itsp215/itsp216
A basic service set identifier (BSSID) is the unique identifying MAC address of the ____________. A. AP radio B. AP Ethernet port C. Router D. Client
A. AP radio
Powered amplifiers provide an increase in signal strength by using ____________ gain. A. Active B. Passive C. Positive D. Maximum
A. Active Active gain requires an external power source to provide an increase in signal strength. An amplifier is an example of a device that uses active gain. Antennas provide an increase in strength by using passive gain.
The IEEE 802.11 association process happens after which phase? A. Authentication B. Distribution C. Deauthentication D. Reauthentication
A. Authentication
Given: A customer has recently purchased an 802.11g access point that accepts multiple external antennas. The customer wants to know if they need to purchase multiple antennas or a single antenna for the AP. What do you tell them is a benefit of using multiple antennas?
Transmit and receive diversity that addresses multipath problems.
What two devices use RF to communicate?
Transmitter Receiver
Given: ABC Company has asked you to recommend a solution that will provide wireless connectivity for dektop computers at various locations in their warehouse. The locations of the desktop computers prevent the use of Cat5e cabling. What type of client adpater would provide WiFi connectivity to these desktop computers?
USB 2.0
As a new salesperson for ABC Company's Golden Gate division, you are tasked with selling WiFi equipment. While evaluating the manufacturer's sepcifications for a specific WiFi device, you read that this device supports 802.1X/EAP. What capability does this feature provide?
User Identity validation
Given: In order to reduce travel-related expenses, your CFO has enacted a company policy that eliminates cellular data connectivity for traveling users. Many of your users must connect to the office network during travel, but you have security concersn about wireless hot-spot usage. To address these concerns, what advice should you give to your traveling users with regard to wireless hot-spot usage?
Verify that personal firewall and antivirus software are both enabled before connecting, Always use company-provided VPN client software after connecting to the WiFi network
Which are absolute measurements of RF Power
Watt and mW
The range of a 2.4 GHz signal is mostly dependent on which RF characteristic?
Wavelength
As an alternative to using leased lines to connect two offices on the same campus, your customer wants to implement a WiFi solution. When asked by your customer, what advantages do you cite regarding use of a WiFi infrastructure instead of a leased line?
WiFi implementations have a lower total cost of ownership than leased lines, WiFi implementations offer more flexibility and easier expansion than leased lines.
Which two channels are considered non-overlapping in the 2.4 GHz band
1, 6
How many channels are available for wireless LAN use in the unlicensed middle UNII-2e band
11
How many channels are available for wireless LAN use in the unlicensed 2.4GHz ISM band?
14
WiFi certified network devices can operate in what frequency band(s)?
2.4 GHz and 5 GHz
an 802.11b channel is how wide in MHz
22 MHz
In the 2.4 GHz range, what distance between the center frequencies is required to be considered non-overlapping for HR/DSSS?
25 MHz
802.11a operates in the _______ GHz frquency ranges and uses the ______- frequency bands.
5, UNII
An independent basic service set (IBSS) consists of how many access points? A. 0 B. 1 C. 2 D. 4
A. 0
Which items describe a service set identifier (SSID)? (Choose two.) A. 32 characters maximum B. 64 characters maximum C. Is case sensitive D. Is not case sensitive
A. 32 characters maximum C. Is case sensitive
As a device moves away from an access point, which of the following is true regarding dynamic rate switching? A. Data rate decreases B. Output power decreases C. Data rate increases D. Output power increases
A. Data rate decreases
An IEEE 802.11g access point requires a minimum of how many antennas to move data? A. One B. Two C. Four D. Six
A. One 802.11g access points require only one antenna to function. Systems that support antenna diversity will require two antennas to correctly operate.
According to the IEEE 802.11 standard, an extended service set (ESS) consists of how many interconnected basic service sets? A. One or more B. Two or more C. Three or more D. Four or more
A. One or more
Horizontal beamwidth is ____________ to the earth's surface. A. Parallel B. Perpendicular C. Positive D. Negative
A. Parallel Horizontal beamwidth is parallel to the earth's surface. This is based on how the E-field propagates away from the antenna element. Vertical beamwidth is perpendicular to the earth's surface.
RF line of sight is required for which type of IEEE 802.11 WLAN installation? (Choose two.) A. Point-to-point B. Scattered C. Point-to-multipoint D. Reflected E. Refracted
A. Point-to-point C. Point-to-multipoint Point-to-point and point-to-multipoint both require RF line of sight to be able to effectively communicate. Scattering, reflection, and refraction are all behaviors of RF.
