EMT Practice Test

1. Question Content...

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Question1: You are planning for PoE in a standard office deployment. Which one of these devices is least likely to be a PoE PD?

Question2: What statement about the IEEE 802.11-2016 QoS facility is true?

Question3: Which one of the following frequency ranges is not specified for use by IEEE 802.11 radios as of 802.11-2012?

Question4: In a mesh BSS (MBSS), according to the 802.11-2016 standard, what device connect the mesh to an Ethernet network?

Question5: 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?

Question6: 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?

Question7: You were previously onsite at XYZ's facility to conduct a pre-deployment RF site survey.
The WLAN has been deployed according to your recommendations and you are onsite again to perform, a post-deployment validation survey.
When performing this type of post-deployment RF site survey voice over Wi-Fi, what is an action that must be performed?

Question8: Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere each other when they transmit frames. Assuming no other Aps are in the vicinity, is CCI still a possibility in this network and why?

Question9: 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?

Question10: 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?

Question11: You are onsite with a client to perform a post-deployment site survey. When verifying a multiple channel VoWiFi deployment using a VoWiFi handset, which aspect is most important?

Question12: You are troubleshooting a WLAN problem and you suspect hidden node as the cause.
What should you look for in a protocol analyzers?

Question13: 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?

Question14: 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?

Question15: Which one of the following channels can be used for VHT transmissions?

Question16: What statement about 802.11 WLAN performance is true?

Question17: 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?

Question18: What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

Question19: 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?

Question20: When implementing PoE, what role is played by a switch?

Question21: You are using a site survey tool for post-implementation validation. You have installed the appropriate adapter driver and imported a floor plan. Now, you want to take the next step in proper tool use. What must you do before gathering survey data after the floor plan is imported?

Question22: You are managing a wireless access point in autonomous mode using the Web based interface. You capture traffic during this management task and notice that you can see the HTML code of the Web pages for access point management. What error in administration could be the cause of the security concern?

Question23: In addition to coverage analysis result, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?

Question24: In a long-distance RF link, which statement about Fade Margin is true?

Question25: You are performing a post implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

Question26: You are evaluating access points for use in the 5GHz frequency band. What PHY supports this band and supports 80 MHz channels?

Question27: What factor does not influence the distance at which an RF signal can be effectively received?

Question28: What non-standard WLAN solution attempts to give a longer transmission windows to devices with higher data rates then devise with lower data rates?

Question29: 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?

Question30: What common feature of MDM solutions can be used to protect enterprise data on mobile devices?

Question31: 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?

Question32: You are troubleshooting a client problem with a 2.4 GHz WLAN connection. The client is experiencing surprisingly low data rates during the work day. You analyze the workspace outside of business hours and detect a strong signal with a typical noise floor at the client location. During working hours, the user works with a laptop in the area and uses an external USB hard drive for continuous data access. The user also states that the laptop works as expected on her home network. The user working approximately 8 feet away from this client experiences no problems.
Based on this information, what is the likely cause of the problem?

Question33: 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?

Question34: What factor is likely to cause the least impact on the application layer throughput of an
802.11n client station in a 2.4 GHz HT BSS?

Question35: 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?

Question36: What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

Question37: What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?

Question38: You are evaluating access points for use in the 5GHz frequency band. What PHY supports this band and supports 80 MHz channels?

Question39: 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?

Question40: 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.

Question41: A client complains of low data rates on his computer. When you evaluate the situation, you see that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an
802.11ac client and connects to an 802.11acAP. Both the client and AP are 2x2:2 devices.
What is the likely cause of the low data rate issue?

Question42: In WLAN security, which authentication method always create Layer 2 dynamic encryption keys?

Question43: What best describes WPA2 in relation to 802.11 wireless networks?

Question44: 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?

Question45: What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

Question46: What is a channel mode specified by the 802.11n (High Throughput) PHY?

Question47: What parameter of the client driver should be configured on a Windows computer to optimize moving from one AP to another within the ESS?

Question48: What advantages does using predictive site survey modeling software offer over performing a manual site survey? (Choose 2)

Question49: 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?

Question50: 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)