EMT Practice Test

1. Question Content...

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Question1: 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?

Question2: Lynne runs a small hotel, and as a value added for his customers he has implemented a Wi-Fi hotspot.
Lynne has read news articles about how hackers wait at hotspots 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?

Question3: When implementing PoE, what role is played by a switch?

Question4: 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 9dBi gain, what is the EIRP at the antenna element?

Question5: Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?

Question6: Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?

Question7: 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?

Question8: 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?

Question9: What can an impedance mismatch in the RF cables and connectors cause?

Question10: An IEEE 802.11 amendment is in the daft state. What impact does this draft amendment have on the
802.11 standard?

Question11: What wireless networking term describes the increase of RF energy in an intentional direction with the use of an antenna?

Question12: What ID is typically mapped to an AP's MAC address if a single BSS is implemented?

Question13: What statement describes the authorization component of a AAA implementation?

Question14: 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 disable 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?

Question15: 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?

Question16: When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

Question17: What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

Question18: An RF sigma sometimes bends as it passes through some material other than free space. What is the term that describes this behavior?

Question19: What statement about the IEEE 802.11-2016 QoS facility is true?

Question20: 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?

Question21: 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.

Question22: 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?

Question23: 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?

Question24: 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?

Question25: What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

Question26: What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

Question27: What cipher suite is specified by the 802.11-2016 standard and is not deprecated?

Question28: 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?

Question29: 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?

Question30: 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?

Question31: When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

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: 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?

Question34: 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?

Question35: 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?

Question36: What is the final step in an effective troubleshooting process?

Question37: When an ACK frame is not received by the transmitting STA, what is assumed?

Question38: 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?

Question39: What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

Question40: 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?

Question41: What best describes WPA2 in relation to 802.11 wireless networks?

Question42: 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?

Question43: What factor does not influence the distance at which an RF signal can be effectively received?

Question44: 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?

Question45: You are performing a post implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

Question46: In addition to coverage analysis result, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?

Question47: 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?

Question48: 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?

Question49: 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?

Question50: What is appended to the end of each 802.11 data frame after the payload?

Question51: What statement about the beamwidth of an RF antenna is true?

Question52: What statement about 802.3, Clause 33 Power over Ethernet is true?

Question53: You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?

Question54: In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

Question55: 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?

Question56: Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

Question57: Which one of the following is not a factor considered when calculating the Link Budget for an outdoor point-to-point WLAN bridge link?

Question58: In a long-distance RF link, which statement about Fade Margin is true?

Question59: 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?

Question60: What is the most effective method of testing roaming in relation to 802.11 VoIP handsets?