EMT Practice Test

1. Question Content...

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Question1: Which one of the following is not a factor considered when calculating the Link Budget for an outdoor point-to-point WLAN bridge link?

Question2: Option 43 must be configured to allow access points to locate controller. In what network service should this option be configured?

Question3: A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss.
If the cable is connected to an antenna with 9 dBi gain, what is the EIRP at the antenna element?

Question4: Which IEEE 802.11 physical layer (PHY) specifications include support for and compatibility with both ERP and HR/DSSS?

Question5: What item is essential for performing a manual RF site survey for a warehouse facility?

Question6: What cipher suite is specified by the 802.11-2016 standard and is not deprecated?

Question7: What statement about the IEEE 802.11e QoS facility is true?

Question8: What cause of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries?

Question9: What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

Question10: What statement about the SSID is true?

Question11: What answer correctly completes the following sentence?
____________ and physical carrier sense functions are used to determine if the wireless medium is busy.

Question12: When an ACK frame is not received by the transmitting STA, what is assumed?

Question13: What statement accurately describes the RF cables and connectors that are used in an
8 02.11 WLAN system?

Question14: What factors will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS?

Question15: 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?

Question16: What wireless networking term describe the increase of RF energy in an intentional direction with the use of an antenna?

Question17: What advantages does using predictive site survey modeling software offer over performing a manual site survey? (Choose 2)

Question18: 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?

Question19: 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)?

Question20: What parameter of the client driver should be configured on a Windows computer to optimize moving from one AP to another within the ESS?

Question21: What is the final step in an effective troubleshooting process?

Question22: What is the most effective method for testing roaming in relation to 802.11 VoIP handsets?

Question23: 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?

Question24: When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

Question25: In an 802.11n 2.4 GHz BSS, what prevents each station from using the full network bandwidth (e.g. 130 Mbps) for user data throughput when multiple clients are actively exchanging data with the AP?

Question26: You are selecting antennas for a WLAN operating in the 5 GHz frequency band. What specifications should be evaluated for an antenna before it is implemented in this WLAN system?

Question27: 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?

Question28: When a client moves to a new BSS within an ESS, what step is a part of the 802.11 reassociation process?

Question29: 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)

Question30: What is a channel mode specified by the 802.11n (High Throughput) PHY?

Question31: An IEEE 802.11 amendment is in the draft state. What impact does this draft amendment have on the 802.11 standard?

Question32: 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?

Question33: What statement about 802.3. Clause 33 Power over Ethernet is true?

Question34: What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

Question35: You are performing a post implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

Question36: The requirement 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 ta likely used that demands these requirements?

Question37: 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?

Question38: An RF signal sometimes bends as it passes through some material other than free space.
What is the term that describe this behavior?

Question39: Lynne runs a small hotel, and as a value added service for her customers she has implemented a Wi-Fi hot-spot. Lynne has read news articles about how hackers wait at hot- spots trying to take advantage of unsuspecting users. She wants to avoid this problem at her hotel.
What is an efficient and practical step that Lynne can take to decrease the likelihood of active attacks on her customers' wireless computers?

Question40: You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-2016 standard, which was not available before the ratification of 802.11ac?

Question41: 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 on their department.
What WLAN feature would allow the network administrator to accomplish this task?

Question42: What best describes WPA2 in relation to 802.11 wireless network?

Question43: A company has hired you to perform a pre-deployment site survey of their facility. During an interview, the network manager informs you that the new wireless network must use 5 GHz bands and OFDM, and VoWiFi handsets will be used extensively over the wireless network.
What items do you need to include in the RF site survey report? (Choose 2)

Question44: 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 for voice over Wi-Fi. what is an action that must be performed?

Question45: Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?

Question46: 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?

Question47: What factors does not influence the distance at which an RF signal can be effectively received?

Question48: What is appended to the end of each 802.11 data frame after the payload?

Question49: What can an impedance mismatch In the RF cables and connectors cause?

Question50: 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?

Question51: You are the network administrator for ABC Company. Your manager has recently attended a wireless security seminar. The seminar speaker taught that a wireless network could be hidden from potential intruders if you disabled the broadcasting of the SSID in Beacons and configured the access points not to respond to Probe Request frames that have a null SSID field.
Your manager suggests implementing these security practices. What response should you give to this suggestion?

Question52: 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?

Question53: 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?

Question54: 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?

Question55: In addition to coverage analysis results, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?

Question56: In WLAN security, which authentication method always create Layer 2 dynamic encryption keys?

Question57: What statement describes the authorization component of a AAA Implementation?

Question58: When implementing PoE, what role is played by a switch?

Question59: What is primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

Question60: What statements about the beamwidth of an RF antenna are true?

Question61: You are reconfiguring an AP to use the short guard Interval. How long will the new guard interval duration be after the change?

Question62: 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 used for access point management. What error in administration could be the cause of this security concern?

Question63: What terms accurately complete the following sentence?
The IEEE 802.11-2012 standard specifies mandatory support of the ___________ cipher suite for Robust Security Network Associations, and optional use of the ___________ cipher suite, which is designed for use with pre-RSNA hardware.

Question64: What standard is referenced into the 802.11-2012 specification and is recommend for robust WLAN client security?

Question65: The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).
What is the center frequency of channel 4?

Question66: What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

Question67: What feature was introduced in the 802.11h amendment in order to uphold regulatory requirements for 5 GHz operations.

Question68: In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

Question69: A dual-band 802-1 lac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?

Question70: An 802.11 based network uses an AP and has several connecting clients. The clients include iPhones, IPads, laptops and one desktop. What WLAN use case is represented?

Question71: You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to 2.4 GHz APs, but it 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?

Question72: 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?

Question73: When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

Question74: You manage a WLAN with 100 802.1lac 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?

Question75: Which one of the following frequency ranges is not specified for use by IEEE 802.11 radios as of 802.11-2012?

Question76: 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 reporting a strong signal, but the users cannot access the Internet. With the problem identified, what is the next logical step in the troubleshooting process?

Question77: 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?

Question78: 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 Moor is -96 dBm. The client is an
802.11ac client and connects to an 802.11ac AP. Both the client and AP are 2x2:2 devices.
What is the likely cause of the low data rate issue?

Question79: Which one of the following channels can be used for VHT transmissions?

Question80: 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?

Question81: You are being interviewed by ABC Company for employment as a wireless site survey expert. The interviewing manager asks you what items should be included in a site survey report generated as part of a manual site survey process.
What answer would be accurate?

Question82: 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 sec the activity that it is generating. What common spectrum analyzer view should you use for this analysis?

Question83: What ID is typically mapped to an AP's MAC address if a single BSS is implemented?

Question84: 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?

Question85: 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?

Question86: Users and Network support personnel at a mid-sized equipment manufacturer have been discussing the potential uses and benefits of implementing an indoor WLAN. The network administrator and network manager have requested a meeting of senior management personnel to discuss a WLAN implementation before performing a site survey or taking any implementation steps. The first topic of discussion in the meeting is the corporate policy concerning implementation and use of WLAN technology.
What specific topics are appropriate in this policy meeting? (Choose 2)

Question87: In a long-distance RF link, what statement about Fade Margin is true?

Question88: ABC Company is planning a point-to-multipoint outdoor 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 as the 802.1X Authenticator?