You are a network engineer troubleshooting a WLAN weak signal complaint. While moving a handheld WLAN device, you notice that the signal strength increases when the device is moved from a horizontal to a vertical position. This is because the ____________is changing. A. Polarization B. Wavelength C. Frequency D. Diffusion
A. Polarization Changing the orientation of a device or antenna will change the polarization and affect the received signal strength. The signal strength may either increase or decrease depending on how the polarization is changed from the original position. Wavelength, frequency, and phase are characteristics of RF.
In order to set up an ad hoc network, a user must know which two parameters? (Choose two.) A. SSID B. BSSID C. Channel D. MAC address E. Protection mode
A. SSID C. Channel
A patch antenna is an example of which type of antenna? A. Semidirectional B. Omnidirectional C. Highly directional D. Dipole-directional
A. Semidirectional A patch antenna provides semidirectional coverage. The amount of coverage depends on the design and gain of the antenna. Parabolic dishes are highly directional.
In what situation is an RF site survey LEAST needed?
Telecommuters using a single "remote AP" at home
Two characteristics of RF signals are?
Amplitude and Phase
After installing a wireless client adapter into a laptop computer, what software is required to use the adapter and to configure it to connect to a WiFi network?
Client Utility, Device Driver
As a salesperson, you have been contacted by an automobile dealership that currently manages each of their 5 SOHO-class access points individually. The owner of the dealership contracts his nephew for the dealership's network administration, but the nephew admits to a limited knowledge of WLAN technology. The dealership owner and his nephew want you to advise them on how they can simplify the management of their wireless network. You tell them that they are currently managing _______ access points, and they could consider ________ to ease the management burden.
Autonomous; a WLAN controller-based architecture
The curvature of the earth will have an impact on the WLAN signal after how many miles? A. 2 B. 7 C. 10 D. 25
B. 7 The curvature of the earth or earth bulge will have an impact on a WLAN signal after seven miles. If the signal needs to travel farther than seven miles, the antenna will have to be installed in a higher location.
802.11a access points support which antenna technology to help reduce the effects of multipath? A. Adjustable gain B. Antenna diversity C. Adjustable polarization D. Antenna multiplexing
B. Antenna diversity 802.11a access points can use antenna diversity. Gain and polarization are considered RF concepts.
A basic service set (BSS) consists of how many access points? A. Zero B. At least one C. At least two D. At least four
B. At least one
In order for a wireless client to become completely part of the basic service set, it must first ____________ and ____________ then. A. Associate, authenticate B. Authenticate, associate C. Deauthenticate, authenticate D. Disassociate, authenticate
B. Authenticate, associate
An azimuth chart shows which RF radiation pattern? A. Vertical B. Horizontal C. Positive D. Negative
B. Horizontal The horizontal RF radiation pattern of an antenna is displayed using an azimuth chart. The vertical radiation pattern is displayed using an elevation chart.
When an IEEE 802.11g WLAN consists only of wireless client stations, the network is operating as which type of basic service set? A. Active B. Independent C. Passive D. Infrastructure
B. Independent
What device is used to shunt transient current to ground in the event of an indirect lightning strike? A. Lightning striker B. Lightning arrestor C. Lightning prevention D. Lightning breaker
B. Lightning arrestor A lightning arrestor is used to protect a WLAN system from an indirect lightning strike. A lightning arrestor will direct transient or induced electrical current to earth ground as a result of a lightning strike.
You are a technical support engineer and receive a call from a customer regarding a problem with their wireless network connection. The building has an ESS network with five 802.11ac access points. The customer claims that when they move from their office to a conference room using the 802.11ac network they lose their connection and cannot connect to the access point in the conference room. Which is the most likely cause for this user to lose their connection when they roam on the wireless network? A. Different RF channel B. Mismatched SSID C. Different BSSID D. Mismatched association
B. Mismatched SSID
Antennas provide an increase in RF coverage by using ____________ gain. A. Active B. Passive C. Positive D. Maximum
B. Passive Antennas provide an increase in RF coverage by means of passive gain. Passive gain occurs when isotropic RF energy is focused into a specific radiation pattern. Active gain requires the use of an external power source.
When a WLAN device listens for beacon frames, it is participating in which phase? A. Power save B. Passive scanning C. Active scanning D. Authentication
B. Passive scanning
The process in which a WLAN client connection moves from one access point to another is called ____________. A. Reauthentication B. Roaming C. Rebuilding D. Roving
B. Roaming
The open system authentication process uses how many frames? A. One B. Two C. Three D. Four
B. Two
IEEE 802.11a/b/g access points require ____________ antennas on each radio for diversity functionality. A. One B. Two C. Three D. Six
B. Two An IEEE 802.11a or IEEE 802.11b/g access point will require two antennas for diversity. Although there are two antennas, a single input/single output access point will have only one radio. The access point provides additional intelligence to determine which antenna to use. Other WLAN technologies, such as IEEE 802.11ac MIMO, may use multiple antennas.
When implementing a wireless LAN, what is the area covered by an AP and usable by a client station called?
