EMT Practice Test

1. Question Content...

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Question1: 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?

Question2: What kind of site survey helps you identify if roaming is working as designed?

Question3: After importing a floor plan to a predictive design tool, what should be done prior to adding APs, antennas and attenuators (e.g., walls)?

Question4: What is a valid 40 MHz channel configuration in the 2.4 GHz ISM band where channels 1-11 are permitted?

Question5: 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?

Question6: 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?

Question7: When performing an active site survey in an existing WLAN infrastructure, in addition to gathering throughput data, what other important function will you typically be testing at the same time?

Question8: 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?

Question9: 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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Question10: 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?

Question11: 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?

Question12: 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?

Question13: In a large enterprise (5000+ wireless users), by what would NOT be a recommended method by which IP addresses and VLANs are assigned to different clients associated to the same AP?

Question14: 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?

Question15: What operational plane would a WNMS primarily interact with?
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Question16: 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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Question17: To increase capacity in a coverage-based wireless network, which of the following techniques are typically recommended?(Choose all that apply.) Response:

Question18: 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?

Question19: 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?

Question20: HR/DSSS specifies the following PHY rates:
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Question21: 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?
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Question22: 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?
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Question23: In a multiple channel architecture (MCA) network supporting 802.1X authentication, what aspect of WLAN design affects client roaming efficiency and effectiveness?

Question24: You're preparing to perform a site survey for a company that processes meat. Some areas are restricted due to high-security. What do you have to do in order to proceed with the site survey?

Question25: During a post-validation assessment, you have configured a client for 802.1X/EAP but it is not passing authentication. Which areas should you check in the WLAN configuration?
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Question26: You have initiated a site survey to be performed and the team has been onsite and is halfway through gathering the necessary data.
The project sponsor just asked you to make sure the WLAN supports radio frequency identification (RFID) location tracking. How would you possibly characterize this situation?
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Question27: Looking at a client radio specification sheet that states Receive Sensitivity of 82 dBm @ 18 Mbps would mean:
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Question28: Given: As the wireless network administrator for XYZ Company, you are planning to upgrade your aging wireless network infrastructure, as well as some clients, to support 802.11ac.
In your research, you have discovered that your new wireless client devices and infrastructure are 802.11ac, WMM, and WMM-PS certified by the Wi-Fi Alliance. Some of your existing client devices are 802.11a/b/g devices that do not support WMM.
Given this information, what scenario is possible when your company's employees begin using both types of client devices on the new WLAN?
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Question29: A bandpass filter has a maximum in-band loss of 1.5 dB, ripple of 0.4 dB, and a return loss of 15 dB. What is the minimum in-band loss?
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Question30: For what purpose is SSID hiding generally useful?(Choose all that apply.) Response:

Question31: 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?
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Question32: For what types of systems should you request read-only access to in order to perform an analysis of the customer's existing infrastructure?(Choose all that apply.) Response:

Question33: How are EAP messages transported over 802.11 wireless LANS?
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Question34: Four buildings are located in a square orientation to each other. Fisch Stix Food Company is requesting a PtMP link between the buildings. On the building with the root bridge link, what type of antenna is the best choice?
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Question35: 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?

Question36: When installing APs on high ceilings, what should be the most common PPE to be used?

Question37: A table of VLANs in a _________ document should include what device performs ________ services.(Fill in the blanks) Response:

Question38: What is the chip rate of 1 Mbps 802.11b?
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Question39: What should always be done before connecting an AP to the production network?
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Question40: If radar has reportedly been detected on your WLAN deployment, what bands would you consider avoiding?
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Question41: 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?

Question42: When surveying an existing WLAN infrastructure for a possible redesign, you use two Wi-Fi USB adapters to collect RSSI data and two USB spectrum analysis adapters to collect RF spectrum data. Since your laptop doesn't have enough USB ports, you use a 4-port powered USB 3.0 hub.
What issues could be caused by the use of USB 3.0 that will impact your site survey?

Question43: When analyzing published competitive tests by equipment vendors, what items are the tests usually lacking?(Choose all that apply.) Response:

Question44: 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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Question45: 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?

Question46: Which definition correctly describes the "local MAC" variation of the centralized WLAN architecture?

Question47: When preparing a floor plan graphic for use in predictive and manual site surveying, what calibration method will lead to the most accurate and reliable RF data?

Question48: 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?

Question49: You performed a site survey with two USB Wi-Fi adapters using a special driver written for the site survey software. After deployment, you realized that the client devices used by your customer are getting lower RSSI values than that shown during your site survey. What is the most likely reason for this result?

