Wireless Chapter 5-6 Review Questions

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

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

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

The following graphic shows which type of antenna? A. Omnidirectional B. Yagi C. Patch/panel D. Parabolic dish

A. Omnidirectional The image is an example of an omnidirectional antenna. This type of antenna provides a horizontal radiation pattern of 360°.

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.

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.

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.

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.

The following image shows which type of antenna? A. Highly directional B. Dipole-directional C. Omnidirectional D. Semidirectional

D. Semidirectional The image shows a patch antenna. This is an example of a semidirectional antenna.