Wireless Comm MCQ
Wireless Comm MCQ
Wireless Comm MCQ
Prepared by:
Abhishek Sharma
Assistant Professor
1. In a _______ connection, more than two devices can share a single link.
a. Point-to-point
b. Primary
c. Multipoint
d. Secondary
answer (c): Multipoint
4. Which organization has authority over interstate and international commerce in the
communications field?
a. ITU-T
b. IEEE
c. ISO
d. FCC
answer (d): FCC
6. Frequency of failure and network recovery time after a failure are measures of the _______
of a network.
a. Performance
b. Security
c. Reliability
d. Feasibility
answer (c): Reliability
7. In _______ transmission, the channel capacity is shared by both communicating devices at
all times.
a. Full-duplex
b. Simplex
c. Half-duplex
d. Half-Simplex
answer (a): Full-duplex
11. When one of the components of a signal has a frequency of zero, the average amplitude of
the signal ________.
a. Is less than zero
b. Is greater than zero
c. Is zero
d. (a) or (b)
The correct answer is b
12. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest
frequency?
a. 5 KHz
b. 10 KHz
c. 47 KHz
d. 57 KHz
The correct answer is d
13. What is the bandwidth of a signal that ranges from 40 KHz to 4 MHz?
a. 3.96 MHz
b. 36 MHz
c. 360 KHz
d. 396 KHz
The correct answer is a
16. ________ is a type of transmission impairment in which the signal loses strength due to the
resistance of the transmission medium.
a. Distortion
b. Noise
c. Decibel
d. Attenuation
The correct answer is d
17. ________ is a type of transmission impairment in which the signal loses strength due to the
different propagation speeds of each frequency that makes up the signal.
a. Attenuation
b. Noise
c. Distortion
d. Decibel
The correct answer is c
18. ________ is a type of transmission impairment in which an outside source such as crosstalk
corrupts a signal.
a. Attenuation
b. Noise
c. Distortion
d. Decibel
The correct answer is b
28. Which multiplexing technique shifts each signal to a different carrier frequency?
a. TDM
b. FDM
c. Both (a) and (b)
d. None of the above
The correct answer is b
29. In TDM, for n signal sources of the same data rate, each frame contains _______ slots.
a. 0 to n
b. n
c. n + 1
d. n - 1
The correct answer is b
30. In TDM, the transmission rate of the multiplexed path is usually _______ the sum of the
transmission rates of the signal sources.
a. 1 less than
b. Greater than
c. Less than
d. Equal to
The correct answer is b
31. The sharing of a medium and its link by two or more devices is called _______.
a. Modulation
b. Encoding
c. Multiplexing
d. Line discipline
The correct answer is c
32. In AT&T's FDM hierarchy, the bandwidth of each group type can be found by multiplying
_______ and adding extra bandwidth for guard bands.
a. The sampling rate by 4000 Hz
b. The number of voice channels by 4000 Hz
c. The number of voice channels by 8 bits/sample
d. The sampling rate by 8 bits/sample
The correct answer is b
34. The VLF and LF bands use _______ propagation for communications.
a. Space
b. Ground
c. Sky
d. Line of sight
The correct answer is b
36. When we talk about unguided media, usually we are referring to _______.
a. Metallic wires
b. Nonmetallic wires
c. The air
d. None of the above
The correct answer is c
45. _______ requires one primary station and one or more secondary stations.
a. Token ring
b. Reservation
c. Polling
d. CSMA
The correct answer is c
47. If a TDMA network has eight stations, the medium bandwidth has _______ bands.
a. 1
b. 2
c. 8
d. 16
The correct answer is a
48. If a CDMA network has eight stations, the medium bandwidth has _______ bands.
a. 1
b. 2
c. 8
d. 16
The correct answer is a
49. A wireless LAN using FHSS hops 10 times per cycle. If the bandwidth of the original signal is
10 MHz and 2 GHz is the lowest frequency, the highest frequency of the system is _______
GHz.
a. 1.0
b. 2.0
c. 2.1
d. 3.0
The correct answer is c
50. An FHSS wireless LAN has a spread spectrum of 1 GHz. The bandwidth of the original signal is
250 MHz, and there are ______ hops per cycle.
a. 4
b. 3
c. 2
d. 1
The correct answer is a
51. A wireless LAN using FHSS hops 10 times per cycle. If the bandwidth of the original signal is
10 MHz, the spread spectrum is _______ MHz.
a. 1000
b. 10,000
c. 10
d. 100
The correct answer is d
52. A wireless LAN using DSSS with an 8-bit chip code needs _______ MHz for sending data that
originally required a 10-MHz bandwidth.
a. 20
b. 80
c. 2
d. 8
The correct answer is b
53. A wireless LAN using DSSS with _______-bit chip code needs 320 MHz for sending data that
originally required a 20-MHz bandwidth.
a. A 2
b. A 16
c. A 32
d. An 8
The correct answer is b
54. A wireless LAN using DSSS with a 4-bit chip code needs 10 MHz for sending data that
originally required a _______-MHz bandwidth.
a. 20
b. 25
c. 40
d. 2.5
The correct answer is d
57. A station with _______ mobility can move from one BSS to another.
a. No-transition
b. ESS-transition
c. BSS-transition
d. (b) and (c)
The correct answer is c
60. What is the basic access method for wireless LANs as defined by IEEE 802.11?
a. LLC
b. PCF
c. DCF
d. BFD
The correct answer is c
63. In the ______ method, the sender hops from frequency to frequency in a specific order.
a. DSSS
b. FHSS
c. OFDM
d. HR-DSSS
The correct answer is b
65. A wireless LAN uses _______ frames for the initial communication between stations and the
access points.
a. Control
b. Data
c. Management
d. None of the above
The correct answer is c
77. The path that a satellite makes around the world is called _______.
a. An orbit
b. A period
c. A footprint
d. An uplink
The correct answer is a
83. The signal from a satellite is aimed at a specific area called the _______.
a. Orbit
b. Period
c. Footprint
d. Uplink
The correct answer is c
84. In _______, a mobile station always communicates with just one base station.
a. Roaming
b. A roaming handoff
c. A hard handoff
d. A soft handoff
The correct answer is c
90. Transmission from the Earth to the satellite is called the _______.
a. Downlink
b. Uplink
c. Footlink
d. Up print
The correct answer is b
92. _______ is a Frame Relay option that transmits voice through the network.
a. LMI
b. FRAD
c. VOFR
d. DLCI
The correct answer is c
94. Routing and switching in Frame Relay are performed by the _______ layer.
a. Physical
b. Network
c. Data link
d. (b) and (c)
The correct answer is c
95. Because ATM _______, which means that cells follow the same path, the cells do not usually
arrive out of order.
a. Is asynchronous
b. Uses virtual circuit routing
c. Is multiplexed
d. Is a network
The correct answer is b
97. Which layer in ATM protocol reformats the data received from other networks?
a. Physical
b. Application adaptation
c. Data adaptation
d. ATM
The correct answer is b
98. A router reads the _______ address on a packet to determine the next hop.
a. MAC
b. Source
c. IP
d. ARP
The correct answer is c
99. A one-to-many communication between a source and a specific group of hosts is classified
as a _______ communication.
a. Multicast
b. Unicast
c. Broadcast
d. (a) and (b)
The correct answer is a