Deck 6: Wireless Network Fundamentals

Question 1

Which digital signal modulation method is a binary modulation technique in which the carrier signal's frequency is changed to represent a 1 or 0 bit?

A) ASK
B) FSK
C) PSK
D) FDM

Answer 1

B

Question 2

Which term is the measurement of the difference between two signals?

A) watt
B) decibel
C) amp
D) volt

Answer 2

B

Question 3

Which of the following is true about RF transmissions?

A) EM radiation is measured in volts
B) frequency has an inverse relationship with wavelength
C) frequency is the distance between waves
D) cooler objects produce higher-frequency radiation than hotter objects

Answer 3

B

Question 4

What is used to convert an analog RF signal into digital format?

A) spectrum
B) EIRP
C) modulator
D) carrier

Question 5

Which of the following is defined as the maximum departure of a wave from the undisturbed state?

A) amplitude
B) spectrum
C) frequency
D) wavelength

Question 6

The Independent Basic Service Set is a wireless network that uses an AP.

Question 7

Which type of analog modulation changes the number of waves representing one cycle?

A) amplitude modulation
B) frequency modulation
C) phase modulation
D) relative modulation

Question 8

Which of the following causes of signal loss is defined as differences in density between air masses over distance?

A) reflection
B) absorption
C) scattering
D) refraction

Question 9

What does a measurement of +3 dB equal in power measured in mW?

A) double the power
B) 3 times the power
C) one third the power
D) one half the power

Question 10

RF signals can pass through walls and other objects while IR cannot.

Question 11

Which RF transmission method uses an expanded redundant chipping code to transmit each bit?

A) FHSS
B) OFDM
C) CDMA
D) DSSS

Question 12

Which of the following is true about infrared transmissions?

A) directed IR transmission relies on reflected light
B) diffused IR transmission requires emitter and detector to be aligned
C) the intensity of the light pulse indicates the on or off status of each bit
D) IR transmissions have speeds up to 25 Mbps.

Question 13

Which of the following is defined as the positive difference in amplitude between two signals?

A) fading
B) gain
C) reflection
D) attenuation

Question 14

In which frequency range are you likely to find WLANs?

A) 30-300 GHz
B) 174-328 MHz
C) 2.9-30 GHz
D) 3-30 MHz

Question 15

In wireless networks,infrared signals are used most often for data communications.

Question 16

What is a potential problem with having too many APs in a given area?

A) refraction
B) fading
C) multipath
D) co-channel interference

Question 17

The 802.11i standard maps to the WPA2 security protocol.

Question 18

Which of the following pairs represents a medium frequency band and its common use?

A) 300 KHz-3MHz, AM radio
B) 144-174 MHz, TV channels
C) 30-300 KHz, cordless phones
D) 3-30 MHz, CB and shortwave radio

Question 19

The Fresnel zone is the dispersal pattern of waves as they travel from sending to receiving antennas.

Question 20

Which binary signaling technique uses a scheme in which zero voltage represents a 0 bit and the voltage for a 1 bit does not drop back to zero before the end of the bit period?

A) RTZ
B) NRZ
C) polar NRZ
D) polar RTZ

Question 21

Which wireless networking standard uses the 2.4 GHz band and has a maximum bandwidth of 54 MBps?

A) 802.11a
B) 802.11b
C) 802.11ac
D) 802.11g

Question 22

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
a device used to transmit or receive radio waves

Question 23

What term is given to a device that is designed to generate radio signals,not including those from the antenna?

A) oscillator
B) conductive medium
C) intentional radiator
D) EIRP

Question 24

A wireless _______________ combines management and security into a single appliance and can perform authentication,encryption,intrusion detection,and other functions.

Question 25

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
a type of loss in which certain materials absorb the RF signal

Question 26

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
an area in which you can determine RF signal strength,identify potential obstacles,and determine the potential for multipath distortion

Question 27

A _________________ IR transmission relies on reflected light that can bounce off walls and other objects.

Question 28

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
the bit pattern used in direct sequence spread spectrum

Question 29

Cosmic objects emit different types of energy,known as _________________ radiation.

Question 30

What is a Basic Service Set?

A) a group of wireless devices served by a single AP
B) multiple APs are set up to provide some overlap
C) a wireless network that does not use an AP
D) wireless devices set up as a basic ad-hoc network

Question 31

Which wireless transmission method uses a hopping code?

A) infrared
B) OFDM
C) narrowband
D) FHSS

Question 32

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
the loss of signal strength resulting from the dispersion of the signal over distance

Question 33

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
a phenomenon tin which a signal bends around objects in its path

Question 34

RF transmits a _______________ signal which can change based on the signal's voltage and direction.

Question 35

The _____________________ wireless standard will use the 5 GHz band and will provide multistation WLANs with up to 1 Gbps bandwidth.

Question 36

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
the maximum departure of a wave from its undisturbed state; the height of the carrier wave

Question 37

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
the sequence of changing frequencies in FHSS that determines the sequence and speed of frequency hops

Question 38

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
the plane on which radio waves propagate,or the orientation of the radio waves as they leave the antenna

Question 39

Which of the following tasks does an AP typically perform?

A) bridges between the wired and wireless network
B) acts as a hub for a wired network
C) routes packets from subnet to subnet
D) divides data into packets

Question 40

MATCHING
a.absorption
b.amplitude
c.antenna
d.chipping code
e.diffraction
f.fading
g.free space path loss
h.Fresnel zone
i.hopping code
j.polarization
a form of interference/power loss in which the signal is reflected or refracted by the atmosphere,ground,or other obstacles,and the reflected path interferes with the direct path

Question 41

Describe how RF waves are transmitted and received by an antenna.

Question 42

What is the difference between directed IR transmission and diffused IR transmission?

Question 43

Describe two of the three methods of analog modulation.

Question 44

Describe multipath interference.

Question 45

Why should you use caution when using multiple APs?

Question 46

Discuss how an ESS works.

Question 47

Describe two of the four methods of digital signal modulation.

Question 48

Describe OFDM.

Question 49

Compare and contrast analog and digital RF signals.

Question 50

Describe how RF power is measured.