Basic Service Area
The two most common modes of WLAN discovery are passive scanning, where a client station listens for _______ frames, and active scanning, where a client sends and receives ________ frames.
Beacon; Probe
After your city implemented a municiapl WIFI network using 802.11g on channels 1, 6, and 11 near your office, your users have been complaining about poor performance on their 802.11b VoWifi phones. The best solution for optimizing your 802.11a/g network to support VoWiFi in this scenario is to _________
Buy new 5 GHz capable VoWiFi phones
A service set identifier (SSID) has a maximum limit of how many characters or octets? A. 8 B. 16 C. 32 D. 128
C. 32
Wireless network cables and devices have impedance (AC resistance) of ____________ ohms. A. 10 B. 25 C. 50 D. 75
C. 50 WLAN cables and devices are rated at 50 ohms impedance. Cable and satellite television is rated at 75 ohms.
WLAN devices in an 802.11a peer-to-peer network will connect to which device(s)? A. An access point B. 802.11g client devices C. 802.11a client devices D. A wireless switch
C. 802.11a client devices
You are a technical support engineer and provide help desk support for the network in a manufacturing company. You receive a call from the sales manager who wants to know how power save operations should be set up on her notebook computer to optimize the system performance. The notebook computer is plugged into an AC power source and rarely used on battery. Which mode would you recommend her to set on the wireless adapter? A. Power save mode B. Association mode C. Active mode D. Passive mode
C. Active mode
Which can cause a loss of signal strength? (Choose two.) A. Antenna B. Amplifier C. Cable D. Connector E. Transmitter
C. Cable D. Connector Cables and connectors can both result in a loss of signal strength. Antennas and amplifiers will add gain or increase signal strength. A transmitter outputs an absolute amount of power.
You are a sales engineer connected to an IEEE 802.11ac access point with a mobile computer. As you move away from the access point, the connection speed slows to the next lowest supported data rate. The change in data rate is described by which term? A. Dynamic frequency selection B. Transmit power control C. Dynamic rate switching D. Transmit save mode
C. Dynamic rate switching
You are a help desk support technician at a retail department store, and you receive a call from a manager in the administrative offices. He complains that the performance of his 802.11g/n notebook computer decreases several times throughout the day. Upon visiting the customer, you realize several people are performing inventory using 802.11b barcode scanners in the adjacent room. What is most likely the cause of the poor performance for the manager's notebook computer? A. Association B. Authentication C. ERP protection D. HT protection
C. ERP protection
Highly directional antennas are typically used for ____________ connectivity. A. Short-range B. Omnidirectional C. Long-range D. Dipole
C. Long-range Highly directional antennas are typically used for long-range point-to-point connectivity, such as bridge links. Omnidirectional antennas are used as part of an access point system or to provide point-to-multipoint links.
A beacon frame advertises information about the wireless network. A beacon frame is what type of frame? A. Data B. Control C. Management D. Detail
C. Management
Which weather element would commonly have an effect on a WLAN system? A. Rain B. Snow C. Wind D. Hail
C. Wind Of the answers listed, wind would have the biggest impact on a WLAN system. Rain, snow, and hail do not affect wireless transmission unless the weather is severe. In this case, the collection of the elements may have an impact on the WLAN signal transmitted or received.
Given: In Single-Channel Architecture (SCA) systems multiple access points can use the same BSSID. This feature allows for the creation of a network-wide virtual access point that can be applied across multiple physical access points operating on the same channel.
Client stations do not have to make roaming decisions
Omnidirectional antennas have a horizontal beamwidth ____________ of degrees. A. 90 B. 180 C. 270 D. 360
D. 360 Omnidirectional antennas have a horizontal beamwidth of 360°. The vertical beamwidth will vary depending on the design and the gain of the antenna.
A point-to-point wireless link requires what percent of the Fresnel zone to be clear in order to be considered to have an acceptable RF line of sight? A. 0 B. 20 C. 40 D. 60
D. 60 It is recommended that at least 60 percent of the Fresnel zone be free of obstruction in order to have acceptable RF line of sight. Up to 40 percent of the zone can be blocked by obstructions without affecting the signal.
What layer of the OSI reference model is responsible for data framing for a given physical layer technology?
Data Link
What unit of measurement is used to measure the power difference between two RF signals?
Decibel
When RF passes or bends around an obstacle like building or column, the behavior is ?
Diffraction
ABC Company would like to provide WiFi coverage to the are highlighted on the floorplan in the exhibit. If mounted at location-A, what type of antenna would provide a coverage pattern similar to the highlighted area?
Diversity Patch
ABC Corporation has decided to deploy their first WiFi netowrk in their corporate headquarters. ABC prepared for adding a WiFi network by installing PoE-capable Ethernet switches in their wiring closets. What type of PoE implementation is this?
