EMT Practice Test

1. Question Content...

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Question1: As XYZ Company's wireless specialist, you have been asked to troubleshoot some unexpected frame patterns in a wireless protocol capture. Your peers explain that the network's beacon frames are inconsistent. That is, the BSSID is the same for all beacons, but the source address varies between three different addresses.
What network configuration would cause this beacon frame behavior?

Question2: In an 802.11n 2.4 GHz BSS, what prevents each station from using the full network data rate (e.g. 216.7 Mbps) for user data when multiple clients are actively exchanging data with the AP?

Question3: You are evaluating access points for use in the 5GHz frequency band.
What PHY supports this band and supports 80 MHz channels?

Question4: 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?

Question5: What features are most often configurable within 802.11 WLAN client utilities? (Choose 2)

Question6: When performing a validation survey for a Multiple Channel Architecture (MCA) system in a multi- tenant building with five floors, what aspect should you, as the surveyor, keep in mind?

Question7: What is the final step in an effective troubleshooting process?

Question8: You are planning for PoE in a standard office deployment. Which one of these devices is least likely to be a PoE PD?

Question9: What factor will have the most significant impact on the amount of wireless throughput available to each station within a BSS?

Question10: You administer a WLAN that offers a guest SSID of GUESTNWORK. User connect to the GUESTNWORK SSID, but report that they cannot browse the internet. The devices simply report no internet connection. What common problem causes this scenario?

Question11: 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?

Question12: An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss.
The cable is connected to an antenna with 16 dBi of gain.
What is the EIRP power output?

Question13: 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?

Question14: 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?

Question15: 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?

Question16: AP-1 is a 3x3:2 AP. STA-3 is a 3x3:3 client. What is the maximum number of spatial streams that can be used for a downlink HT-OFDM transmission from AP-1 to STA-3?

Question17: 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?

Question18: 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?

Question19: 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?

Question20: Option 43 must be configured to allow access points to locate controller. In what network service should this option be configured?

Question21: 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?

Question22: 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?

Question23: 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?

Question24: What is primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

Question25: 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?

Question26: You are performing a post implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

Question27: 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?

Question28: What statement about the SSID is true?

Question29: You are reporting on the RF environment in you facility. The manager asks you do describe the noise floor noted in the report. Which of the following is the best explanation?

Question30: You are troubleshooting an issue reported by several wireless users. 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 appears to be a switch problem. What action should be taken?

Question31: In an 802.11n WLAN with a heterogeneous set of associated client devices including 802.11b,
11g, and 11n, what HT protection mode will the BSS use?

Question32: In a long-distance RF link, what statement about Fade Margin is true?

Question33: 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?

Question34: What standard is referenced into the 802.11-2012 specification and is recommend for robust WLAN client security?

Question35: In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

Question36: ABC Company has just purchased a 6 dBi patch antenna. After performing some tests with the 6 dBi antenna, they have concluded that more antenna gain is needed to cover their outdoor courtyard. When choosing an antenna with higher gain, what other antenna characteristic will also always change?

Question37: As a consultant, you've been hired by XYZ Company to provide recommendations about client device selection, operation, and interoperability. What information should be considered to help them choose the right WLAN client devices?

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 best describes WPA2 in relation to 802.11 wireless network?

Question40: What factors will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS?

Question41: What statement about 802.3. Clause 33 Power over Ethernet is true?

Question42: Prior to association, what parameter can 802.11 client devices measure and use to select the optimal access point for association?

Question43: What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?

Question44: XYZ Company has decided to install an 802.11 WLAN system that will support 1000 wireless users, but they are concerned about network security. XYZ is interested in deploying standardized security features. In addition to WPA2-Enterprise with PEAP and role-based access control, XYZ would like to support management frame protection as well as a fast secure roaming protocol for future mobile handsets.
As XYZ Company selects a product to deploy, what two IEEE amendments, which are included in
802.11- 2016, should be supported to provide the management frame protection and fast secure roaming security features?

Question45: What is an advantage of using WPA2-Personal instead of WEP-128 as a security solution for
802.11 networks?

Question46: When antenna gain is reported in dBI, the gain of the antenna is compared to what theoretical antenna?

Question47: What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

Question48: What item is essential for performing a manual RF site survey for a warehouse facility?

Question49: In a Wi-Fi client configuration utility, what feature is most likely to be user configurable?

Question50: Which one of the following frequency ranges is not specified for use by IEEE 802.11 radios as of
802.11-2012?

Question51: 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?

Question52: 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)

Question53: When a STA has authenticated to an AP (AP-1), but still maintains a connection with another AP (AP-2), what is the state of the STA on AP-1?

Question54: In an infrastructure Basic Service Set (BSS), how does the passive scanning process occur?

Question55: 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?

Question56: Which unit of measurement is an absolute unit that is used to quantify received signal power levels on a logarithmic scale?

Question57: 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?