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











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