Networking MCQ's Set - 3
41] The Shannon's result of signal to noise ratio is
(A) Bit rate = Bandwidth + log 2 (1 + S/N) bps
(B) Bit rate = Bandwidth * S/N
(C) Bit rate = Bandwidth * log 2(S/N).
(D) Bit rate = Bandwidth * log2 (1+S/N) bps.
ANSWER : D
42] In a communication system, noise is most likely to affect the signal _____
(A) at the transmitter
(B) at the receiver
(C) at the channel
(D) in the information source
ANSWER : C
43] VHF is ________
(A) Very Low Frequency
(B) Very High Frequency
(C) Very Hot Frequency
(D) none of these
ANSWER : B
44] Broadcast radio is ______ and microwave is ______
(A) omnidirectional; directional
(B) directional; omnidirectional
(C) directional; directional
(D) omnidirectional; omnidirectional
ANSWER : A
45] In fiber optics, the signal source is
(A) light
(B) radio
(C) infrared
(D) very low frequency0
ANSWER : A
46] Optical fiber is fabricated by
(A) glass
(B) copper
(C) aluminum
(D) none of the above
ANSWER : A
47] Device that accept a signal with specified frequency range and rebroadcast it over different frequencies is ________.
(A) transmitter
(B) receiver
(C) transponder
(D) responder
ANSWER : C
48] Shannon capacity is used to determine the theoretical highest data rate for a _________ channel.
(A) noiseless
(B) noisy
(C) noiseless & noisy
(D) none of these
ANSWER : B
49] As per Nyquist criterion the sampling rate is ______
(A) 2/fs
(B) (1/2) fs
(C) (1/2 fs)
(D) 2 fs
ANSWER : D
50] Nyquist theorem states that ________
(A) Bit rate = Baud rate0
(B) Bit rate + n = Baud rate
(C) Bit rate = 2f * n
(D) Bit rate = n + 2f
ANSWER : C
51] The Nyquist theorem specifies the minimum sampling rate to be _____
(A) equal to the lowest frequency of a signal
(B) equal to the highest frequency of a signal
(C) twice the bandwidth of a signa
(D) twice the highest frequency of a signal
ANSWER : D
52] Which of the following is not a reason to use fiber-optic cables for point to point data transmission ?
(A) Need to assure data security.
(B) Avoidance of ground loops
(C) Data -transfer rates too low to use metal cables.
(D) Elimination of spark hazards
ANSWER : C
53] Which of the following is NOT unguided media.
(A) Infrared
(B) Microwave
(C) Radio link
(D) Fiber optic
ANSWER : D
54] Wireless media are referred to as
(A) unbounded media
(B) bounded media
(C) both (A) and (B)
(D) None of these
ANSWER : A
55] Wired media are referred to as
(A) unbounded media
(B) bounded media
(C) both (A) and (B)
(D) None of these
ANSWER : B
56] What is a Local Area Network (LAN) ?
(A) A small network of shared peripheral devices.
(B) A network of connected computers in a single office, building or group of buildings at same site.
(C) A network of computers connected together across a wide geographical area.
(D) A network of computers connected together across a wide geographical area.
ANSWER : B
57] The primary difference between a LAN and a WAN is
(A) the number of software programs available
(B) distance
(C) the variety of hardware devices
(D) the number of hardware devices
ANSWER : B
58] What is a Wide Area Network (WAN) ?
(A) A large group of connected computers in the same room.
(B) A network of connected computers in a single office, building or group of buildings at same site.
(C) A group of smaller networks (or LANs) not connected together.
(D) A group of smaller networks (or LANs) connected together across a wide geographical area
ANSWER : D
59] Port address in TCP/IP is _____ bits in length.
(A) 8
(B) 16
(C) 24
(D) 32
ANSWER : B
60] Traditional LANs run at the speed of _______ to _________
(A) 1 Mbps; 10 Mbps
(B) 10 Mbps; 100 Mbps
(C) 100 Mbps; 1000 Mbps
(D) 1 Mbps; 100 Mbps
ANSWER : B
