EMT Practice Test

1. Question Content...

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Question1: What is the final step in an effective troubleshooting process?

Question2: You are troubleshooting a WLAN problem and you suspect hidden node as the cause.
What should you look for in a protocol analyzers?

Question3: You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?

Question4: A standard PoE injector is use to power an access point requiring 802.3at. CAT6 cabling is in use. What is the maximum distance supported between the access point and the Ethernet switch with the use of a midspan power injector?

Question5: You are troubleshooting a controller-based AP that is unable to locate the controller. DHCP is not use and the controller is located at 10.10.10.81/24 while the AP is on the
10.10.16.0/24 network. What should be inspected to verify proper configuration?

Question6: What is a channel mode specified by the 802.11n (High Throughput) PHY?

Question7: Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?

Question8: What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

Question9: In a long-distance RF link, which statement about Fade Margin is true?

Question10: When using a spectrum to look for non Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a users workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?

Question11: When an ACK frame is not received by the transmitting STA, what is assumed?

Question12: A string of characters and digits is entered into an AP and a client STA for WPA2 security.
The string is 8 characters long. What is this string called?

Question13: Lynne runs a small hotel, and as a value added for his customers he has implemented a Wi-Fi hot-spot. Lynne has read news articles about how hackers wait at hots-pots trying to take advantage of unsuspecting users. He wants to avoid this problem at his hotel.
What is an efficient and practical step that Lynne can take to decrease the likelihood of active attacks on his customers' wireless computers?

Question14: You are using a tool that allows you to see signal strength for all APs in the area with a visual representation. It shows you SSIDs available and the security settings for each SSID. It allows you to filter by frequency band to see only 2.4 GHz networks or only 5 GHz networks. No additional features are available. What kind of application is described?

Question15: You are tasked with performing a throughput test on the WLAN. The manager asks that you use open source tools to reduce costs. What open source tool is designed to perform a throughput test?

Question16: What can an impedance mismatch in the RF cables and connectors cause?

Question17: A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following methods is commonly used to locate the controllers by the APs?

Question18: You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?

Question19: What answer correctly completes the following sentence?
____________ and physical carrier sense functions are used to determine if the wireless medium is busy.

Question20: You are deploying a WLAN with the access points configured for 10 mW of output power on the 2.4 GHz radios and 20mW of output power on the 5GHz radios. Some semi- directional antennas are also in use. What kind of deployment is described?

Question21: You are troubleshooting a problem with interference from a non-802.11 device. Given that the device is not a WLAN device, you cannot use a protocol analyzer and have chosen to use a spectrum analyzer. You want to view the signal from the interfering device over time to see the activity that is generating.
What common spectrum analyzer view should you use for this analysis?

Question22: What advantages does using predictive site survey modeling software offer over performing a manual site survey? (Choose 2)

Question23: Your consulting firm has recently been hired to complete a site survey for a company. Your engineers use predictive modeling software for surveying, but the company insists on a pre-deployment site visit.
What task should be performed as part of the pre-deployment visit to prepare for a predictive survey?

Question24: The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The user indicate that they need more throughput and all stations are 5 GHz capable 802.11ac clients. The current AP configuration uses 20 MHz channels in both 2.4 GHz and 5 GHz. What is the least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended?

Question25: What best describes WPA2 in relation to 802.11 wireless networks?

Question26: You support a WLAN using dual- band 802.11ac three stream access points. All access points have both the 2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 2.4 GHz. A manager is concerned about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios. What do you tell him?

Question27: The IEEE 802.11-2012 standard requires VHT capable devices to be backward compatible with devices using which other 802.11 physical layer specification (PHY)?

Question28: To ease user complexity, your company has implemented a single SSID for all employees.
However, the network administrator needs a way to control the network resources that can be accessed by each employee based in their department.

Question29: ABC Company is planning a point-to-multipoint bridge deployment with standalone (autonomous) 802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.11X Authenticator?

Question30: You have been tasked with creating a wireless link between two buildings on a single campus. The link must support at least 150 Mbps data rates. What kind of WLAN technology role should you deploy?

Question31: When considering data rates available in HT and VHT PJY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?

Question32: The requirements for a WLAN you are installing state that it must support unidirectional delays of less than 150 ms and the signal strength at all receivers can be no lower than -67 dBm. What application is likely used that demands these requirements?

