IS 335 Mid-Term
10mW + 10dB =
100mW
10mW + 3dB =
20mW
10mW + 4dB =
25mW
300mW - 10dB =
30mW
100mW - 3dB =
50mW
Each of the following is a data rate of IEEE 802.11b except
54 mbps
What is the maximum data speed of an IEEE 802.11a WLAN?
54 mbps
(Barring vendor-specific "turbo modes") IEEE 802.11g network can transmit at the same maximum speed as
802.11a
_____ is a body that servers as the primary regulatory agency for wireless communications in the United States and its territories.
FCC
40% of the first Fresnel Zone must be clear of obstacles.
False
A WPAN is wired network
False
A lightweight access point contains management and configuration functions
False
A wireless presentation gateway provides encryption and authentication services for a wireless network and resides between the wireless network and the wired network to serve as the entry point to the wired network.
False
A working group is an CWNA committee responsible for the creation and oversight of a specific standard.
False
APs with multiple antennas employ antenna universality to improve reception.
False
Attenuation is the time lapse between when a packet is sent on a network and when it is received.
False
Bluetooth is a WWAN technology
False
Bluetooth is a digital video disc technology.
False
Compact Flash is a combination of an SD card and an input/output (I/O) device such as a wireless NIC.
False
Eliminating installation costs is a disadvantage of a WLAN
False
GPS is a system of earth-orbiting planets used as a navigation system
False
Multiplication is the increase in a signal's strength to achieve gain.
False
Nulling is the cancellation of a signal that occurs when a delayed multi path signal is 90 degrees out of phase with the primary signal.
False
Reflection is the RF propagation behavior in which an RF signal is assimilated into a material.
False
Security is considered an advantage of wireless technology.
False
The FTC is a body that serves as the primary regulatory agency for wireless communications in the United States and its territories.
False
The Phantom Zone is an elliptical area immediately surrounding the visual line of sight of an RF transmission.
False
The Receive Signal Strength Indicator (RSSI) is a precise indicator to use for RF signal strength.
False
The distance between peaks of an electromagnetic wave is called hertz
False
The license-exempt spectrum does not have any restrictions on power.
False
Two signals that have the same peaks and valleys are called out of phase
False
Waves vary by the number of cycles created each second and this is called the wave's phase.
False
Each of the following is an advantage of standards except
Increased costs
Which of the following is not a disadvantage of a wireless data network?
Mobility
4G is a cellular wireless data network technology through which a user can access the Internet.
True
54 Mbps is the maximum data speed of an IEEE 802.11a WLAN
True
A SISO system has 1 radio chain.
True
A backhaul connection is an organization's internal infrastructure connection between two or more remote locations.
True
A digital signal can contain numerous starts and stops throughout a signal stream.
True
A loss of 3 decibels means that 50% percent of the power in mW has been lost.
True
A mesh access point does not have to be individually connected by a cable to the existing wired network but instead each device communicates wirelessly with the next closest one.
True
A million cycles per second is a MHz
True
A watt is a basic unit of power of 1 amp of current that flows at 1 volt.
True
A wireless workgroup bridge is used to connect a wired network segment with a wireless network segment
True
APs with multiple antennas employ antenna diversity to improve reception.
True
According to the text, 4G is a cellular wireless data network with average download speeds of 4 Mbps
True
According to the text, there are three categories of antennas.
True
Active gain is the gain in which additional power was sent to the antenna from the power source.
True
Amps are the measure of the flow of electrical current.
True
An IEEE 802.11g network can transmit at the same maximum speed as IEEE 802.11a
True
An IR is an intentional radiator.
True
An access point connects wireless devices to each other and to a wired network.
True
An access point consists of an antenna and a radio transmitter/receiver to send and receive wireless signals
True
An amplifier is a device that increases the amplitude of the RF signal.
True
An antenna's beamwidth indicates how narrow or wide the transmission is.
True
An elevation chart shows the vertical coverage area of an antenna.
True
Bluetooth was originally designed to replace wires with radio-based technology.
True
Consortia are industry sponsored organizations that want to promote a specific technology.
True
Cycles are illustrated by an up-and-down wave called an oscillating signal
True
EIRP is the power radiated out by the wireless system and includes any antenna gain.
True
Electromagnetic waves can have different distances between their peaks and the distance is called the wavelength.
True
Fade Margin is the difference between the received signal level and the signal level that is required by that radio to assure that the transmission can be decoded without errors.
True
Fade margin is the difference between the received signal level and the signal level that is required by the radio to assure that the transmission can be decoded without errors.
True
For WLANs, if one part of the equipment has different impedance than another part, the RF signal may be reflected back within the device itself, causing a loss of signal strength and possibly damage to the device.
True
For an electromagnetic wave, the amplitude is the magnitude of the change of the wave and is measured by how high or how deep the wave is.
True
Frequency is the number of times a wave completes a cycle in a given amount of time.
True
Gain is the measure of amplification.
True
Generally, a semidirectional antenna will only transmit its signal no more than 180 degrees.
True
LoS is a term used to refer to a setting in which an emitter is aimed directly at a transmitter with no intervening obstacles
True
Most high-rate wide-area wireless systems, such as 4G mobile phone technologies like LTE and WiMAX use MIMO.
True
One of the disadvantages of wireless networks is security.
True
Polarization is the orientation of radio waves as they leave an antenna
True
RFID is a wireless technology that emits a wireless data signal over a short range.
True
RFID tags emit a wireless data signal containing an identification number that is linked to information and can be easily be affixed to the underside of a label.
True
Refraction involves a signal being redirected due to a change in medium, such as atmospheric changes
True
Resistance is the measure of the restriction of the flow of electric current.
True
Signal-to-noise ratio (SNR) is the ratio between desired signal and undesired signal, or noise.
True
The 10's and 3's rule of RF Math mean that when a signal loses 10 dB, it has lost 90% of its signal strength.
True
The Wi-Fi Alliance is an organization that verifies a product follows IEEE standards.
True
The form factor of a device describes its shape and size.
True
The general rule of thumb is that 60 percent of the first Fresnel zone must be clear of obstacles.
True
The last mile connection begins at a fast ISP, goes through a neighborhood, and ends at the home or office.
True
The modification of the height of a digital signal is called ASK
True
The number of unlicensed bands that are used for WLANs is 2
True
The orientation of radio waves as they leave an antenna is called polarization
True
The phase of a wave is the relationship between at least two signals that share the same frequency, but have different starting points.
True
The reference point that relates the logarithmic relative decibel (dB) scale to the linear milliwatt scale is known as the decibel milliwatt (dBm)
True
There are four basic types of wireless networks (according to the textbook)
True
Two signals that are out of phase do not share the same peaks and valleys.
True
WLAN Autoconfig is a Microsoft Windows 7 (and Vista) wireless connection management utility that uses the default settings of the client hardware NIC drivers.
True
WLAN, WMAN, WPAN, WWAN are all types of wireless networks.
True
WZC is a wireless connection management utility that operates as a Windows service and interacts with the client hardware NIC drivers
True
WiFi Alliance verifies that a product follows IEEE standards.
True
X-rays are a category of the electromagnetic spectrum
True
dBd compares the antenna gain against that of a dipole antenna.
True
______ is the theoretical maximum rated speed of a network.
data rate
Standards that set by an official body are called
de jure
A(n) _____ transmission requires that the emitter and detector be directly aimed
directed
IEEE 802.11 specified that either radio frequency waves or _____ could be used in a WLAN.
infrared light
What happens when a mobile wireless devices moves away from the transmitter in a WLAN?
the device decreases its data rates to the next lower acceptable data level