EMT Practice Test

1. Question Content...

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Question1: ABC Company is planning to install a new 802.11ac WLAN, but wants to upgrade its wired infrastructure
first to provide the best user experience possible. ABC Company has hired you to perform the RF site
survey. During the interview with the network manager, you are told that the new Ethernet edge switches
will support VoIP phones and 802.11 access points, both using 802.3 PoE.
After hearing this information, what immediate concerns do you note?

Question2: You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of
this connection?

Question3: What fact is true regarding controllers and Aps in a split-MAC architecture?

Question4: What wireless networking term describes the increase of RF energy in an intentional direction with the use
of an antenna?

Question5: You are performing a post-implementation validation survey. What basic tool can be used to easily locate
areas of high co-channel interference?

Question6: In a mesh BSS (MBSS), according to the 802.11-2016 standard, what device connects the mesh to an
Ethernet network?

Question7: In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

Question8: 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?

Question9: In which plane of the three networking planes is an access point configured by a WLAN controller?

Question10: 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?

Question11: 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?

Question12: 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?

Question13: In addition to coverage analysis result, what should be included in a post-deployment site survey report to
ensure WLAN users experience acceptable performance?

Question14: In a long-distance RF link, which statement about Fade Margin is true?

Question15: What security solution is deprecated in the 802.11 standard and should never be used in any modern
WLAN deployment?

Question16: An RF signal sometimes bends as it passes through some material other than free space. What is the term
that describes this behavior?

Question17: 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?

Question18: When implementing PoE, what role is played by a switch?

Question19: 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?

Question20: 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?

Question21: 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?

Question22: What statement about the beamwidth of an RF antenna is true?

Question23: 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?

Question24: Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP
and HR/DSSS?

Question25: 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?

Question26: 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?

Question27: What terms accurately complete the following sentence?
The IEEE 802.11-2016 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 and is deprecated.

Question28: 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?

Question29: What can an impedance mismatch in the RF cables and connectors cause?

Question30: Return Loss is the decrease of forward energy in a system when some of the power is being reflected
back toward the transmitter.
What will cause high return loss in an RF transmission system, including the radio, cables, connectors and
antenna?

Question31: What statement about 802.11 WLAN performance is true?

Question32: What non-standard WLAN solution attempts to give a longer transmission windows to devices with higher
data rates than devices with lower data rates?

Question33: 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?

Question34: You are attempting to explain RF shadow and how it can cause lack of coverage. What common building
item frequently causes RF shadow and must be accounted for in coverage plans?

Question35: Option 43 must be configured to allow access points to locate controllers. In what network service should
this option be configured?

Question36: 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?

Question37: What statement about 802.11 WLAN bridges is true?

Question38: What is an advantage of using WPA2-Personal instead of WEP-128 as a security solution for 802.11
networks?

Question39: 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?

Question40: What is appended to the end of each 802.11 data frame after the payload?

Question41: Which one of the following is not a factor considered when calculating the Link Budget for an outdoor
point-to-point WLAN bridge link?

Question42: 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?

Question43: 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?

Question44: When replacing the antenna of a WLAN device with a similar antenna type that has a higher passive gain,
what antenna characteristic will decrease?

Question45: You are evaluating access points for use in the 5 GHZ frequency band. What PHY supports this band and
supports 80 MHz channels?

Question46: You are configuring an access point to use channel 128. What important fact should be considered about
this channel?

Question47: 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?

Question48: 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?

Question49: 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?

Question50: What statement about 802.3, Clause 33 Power over Ethernet is true?

Question51: You are installing an AP to be used by 23 laptops. All laptops will connect on the 5 GHz frequency band. A
neighbor network uses channels 1 and 6. What channel should be used for this AP and why?

Question52: What is the final step in an effective troubleshooting process?

Question53: You are reporting on the RF environment in your facility. The manager asks you do describe the noise
floor noted on the report. Which of the following is the best explanation?

Question54: 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?

Question55: What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the
same BSSID but with different source addresses?

Question56: 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?

Question57: You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you
look for in a protocol analyzer?

Question58: 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?

Question59: 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?

Question60: 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?

Question61: What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by
broadcast video signals?

Question62: You administer a small WLAN with nine access points. As a small business, you do not run a RADIUS
server and use WPA2-Personal for security. Recently, you changed the passphrase for WPA2-Personal in
all APs and clients. Several users are now reporting the inability to connect to the network at times and it is
constrained to one area of the building. When using a WLAN scanner, you see that the AP covering that
area is online and has a strong signal. No other changes have been made to the environment and all
access points are the same model. What is the likely problem?

Question63: 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?

Question64: When antenna gain is reported in dBI, the gain of the antenna is compared to what theoretical antenna?

Question65: You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to
your 2.4 GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz
SSIDs, which are different than the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with
no difficulty. What is the likely problem?

Question66: 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?

Question67: What ID is typically mapped to an AP's MAC address if a single BSS is implemented?

Question68: What best describes WPA2 in relation to 802.11 wireless networks?

Question69: 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?

Question70: 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?

Question71: You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly
overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you
document your findings, what term do you use to describe the problem in this configuration?

Question72: What factor does not influence the distance at which an RF signal can be effectively received?