Computer Networks MCQ Questions and Answers

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MCQ Questions and Answers on Computer Networking

1. The available user bandwidth in an OC-12c connection is
(a) 75,096 user data bits
(b) 1080 user data bits
(c) 60,076 user data bits
(d) none of the above

2. To being telecomputing
(a) your personal computer must be connected via cables to a larger computer
(b) the communications software on your personal computer must be set to use the protocol used by the other computer
(c) both (a) and (b) above
(d) none of the above.

3. All of the parts in a computer talk to each other by sending
(a) digital signals
(b) analog signals
(c) smoothly varying signals waves
(d) both (a) and (c)

4. The cheapest modems can transmit
(a) 300 bits per second
(b) 2,400 bits per second
(c) 1,200 bits per second
(d) none of the above.

5. Which of the following digits are known as the area code of the Network User Address (NUA)?
(a) 5-7
(b) 8-12
(c) 1-4
(d) 13-14

6. Which of the following digits are known as the terminal number of the Network User Address (NUA) ?
(a) 5-7
(b) 8-12
(c) 1-4
(d) 13-14

7. Terminal emulation
(a) allows a dumb terminal to pretend that it is a personal computer
(b) allows a personal computer to pretend it is a computer terminal
(c) allows a dumb terminal to produce a local echo
(d) both (a) and (c) above

8. Auto dialling allows
(a) you do dialling phone numbers by typing them on the keyboard
(b) a personal computer to answer incoming calls without human assistance
(c) both (a) and (b) above
(d) none of the above

9. If you get both local and remote echoes every character you type will appear on the screen
(a) Once
(b) three times
(c) twice
(d) none of the above.

10. Synchronous protocols
(a) transmit character one at a time
(b) allow faster transmission than synchronous protocols do
(c) are generally used by personal computers
(d) all of the above.

11. To avoid transmission errors, a check figure is calculated by the
(a) transmitting computer
(b) receiving computer
(c) both (a) and (b) above
(d) none of the above.

12. Public access message systems
(a) have charges that very from Re. 50 to Rs. 200 an hour
(b) can usually be accessed by just one user at a time
(c) can only be used to send and receive messages.
(d) both (b) and (c) above.

13. Transferring information between an Apple II and an IBMPC
(a) can not be done
(b) enable you to run programs written for an Apple on an IBMPC
(c) can be done over telephone
(d) both (b) and (c) above.

14. The slowest transmission speeds are those of
(a) twisted-pair wire
(b) fiber-optic cable
(c) coaxial cable
(d) microwaves.

15. To connect a computer with a device in the same room. You might be likely to use
(a) a coaxial cable
(b) a ground station
(c) a dedicated line
(d) all of the above.

16. A central computer surrounded by one or more satellite computers is called a
(a) bus network
(b) star network
(c) ring network
(d) none of the above.

17. A network that requires human intervention to route signals called a
(a) ring network
(b) bus network
(c) star network
(d) T-switched network.

18. A packet-switching network
(a) if free
(b) can reduce the cost of using an information utility
(c) allows communication channels to be shared among more than one user
(d) both (b) and (c) above.

19. Device on one network can communicate with device on another network via a
(a) file server
(b) private server
(c) utility server
(d) gateway.

20. Local area network can transmit
(a) faster than telecommunications over public telephones lines
(b) slower then telecommunications over public telephones lines
(c) using twisted pair wiring on coaxial cables
(d) both (a) and (c) above.

21. A local area network
(a) that connects thirty personal computers can provide more computing power than a mini computer
(b) controls error detection and correction
(c) constructs packets of data and sends them across the network
(d) none of the above.

22. The physical layer of a network
(a) defines the electrical characters of signals passed between the computer and communication devices
(b) controls error detection and correction
(c) construction packets of data and sends them across the network
(d) none of the above.

23. An error detecting code in which code is the remainder resulting from dividing the bits to be checked by a predetermined binary number, is known as
(a) cyclic redundancy check
(b) checksum
(c) error detecting code
(d) error rate

24. Which of the following device is used with an X. 25 network to provide service to asynchronous terminals?
(a) Repeater
(b) Gateway
(c) Bridges
(d) Packed assembler/disassembler

25. The application layer of a network
(a) establishes, maintains and terminates virtual circuits
(b) defines the user’s part into the network
(c) consists of software being run on the computer connected to the network
(d) none of the above.