Question33: You administer a small WLAN with nine access point. As a small business, you do not rum a RADIUS server and use WPA2-Personal for security. Recently, you changed the passphrase for WPA2-personal in all Aps and clients. Several users are now reporting the inability to connect to the network at time and it is constrained to one area of the building.
When using scanner, you see that the AP covering that area is online

Question34: An RF sigma sometimes bends as it passes through some material other than free space.
What is the term that describes this behavior?

Question35: In a mesh BSS (MBSS), according to the 802.11-2016 standard, what device connect the mesh to an Ethernet network?

Question36: In WLAN security, which authentication method always create Layer 2 dynamic encryption keys?

Question37: You are implementing a multi-AP WLAN and fast secure roaming is essential. Which one of the following methods is an IEEE 802.11 standard method for fast roaming?

Question38: You are troubleshooting an issue reported by several wireless user. The problem is contained to one cell (several users connected to the same AP. You manage the WLAN and no other network devices/ After analysis it appear to be a switch problem. What action should be taken?

Question39: What statement describes the authorization component of a AAA implementation?

Question40: You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of this connection?

Question41: During a post-implementation survey, you have detected a non-802.11 wireless device transmitting in the area used by handheld 802.11g scanners. What is the most important factor in determining the impact of this non-802.11 device?

Question42: Which one of the following channels can be used for VHT transmissions?

Question43: A client STA must choose the best AP for connectivity. As part of the evaluation, it must verify compatible data rates. What can the client STA use to verify that an AP supports the same data rates that it supports?

Question44: You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you document yoy findings, what term do you use to describe the problem in this configuration?

Question45: What statement about the SSID is true?

Question46: What parameter of the client driver should be configured on a Windows computer to optimize moving from one AP to another within the ESS?

Question47: What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

Question48: What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?

Question49: You are deploying a WLAN monitoring solution that utilizes distributed sensor devices.
Where should sensors be deployed for best results? Choose the single best answer.

Question50: What feature was introduced in the 802.11h amendment in order to uphold regulatory requirements for 5 GHz operations.

Question51: You are attempting to explain RF shadow and how it can cause lack of coverage. What common building item frequently causes RF shadow and must be accounted for in coverage plans?

Question52: A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?

Question53: Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even when the two APs are operating on non-overlapping channels (e.g. 1 & 6).
What deployment flaw could cause this problem?

Question54: A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-
802.11 device?

Question55: Your manager asked you to locate a solution that allows for centralized monitoring of WLAN performance over time. He wants a single pane of glass for administration and monitoring of the solution. What do you recommend?

Question56: As you prepare for a site survey in a multi-floor corporate office, you have learned about several wireless devices that support connection-oriented, real-time applications. These applications are sensitive to service interruptions and require excellent signal quality, low latency, and low loss. For that reason, it is important to identify sources of RF interference as well as building characteristics that would cause RF blockage or dead spots.
What systems or environmental characteristics are most likely to cause interference or RF blockage and disrupt service for these applications? (Choose 2)

Question57: What common feature of MDM solutions can be used to protect enterprise data on mobile devices?

Question58: You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-2016 standard that was not available before the ratification of 802.11 ac?

Question59: You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to 2.4 GHz APs, but is does not even see 5 GHz APs. While evaluating the issue, you determine that this problem is happening for all of the laptops of this model in the organization. Several other tablets connect on channel 48 and channel 52 in the same work areas. What is the likely problem?

Question60: When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

Question61: Which one of the following is not a factor considered when calculating the Link Budget for an outdoor point-to-point WLAN bridge link?

Question62: ABC Company has thousands of Wi-Fi users accessing their network on a daily basis.
Their WLAN consists of 700 access points, 6 WLAN controllers, and a wireless network management system.
What network functions are performed by the enterprise-class WNMS?

Question63: You are installing AP to be used by 23 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?

Question64: What statement about the beamwidth of an RF antenna is true?

Question65: What Linux shell command can be used to view the hardware and PHY capabilities of a wireless adapter in detail including channel widths, output power setting, channels supported, and more?

Question66: When antenna gain is reported in dBI, the gain of the antenna is compared to what theoretical antenna?

Question67: What item is essential for performing a manual RF site survey for a warehouse facility?

Question68: Which one of the following 802.11 PHYs is more likely to be used in an industrial deployment but not likely to be used in standard office deployments?

Question69: You have received a report of poor wireless connections on the third floor of a building under your administration. Three individuals have reported the problem. Apparently, the connections are reposting a strong signal, but the users cannot access the Internet. With the problem identified, what is the next logical step in the troubleshooting process?