Question50: What is the purpose of DHCP Option 43, and how is it used with WLANs?

Question51: 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?

Question52: 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?

Question53: What limitation exists when WMM is not enabled on an 802.11n WLAN?

Question54: 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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Question55: 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?

Question56: What differences exist between VLANs in wireless and wired domains?
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Question57: What functions may be performed by a WIPS?(Choose all that apply.)
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Question58: What limitation exists when WMM is not enabled on an 802.11n WLAN?
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Question59: What action should be taken after implementing a WLAN based on the design developed from the site survey process?

Question60: 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?

Question61: Who should be in the final meeting from the customer-side after successfully implementing a WLAN infrastructure?

Question62: 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?

Question63: A wireless network with fewer APs at higher power levels to cover a large area is said to be which of the following?
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Question64: What roaming technology uses stored keys at the APs for roam back if a client STA returns after having roamed away?
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Question65: 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?

Question66: 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:

Question67: 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?

Question68: 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?

Question69: 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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Question70: What statements are true regarding jitter and latency?(Choose all that apply.) Response:

Question71: What factors are key features when designing a guest network for a large enterprise?(Choose all that apply.) Response:

Question72: What commonly causes a client-to-AP link imbalance?

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.)

Question74: 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?

Question75: 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?

Question76: Assume that your network operates in a regulatory domain that allows use of the entire 5 GHz space allowed in the 802.11ac amendment. In your upcoming
802.11ac deployment, you would like to take advantage of the performance improvements that result from channel bonding. However, after extensive testing, you have determined that your mission-critical WLAN should not use channels requiring DFS support.
Given those two criteria (enable channel bonding and disable DFS channels), in the 5 GHz spectrum, how many non-overlapping 40 MHz channels will your system be able to use?

Question77: You have been tasked with performing safety and operations training for outdoor bridge link installation. The antennas are to be installed on a 70-foot tower on one end and the roof top of an office building on the other end.
What might be required for the tower installation?
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Question78: You are using site software design features. You have imported a floor plan, but the simulated RF coverage is nowhere close to the real RF coverage you see with a walkabout.
Given that the simulation is significantly different, when step was likely missed when using the software?
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Question79: What strategy can be used to ensure efficient cell overlap for VoIP site surveys?
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Question80: What are the deliverables to your customer after successfully implementing a WLAN infrastructure?

Question81: What is the minimum PoE budget needed on a switch to support 6 (six) APs that can only be powered using IEEE 802.3at if no other details are provided?

Question82: What might limit the ability to locate 802.11 clients using a WLAN infrastructure without an 802.11 tag?

Question83: When installing a cloud-based AP, what is the most common process used?
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Question84: Modulation can be defined as:
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Question85: How much more power can a 1 Mbps 802.11b signal have than a 54 Mbps 802.11g signal if it is sent through a saturated amplifier?
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Question86: In what circumstance would you not enable DFS channels on a WLAN infrastructure?

Question87: An MSA commonly addresses at least which two legal categories?

Question88: 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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Question89: 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?

Question90: What functions do the control plane of centralized and distributed WLAN architectures help solve?(Choose all that apply.) Response:

Question91: 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?

Question92: 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?

Question93: 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 ________________.

Question94: 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?

Question95: 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?

Question96: What advantage provided by 802.11n and 802.11ac is not usable in 1X1:1 low-end client devices?

Question97: What is the minimum PoE budget needed on a switch to support 6 (six) APs that can only be powered using IEEE 802.3at if no other details are provided?
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Question98: What is the best method of gathering attenuation measurements from any building materials or objects?

Question99: When implementing WLAN security according to common best practices, what feature should be enabled when configuring an EAP type?

Question100: 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?

Question101: Which operational plane would be responsible for performing automated RF management?
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Question102: 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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Question103: 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?

Question104: When you see the SKINNY protocol in a post-install validation protocol capture, what does this indicate?

Question105: What is the most cost-effective way to accurately measure the height of a ceiling when ladder use is not allowed?

Question106: What is the meaning of a Real Time FFT graph?

Question107: A customer is acquiring a new VoWLAN system to replace their existing wired phone system. When reading about his system's requirements, you learned that is requires 25 db of SNR to work as expected. After surveying the environment, you discovered that the noise floor is -88 dBm. What should be the minimum RSSI value to meet the system's requirements?

Question108: 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?

Question109: 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?

Question110: Which of the following items could be considered constraints when performing a network design?(Choose all that apply.) Response:

Question111: 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?

Question112: What VoWiFi implementations frequently require multicast packet delivery support by the WLAN infrastructure?