highly mobile. They usually work from one single aisle, and their laptop is on a cart with wheels.
What would be your one recommendation to provide coverage to the central area of the warehouse?

Question90: What is the purpose of DHCP Option 43, and how is it used with WLANs?

Question91: During a customer walkthrough you notice an area of the CAD drawing where it is not accurate. What next step should you take?
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Question92: When troubleshooting coverage issues for a wireless network as it appears to new client associations, you should perform which type of survey?
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Question93: What best describes ensuring coverage requirements in a deployed WLAN?

Question94: You must perform a site survey that defines signal strength, throughput and latency What kind of survey should you perform?

Question95: The installation crew for your WLAN project wants to install a few APs to locations nearby the ones specified in the RF design document. What next step should occur?
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Question96: You have enabled IEEE 80211 FT in your WLAN infrastructure. You want to verify roaming between APs (two at a time) and determine If all of your end-points are capable of performing fast roaming What tool would you use to achieve this goal?

Question97: 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?

Question98: Which one of the following is an essential metric to measure when performing a survey and design for VoIP across WLANs?

Question99: What are some significant drawbacks that are present with WPA/WPA2-Enterprise that are not present with WPA/WPA2-Personal?(Choose all that apply.) Response:

Question100: 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.)

Question101: In high-density environments, such as stadiums and convention centers, what extra factor has to be taken into account that can attenuate Wi-Fi signals when these environments are having an event?

Question102: What document can be useful when determining client capabilities in a WLAN design project?

Question103: Which definition correctly describes the "local MAC" variation of the centralized WLAN architecture?

Question104: For an antenna 35 dBi of gain is needed. What antenna type should be used to achieve this gain?
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Question105: What frequency and power did 802.11y provide?
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Question106: Given: In a site survey deliverable report, you are expected to explain the spectrum measurements taken at the customers site. What portion of a spectrum analyzer view can be used to determine if a given channel is too active for use as the active channel for a new AP?

Question107: What commonly used item can help lo prevent back pain during lengthy site surveys?

Question108: A WLAN that you designed has been deployed in one area, users ate complaining that the network performs poorly. When you analyze the area you see that a new interferer has been introduced that was not there during the pre-design survey You've been informed that the interferer cannot be removed as it is an essential loT device. What action do you recommend?

Question109: In the enterprise, when is WPA/WPA2-Personal generally a recommended solution?(Choose all that apply.) Response:

Question110: What inexpensive tool is capable of locating neighbor WLANs if that is your only need?

Question111: SSID hiding is not generally recommended because some frames require inclusion of the SSID. In what frames is the SSID always included?
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Question112: A business traveler from North America is in Europe. The hotel only provides coverage in 2.4 GHz. The traveler connects to the hotel's SSID and notices an AP in the hotel room. However, the laptop reports a very low RSSI when connected. The traveler does not have the same problem when connecting in the lobby. What would be the most likely cause of the low RSSI in the hotel room?

Question113: To ensure that your design meets the requirements of the WLAN, what should be defined in your WLAN design software that will result in different requirements at varying locations on the floor plan1?

Question114: 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?

Question115: What kind of site survey helps you identify if roaming is working as designed?

Question116: 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?

Question117: 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?

Question118: You are designing a WLAN and nave been asked to recommend a security solution for the network The organization requires that 802 1X/EAP be implemented, but they do not have a PKI and do not wish to deploy one They suggest that mostly Windows clients. Apple phones and Android phones will be used What do you recommend?

Question119: 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?

Question120: Aesthetics are very important in some environments. What common installation technique can be used to best meet this requirement in a stadium?

Question121: When a WLAN controller sends an 802.11 frame to a lightweight AP for transmission on the wireless medium, how does it mark the frame for
802.11 QoS priority?

Question122: 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)

Question123: In what circumstance would you not enable DFS channels on a WLAN infrastructure?

Question124: Given: You are evaluating the theoretical and real-world RF gain benefits of transmit and receive features introduced by 802.11 with MIMO. This exercise allows you to quantify the features value in a real-world environment.
What is the maximum theoretical signal gain of chip-based TxBF and MRC (as features) when compared to the same AP using only a single antenna for transmit and receive (effectively simulating a 1x1 chip)?

Question125: A cable with 2.5 dB of loss is used to measure the return loss of an antenna. The measured value in-band is shown to be larger than 20 dB. What is the actual return loss of the antenna, and is it considered to be a reasonable value?
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Question126: 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?
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Question127: What statements are true regarding jitter and latency?(Choose all that apply.) Response:

Question128: What are the deliverables to your customer after successfully implementing a WLAN infrastructure?

Question129: What is an advantage of centralized data forwarding?