Networking Fundamental Online Objective Question Set 3

QN1: In OSI network architecture, the dialogue control and token management are responsibility of

a. session layer

b. network layer

c. transport layer

d. data link layer

e. none of above

Answer

Answer: a. session layer

QN2: In OSI network architecture, the routing is performed by

a. network layer

b. data link layer

c. transport layer

d. session layer

e. none of above

Answer

Answer: a. network layer

QN3: Which of the following performs modulation and demodulation?

a. fiber optics

b. satellite

c. coaxial cable

d. modem

e. none of the above

Answer

Answer: d. modem

QN4: The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:

a. modulation

b. demodulation

c. synchronizing

d. digitizing

Answer

Answer: d. digitizing

QN5: How many OSI layers are covered in the X.25 standard?

a. Two

b. Three

c. Seven

d. Six

e. None of above

Answer

Answer: b. Three

QN6: Layer one of the OSI model is

a. physical layer

b. link layer

c. transport layer

d. network layer

e. none of above

Answer

Answer: a. physical layer

QN7: Which of the following communication modes support two-way traffic but in only one direction at a time?

a. simplex

b. half duplex

c. three-quarters duplex

d. all of the above

e. none of the above

Answer

Answer: b. half duplex

QN8: The interactive transmission of data within a time sharing system may be best suited to

a. simplex lines

b. half-duplex lines

c. full duplex lines

d. biflex-lines

Answer

Answer: b. half-duplex lines

QN9: Which of the following statement is incorrect?

a. The difference between synchronous and asynchronous transmission is the clocking derived from the data in synchronous transmission.

b. Half duplex line is a communication line in which data can move in two directions, but not at the same time.

c. Teleprocessing combines telecommunications and DP techniques in online activities

d. Batch processing is the prefered processing mode for telecommunication operation.

Answer

Answer: d. Batch processing is the prefered processing mode for telecommunication operation.

QN10: Which of the following is considered a broad band communication channel?

a. coaxial cable

b. fiber optics cable

c. microwave circuits

d. all of above

Answer

Answer: d. all of above

QN11: Which of the following is not a transmission medium?

a. telephone lines

b. coaxial cables

c. modem

d. microwave systems

Answer

Answer: c. modem

QN12: Which of the following does not allow multiple uses or devices to share one communication line?

a. doubleplexer

b. multiplexer

c. concentrator

d. controller

Answer

Answer: a. doubleplexer

Answer

Answer: a. doubleplexer

QN13: Which of the following is an advantage to using fiber optics data transmission?

a. resistance to data theft

b. fast data transmission rate

c. low noise level

d. all of above

Answer

Answer: d. all of above

QN14: Which of the following is required to communicate between two computers?

a. communications software

b. protocol

c. communication hardware

d. all of above including access to transmission medium

Answer

Answer: d. all of above including access to transmission medium

QN15: Which data communication method is used to transmit the data over a serial communication link?

a. simplex

b. half-duplex

c. full-duplex

d. b and c

e. None of above

Answer

Answer: c. full-duplex

QN16: What is the minimum number of wires needed to send data over a serial communication link layer?

a. 1

b. 2

c. 4

d. 6

e. none of above

Answer

Answer: b. 2

QN17: Which of the following types of channels moves data relatively slowly?

a. wide band channel

b. voice band channel

c. narrow band channel

Answer

Answer: c. narrow band channel

QN18: Most data communications involving telegraph lines use:

a. simplex lines

b. wideband channel

c. narrowband channel

d. dialed service

Answer

Answer: c. narrowband channel

QN19: A communications device that combines transmissions from several I/O devices into one line is

a. concentrator

b. modifier

c. multiplexer

d. full-duplex line

Answer

Answer: c. multiplexer

QN20: How much power (roughly) a light emitting diode can couple into an optical fiber?

a. 100 microwatts

b. 440 microwatts

c. 100 picowatts

d. 10 miliwatts

Answer

Answer: a. 100 microwatts

QN21: The synchronous modems are more costly than the asynchronous modems because

a. they produce large volume of data

b. they contain clock recovery circuits

c. they transmit the data with stop and start bits

d. they operate with a larger bandwidth

e. none of above

Answer

Answer: b. they contain clock recovery circuits

QN22: Which of the following statement is correct?

a. terminal section of a synchronous modem contains the scrambler

b. receiver section of a synchronous modem contains the scrambler

c. transmission section of a synchronous modem contains the scrambler

d. control section of a synchronous modem contains the scrambler

e. none of the above

Answer

Answer: c. transmission section of a synchronous modem contains the scrambler

QN23: In a synchronous modem, the digital-to-analog converter transmits signal to the

a. equilizer

b. modulator

c. demodulator

d. terminal

e. none of above

Answer

Answer: a. equilizer

QN24: Which of the following is not a flow Control method?

a. Buffering

b. Unbuffered

c. Windowing

d. Congestion avoidance

Answer

Answer: b. Unbuffered

QN25: A remote batch-processing operation in which data is solely input to a central computer would require

a. telegraph line

b. simplex lines

c. mixed band channel

d. all of above

Answer

Answer: b. simplex lines

QN26: A band is always equivalent to

a. a byte

b. a bit

c. 100 bits

d. none of above

Answer

Answer: d. none of above

QN27: The loss in signal power as light travels down the fiber is called

a. attenuation

b. progragation

c. scattering

d. interruption

Answer

Answer: a. attenuation

QN28: Communications circuits that transmit data in both directions but not at the same time are operating in

a. a simplex mode

b. a half duplex mode

c. a full duplex mode

d. an asynchronous mode

Answer

Answer: b. a half duplex mode

QN29: As the data moves from the Upper to Lower Layers, headers are

a. Added

b. Subtracted

c. Rearranged

d. Modified

Answer

Answer: b. Subtracted

QN30: In communication satellite, multiple repeaters are known as

a. detector

b. modulator

c. stations

d. transponders

Answer

Answer: d. transponders

QN31: While transmitting odd-parity coded symbols, the number of zeros in each symbol is

a. odd

b. even

c. a and b both

d. unknown

Answer

Answer: d. unknown

QN32: Which type of network provides customers with limited access to corporate data such as inventory, Parts lists, and orders?

a. intranet

b. Extranet

c. Internetwork

d. Internet

Answer

Answer: b. Extranet

QN33: An example of an analog communication method is

a. laser beam

b. microwave

c. voice grade telephone line

d. all of the above

Answer

Answer: d. all of the above

QN34: Physical Layer is located in which layer of OSI

a. Layer 5

b. Layer 3

c. Layer 1

d. Layer 4

Answer

Answer: c. Layer 1

QN35: Physical Layer can only communicate with

a. Application Layer

b. Data link Layer

c. Transport Layer

d. Network Layer

Answer

Answer: b. Data link Layer

QN36: The Calculated value used by the Data Link Layer for error detections is

a. Checksum

b. Parity

c. CRC

d. The Data Link layer does not implement error detection

Answer

Answer: c. CRC

QN37: The channel in the data communication model can be

a. postal mail services

b. telephone lines

c. radio lines

d. any of the above

Answer

Answer: d. any of the above

QN38: Dividing a Network into smaller collisions domains is called

a. Bridging

b. Segmentation

c. Routing

d. Domaining

Answer

Answer: a. Bridging

QN39: Which of the following transmission systems provide the highest data rate to in individual device?

a. computer bus

b. telephone lines

c. voice and mode

d. lease lines

Answer

Answer: a. computer bus

QN40: A protocol is a set of rules governing a time sequence of events that must take place

a. between peers

b. between an interface

c. between modems

d. across an interface

Answer

Answer: a. between peers