Data Communication and Networking MCQs

21.

Which of the following is not a characteristic of the hub architecture of Arc net?

   A.) Directionalized transmission
   B.) Alternative routing
   C.) Zero insertion loss amplifier
   D.) RIM port isolation

Answer: Option 'B'

Alternative routing

22.

A group of packets from a source through an X.25 packet system to sink.

   A.) arrive in the same order sent for VC, but not for PVC
   B.) arrive in the same order sent for PVC, but not for VC
   C.) arrive in the same order sent for both VC and PVC
   D.) None of these

Answer: Option 'C'

arrive in the same order sent for both VC and PVC

23.

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

   A.) three
   B.) four
   C.) two
   D.) seven

Answer: Option 'A'

four

24.

A protocol is a rule governing a time sequence of events that must take place.

   A.) between peers
   B.) across an interface
   C.) between non-peers
   D.) none of these

Answer: Option 'A'

between peers

25.

What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?

   A.) 2
   B.) 3
   C.) 4
   D.) 7

Answer: Option 'B'

3

26.

Layer one of the OSI model is _______.

   A.) physical layer
   B.) link layer
   C.) transport layer
   D.) network layer

Answer: Option 'A'

physical layer

27.

Establishing a virtual connection is functionally equivalent to _______.

   A.) physically connecting a DTE and DCE
   B.) connecting a virtual memory
   C.) placing a telephone call prior to a conversation
   D.) none of these

Answer: Option 'C'

placing a telephone call prior to a conversation

28.

What is the main purpose of a data link content monitor?

   A.) measurement of bit error rate.
   B.) Determine the type of switching used in a data link.
   C.) Determine the type of transmission used in a data link.
   D.) Detect problems in protocols.

Answer: Option 'D'

Detect problems in protocols.

29.

Protocol converters are _______.

   A.) same as multiplexers
   B.) same as TDMs
   C.) usually not operated in pairs
   D.) usually operated in pairs

Answer: Option 'C'

​usually not operated in pairs

30.

Satellite transponders contain ______. 

   A.) a receiver and transmitter designed to relay microwave transmission from one point on earth to another
   B.) a device that echoes the radiation without change from one point on earth to another
   C.) devices that transform the message sent from one location on earth to a different code for transmission to another location
   D.) all of these

Answer: Option 'A'

​a receiver and transmitter designed to relay microwave transmission from one point on earth to another

31.

Satellite transponders.

   A.) use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations.
   B.) use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations.
   C.) use a single frequency for reception and transmission from one point on earth to another
   D.) are devices that echo the radiation without change from one point on earth to another

Answer: Option 'A'

use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations.

32.

Satellite in geosynchronous orbit…

   A.) remains in a fixed position relative to points on earth
   B.) can cover about 80
   C.) moves faster than the earth’s rotation so that it can cover a larger portion of the earth
   D.) remains in a fixed position so as the earth rotates it can fully cover the earth.

Answer: Option 'D'

remains in a fixed position so as the earth rotates it can fully cover the earth.

33.

A spin stabilized satellite.

   A.) solar cells mounted on a cylinder body that continuously rotate so that about 40a time.
   B.) gyroscopic action of a spinning satellite to maintain its orientation towards the earth and the sun
   C.) solar panels whose cells are continually oriented towards the sun
   D.) both (A) and (B)

Answer: Option 'D'

both (A) and (B)

34.

What frequency range is most affected by fog and precipitation?

   A.) 4GHz to 6GHz
   B.) 6GHz to 10GHz
   C.) above 10GHz
   D.) 2GHz to 4GHz

Answer: Option 'C'

​above 10GHz

35.

In OSI network architecture, the routing is performed by _______

   A.) a data link layer
   B.) network layer
   C.) transport layer
   D.) session layer

Answer: Option 'B'

network layer

36.

In OSI network architecture, the dialogue control, and token management are responsibilities of _______.

   A.) data link layer
   B.) network layer
   C.) transport layer
   D.) session layer

Answer: Option 'D'

session layer

37.

Which of the following is not an example of data communication?

   A.) A salesman telephoning orders to the office
   B.) A teletype printing news bulletins.
   C.) A computer transmitting files to another computer
   D.) An automatic teller machine checking account balance with the bank’s computer

Answer: Option 'A'

​A salesman telephoning orders to the office

38.

The standard ASCII ______.

   A.) is version II of the ASC standard
   B.) has 128 characters, including 32 control characters
   C.) is a subset of the 8-bit EBCDIC code
   D.) is used only in the United States and Canada

Answer: Option 'B'

​has 128 characters, including 32 control characters

39.

Escape sequences

   A.) use ESC character to indicate the start of a special control sequence
   B.) are used to switch (escape) between ASCII and EBCDI codes
   C.) are a popular daydream for inmates
   D.) None of these

Answer: Option 'A'

​use ESC character to indicate the start of a special control sequence

40.

Fibre-optic cables operate at frequencies near _______.

   A.) 20 MHz
   B.) 200 MHz
   C.) 2 GHz
   D.) 800 THz

Answer: Option 'D'

800 THz


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