Data communication mcq objective questions answers

DATA COMMUNICATION MQ WITH ANSWERS

1. A group of computers and other devices connected together is called …………….

a. Network

b. Networking

c. intranet

d. both b and c

2. Which of the following network is used to connect a number of computers to each other by cables in a single location?

a. WAN

b. LAN

c. MAN

d. both b and c

3. Transmission Lines are also called as………………….

a. circuits

b. channels

c. trunks

d. circuits channels, or trunks

4. A LAN (Local Area Network) can cover a distance of ___ KM.

a. 2

b. 8

c. 16

d. 32

5. Mutiple LANs can be connected to form a single MAN (Metropolitan Area Network). State TRUE/FALSE.

a. TRUE

b. FALSE

c. -

d. -

6. Cost of owning a LAN network over a WAN or MAN is __.

a. Less

b. More

c. -

d. -

7. The types of transmission channel or media used for LAN or WAN are __.

a. Twisted Pair Cables

b. Coaxial Cables

c. Fiber-Optic Cables and Radio Waves

d. All the above

8.Which type of network supports transmitting voice, video and data?

a. LAN

b. MAN

c. WAN

d. All the above

9. The largest WAN existing on this earth is ___.

a. Extranet

b. Internet

c. ARPANET

d. SONET

10.Multiplexing is used in _______

a. Packet switching

b. Circuit switching

c. Data switching

d. Packet & Circuit switching

11. Which multiplexing technique used to transmit digital signals?

a. FDM

b. TDM

c. WDM

d. FDM & WDM

12. Multiplexing provides _________

a. Efficiency

b. Privacy

c. Anti jamming

d. Both Efficiency & Privacy

13. OSI stands for __________

a. open system interconnection

b. operating system interface

c. optical service implementation

d. open service Internet

14. The number of layers in ISO OSI reference model is __________

a. 4

b. 5

c. 6

d. 7

15. TCP/IP model does not have ______ layer but OSI model have this layer.

a. session layer

b. transport layer

c. application layer

d. network layer

16. Which layer provides the services to user?

a. application layer

b. session layer

c. presentation layer

d. physical layer

17. Transmission media are directly controlled by the

a. physical layer

b. data link layer

c. network layer

d. session layer

18. Bus is a type of topology.

a. True

b. False

19. A topology that involves Tokens.

a. Star

b. Ring

c. Bus

d. Daisy Chaining

20. Which is the correct example of a binary operator?

a. ++

b. —

c. Dereferencing operator(*)

d. +

21. What is meant by multiple inheritance?

a. Deriving a base class from derived class

b. Deriving a derived class from base class

c. Deriving a derived class from more than one base class

d. None of the mentioned

22. Inheritance allow in C++ Program?

a. Class Re-usability

b. Creating a hierarchy of classes

c. Extendibility

d. All of the above

23. What are the things are inherited from the base class?

a. Constructor and its destructor

b. Operator=() members

c. Friends

d. All of the above

24. Which of the following advantages we lose by using multiple inheritance?

a. Dynamic binding

b. Polymorphism

c. Both Dynamic binding & Polymorphism

d. None of the mentioned

25. Which among the following best describes polymorphism?

a. It is the ability for a message/data to be processed in more than one form

b. It is the ability for a message/data to be processed in only 1 form

c. It is the ability for many messages/data to be processed in one way

d. It is the ability for undefined message/data to be processed in at least one way

26. If same message is passed to objects of several different classes and all of those can respond in a different way, what is this feature called?

a. Inheritance

b. Overloading

c. Polymorphism

d. Overriding

27. Which type of function among the following shows polymorphism?

a. Inline function

b. Virtual function

c. Undefined functions

d. Class member functions

28. Which among the following can’t be used for polymorphism?

a. Static member functions

b. Member functions overloading

c. Predefined operator overloading

d. Constructor overloading

29. Which will be used with physical devices to interact from C++ program?

a. Programs

b. Library

c. Streams

d. Iterators

30. Iostream is a subclass of

a. istream

b. instream

c. ostream

d.Both A and C

31. C++ uses <iostream.h> directive because

a. C++ is an object oriented language

b. C++ is a markup language

c. C++ does not have any input/output facility

d. All of them

32. The unformatted input functions are handled by

a. ostream class

b. instream class

c. istream class

d. bufstream class

33. The istream class defines the

a. Cin objects

b. Stream extraction operator for formatted input

c. Cout objects

d. Both A and B

34. The default constructor for ios class is

a. Public

b. Private

c. Protected

d. Any of them

35. What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?

a. Application

b. Host to host

c. Internet

d. Network Access

36. Which of the following protocols uses both TCP and UDP?

a. FTP

b. SMTP

c. Telnet

d. DNS

37.TCP/IP layer is equivalent to combined Session, Presentation and _________

a. Network layer

b. Application layer

c. Transport layer

d. Physical layer

38. Which of the following is an example of a bounded medium?

a. coaxial cable

b. wave guide

c. fiber optic cable

d. all of these

39. Which topology requires a central controller or hub?

a. Star

b. Mesh

c. Bus

d. Ring

40. 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 KEY : 

Q.1. Ans. A. network

Q.2. Ans. B. LAN

Q.3. Ans. D. circuits channels, or trunks

Q.4. Ans. A. 2

Q.5. Ans. A. True

Q.6. Ans. A. leds

Q.7. Ans. D. all the above

Q.8. Ans. D. all the above

Q.9. Ans. B. internet

Q.10 .Ans. B. circuit switching

Q.11. Ans. B. TDM

Q.12. Ans. D. both efficiency & privacy

Q.13. Ans. A. open system interconnection

Q.14. Ans. D. 7

Q.15. Ans. A. session layer

Q.16. Ans. A. application layer

Q.17. Ans. A. Physical layer

Q.19. Ans. A. true

Q.19. Ans. B. ring

Q.20. Ans. D. +

Q.21. Ans. C. Deriving a derived class from more than one base class

Q.22. Ans. D. All of the above

Q.23. Ans. D. all of the above

Q.24. Ans. C. both

Q.25. Ans. A. It is the ability for a message/data to be processed in more than one form

Q.26. Ans. C. Polymorphism

Q.27. Ans. B. virtual function

Q.28. Ans. A. Static member functions

Q.29. Ans. C. streams

Q.30. Ans. D. both a and c

Q.31. Ans. C. C++ does not have any input/output facility

Q.32. Ans. C. istream class

Q.33. Ans. D. Both A & B

Q.34. Ans. B. private

Q.35. Ans. B. host to host

Q.36. Ans. D. dns

Q.37. Ans. B. application layer

Q.38. Ans. D. All of these

Q.39. Ans. A. star

Q.40. Ans. A. Full duplex