EMT Practice Test

1. Question Content...

---

Question1: What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?

Question2: What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

Question3: 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?

Question4: What statement about 802.11 WLAN bridges is true?

Question5: Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

Question6: What is appended to the end of each 802.11 data frame after the payload?

Question7: When implementing PoE, what role is played by a switch?

Question8: What common feature of MDM solutions can be used to protect enterprise data on mobile devices?

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 settings, channels supported, and more?

Question10: 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.
What WLAN feature would allow the network administrator to accomplish this task?

Question11: What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

Question12: 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 with each other when they transmit frames. Assuming no other APs are in the vicinity, is CCI still a possibility in this network and why?

Question13: 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?

Question14: A standard PoE injector is used 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?

Question15: You are planning for PoE in a standard office deployment. Which one of these devices is least likely to be a PoE PD?

Question16: 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?

Question17: In which plane of the three networking planes is an access point configured by a WLAN controller?

Question18: The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The users 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?

Question19: When antenna gain is reported in dBI, the gain of the antenna is compared to what theoretical antenna?

Question20: 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?

Question21: What statement describes the authorization component of a AAA implementation?

Question22: In WLAN security, what authentication method always creates Layer 2 dynamic encryption keys?

Question23: When considering data rates available in HT and VHT PHY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?

Question24: 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?

Question25: 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?

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 5 GHz and 20 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: You are performing a post implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

Question28: You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?

Question29: You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of this connection?

Question30: 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?

Question31: What is the most effective method of testing roaming in relation to 802.11 VoIP handsets?

Question32: 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?

Question33: 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?

Question34: When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

Question35: What ID is typically mapped to an AP's MAC address if a single BSS is implemented?

Question36: You are troubleshooting a controller-based AP that is unable to locate the controller. DHCP is not used 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?

Question37: What statement about the IEEE 802.11-2016 QoS facility is true?

Question38: What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?

Question39: Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?

Question40: A string of characters and digits is entered into an AP a client STA for WPA2 security. The string is 8 characters long. What is this string called?

Question41: 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?

Question42: 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?

Question43: You are configuring an access point to use channel 128. What important fact should be considered about this channel?

Question44: 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?

Question45: What statement about 802.11 WLAN performance is true?

Question46: What non-standard WLAN solution attempts to give a longer transmission windows to devices with higher data rates than devices with lower data rates?

Question47: 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?

Question48: What statement about 802.3, Clause 33 Power over Ethernet is true?

Question49: 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?

Question50: What cipher suite is specified by the 802.11-2016 standard and is not deprecated?

Question51: What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?

Question52: When an ACK frame is not received by the transmitting STA, what is assumed?

Question53: What security method is commonly used for VoIP handsets when the infrastructure does not support OKC or FT roaming?

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

Question55: 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?

Question56: A natural disaster has occurred in a remote area that is approximately 40 miles from the response team headquarters. The response team must setup a local wireless network using 802.11 WLAN access points.
What is the best method, of those listed, for implementation of a network backhaul for communications across the Internet in this scenario?

Question57: 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?

Question58: You administer a WLAN that offers a guest SSID of GUESTNWORK. Users 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?

Question59: In a mesh BSS (MBSS), according to the 802.11-2016 standard, what device connects the mesh to an Ethernet network?

Question60: 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?

Question61: When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?