Endpoint
VPN solutions are often used in conjunction with WIFi networks for what purpose?
Endpoint secuirty for traveling users connected to unsecure WiFi hot-spots
View the figures and correctly identify the antenna types illustrated in the figures.
Figure 1: Parabolic Dish Figure 2: Grid
How many channels are available for wireless LANs to use in the unlicensed UNII-1 band
Four
What is the term defining the amount of times a cycle of an RF signal will oscillate in one second
Frequency
What two factors are used to calculate the wavelength of an RF wave?
Frequency, Speed of light
The amplitude of an RF signal is:
Height
Given: Several users are required to transfer files among themselves in a conference room. No APs are availbale for connections to the network infrastructure. All users have laptops with 802.11 wireless adapters installed and operational. What can you implement to allow users to transfer files when 802.11 adapters are available, but no wireless LAN infrastructure is accessible?
IBSS
Manufacturers design hardware used for wireless LANs based on a common set of criteria or rules known as standards. The name of the organization responsible for creating 802.11 WLAN standards is what?
IEEE
How many non-overlapping channels are available in the unlicensed 2.4 GHz ISM band?
THREE
What is a difference between an Infrastructure Basic Service Set (BSS) network and an Ad Hoc network?
In a BSS, an access point is used for connectivity to the wired network infrastructure. In an Ad Hoc network, client stations communicate directly with each other
What statement accurately descibes an advantage of manual RF site surveys over predictive site surverys?
Manual site surverys are useful for locating and identifying sources of RF interference while predictive site surveys are not capable of this task
As an RF signal propagates, it reflects off an object. The reflected signal and the signal following a direct path arrive at the receiver at different points in time. What is the term used to describe this RF behavior?
Multipath
As a general rule, where is the most appropriate location to install a dipole antenna?
Near the center of the coverage area
In order to assess your customer's WiFi network needs, you have arranged an initial meeting with your customer's representatives and your systems engineer. So that you can request cooperation and input from all stakeholders, which individuals from your customer's company should you invite to this functional requirements meeting?
Network Administrator, Facilities manager
The Capacity of an access point is dependent upon which two factors?
Number of Users Software Applications
Which item has an effect on RF line of sight?
Obstacles
Which WiFi vertical market applications are regulated by a government or industry group for security compliance?
Patient records in hospitals, Consumer payment information in retail stores
Which scenario represents an improper installiation for an AP with low-gain omnidirectional antennas?
Place above the doorway, at one end of a long hallway
A software-based site survey tool sold by your company allows your customers to determine access point coverage and optimum placement within a facility without visiting the facility. What is the term that most accurately describes this type of site survey?
Predictive Modeling
The WiFi Multimedia (WMM) certification, which is illustrated in the exhibit, pertains to which topic?
Quality of Service
What is used as a relative measurement of signal strength at the receiving client on an 802.11 wireless LAN?
RSSI
What type of protection does a lightning arrestor provide to a WiFi system?
Redirection of transient current due to nearby lightning strikes
When an RF signal bounces off a smooth non-absorptive surface the behavior is called:
Reflection
When an RF signal passes between mediums of diff. densities and may change speed and bend, the behavior is
Refraction
ABC Company is comprised of four departments: sales, marketing engineering, and accounting. The company would like to separate the users on the WLAN so that users from different departments have access to different services on the network. To implement this strategy, you recommend a WLAN controller that supports _____________
Role Based Access Control (RBAC)
Which statement best defines SNR?
The difference between the noise floor and a signal's strength
After successfully connecting to the WiFi network in your hotel room, you launch a web browser on your laptop. Instead of opening your homepage, it directs you to a hotel-branded page that ask for your name, room number, and a secret key. What has most likely happened?
The hotel is using a captive portal to provide guest connectivity while keeping non-guest users off the wireless network
Given: In ABC Company's branch office, there are three 802.11n access points serviing 20 WiFi clients for email, web browsing, and occasional file sharing. Some users sit at a picnic table outside the builiding during lunchtime and have complained that the network is slow and connectivity is intermittent during this period of time.
The picnic tables are located at the edge of the effective range of WiFi coverage
The Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol is necessary in WiFi networks because ___________.
The wireless transmission medium is half-duplex, thus shared by all users
Your customer has asked you to recommend a WiFi solution that includes the following features: 1. Role Based Access Control 2. Stateful Firewall 3. Quality of Service
Wireless LAN Controller
ABC Company has recently deployed a WiFi network in their corporate facility. After deployment, the considered a solution for monitoring and enforcing their wireless secuirty policy. What type of system can perform this task?
Wireless intrusion Prevention System (WIPS)
Which two are relative measurements of RF Power?
dB dBi are relative measurements of RF power
What is the gain of an antenna measured in?
dBi