26. Parity bit is
(a) an error-detecting code based on a summation operation performed on the bits to be checked.
(b) A check bit appended to an array of binary digits to make the sum of all the binary digits
(c) A code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and thus the presence of the errors in detected.

27. Error rate is
(a) an error-detecting code based on a summation operation performed on the bits to be checked
(b) a check bit appended to an array of binary digits to make the sum of the binary digits
(c) a code in which each expression conforms to specific rules of construction. So that if resulting errors occur in an expression, the resulting expression will not conform to the rules of construction and thus the presence of the errors is detected
(d) the ratio of the number of data units in error to the total number of data units

28. Which of the following allows devices on the one network communicate with devices an another network ?
(a) Multiplexer
(b) T-switch
(c) Gateway
(d) Modem

29. How many pairs of stations can simultaneously communicate on Ethernet LAN?
(a) 1
(b) 31
(c) 2
(d) multiple

30. FDDI is a
(a) ring network
(b) mesh network
(c) star network
(d) bus based network.

31. The communication mode tel supports two way traffic but only one direction at a time is
(a) Simplex
(b) half duplex
(c) Duplex
(d) multiplex.

32. Error detecting code is
(a) an error-detecting code based on a summation operation performed on the bits to be checked
(b) check bit appended to an array of binary digits to make the sum of all the binary digits
(c) a code in which each expression conforms to specify rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and thus the presence of the errors is detected
(d) the ratio of the data units in error to the total number of data units.

33. Which of the following communications service provides message preparation and transmission facilities?
(a) Teletex
(b) Teletext
(c) X400
(d) Fax

34. A distributed network configuration in which all data/information pass through a control computer is
(a) bus network
(b) star network
(c) multiplex
(d) duplex

35. Which of the following medium access control technique is used for bus/tree?
(a) token ring
(b) CSMA
(c) token bus
(d) MAC

36. A 6 MHhz channel is used by digital signalling system utilizing 4-levels signals. What is the maximum possible transmission rate ?
(a) 1.5 M baud/sec
(b) 6 M baud/sec
(c) 12 M baud/sec
(d) 24 M baud/sec.

37. Which of the following network access standard is used for connection stations to a packet-switched network ?
(a) X.3
(b) X.21
(c) X.25
(d) X.75

38. Four bits are used for packed sequence numbering in a sliding window protocol used in a computer network. What is the maximum window size?
(a) 4
(b) 15
(c) 8
(d) 16

39. Which of the following network access standard is used for connecting stations to a circuit-switched network?
(a) X.3
(b) X.25
(c) X.21
(d) X.75

40. Satellite-switched, Time-Division Multiple Access (SS/TDMA) is
(a) the method of determining which device has access to the transmission medium at any time
(b) a medium access control technique for multiple access transmission media
(c) a form of TDMA in which circuit switching is used to dynamically change the channel assignments
(d) all of the above

41. A station in a network forwards incoming pockets by placing them on its shortest output queue. What routing algorithm is being used?
(a) Hot potato routing
(b) Static routing
(c) Flooding
(d) Data routing

42. How many bits internet address is assigned to each host on a TCP/IP internet which is used in all communication with the host ?
(a) 16-bits
(b) 32-bits
(c) 48-bits
(d) 64-bits

43. Two computers that communicate with each other use a simple parity check to defect errors for ASCII transmission. Which of the following events will always load to an undetected error ?
(a) One bit or any odd number of bits inverted in a block of data during transmission
(b) Two bits or any even number of bits inverted in a block during transmission
(c) One bit or any odd number of bits inverted in a byte during transmission
(d) Two bits or any even number of bits inverted in a byte during transmission.

44. RS-232-C
(a) is a interface between two data circuit terminating equipment as exemplified by a local and remote modem
(b) is an interface standard between data terminal equipment and data circuit terminating equipment
(c) specified only the mechanical characteristics of an interface by providing a 25-pin connector
(d) requires only 7-pin out of 25 in order to transmit digital data over public telephone lines.

45. IP address can be used to specify a broadcast and map to hardware broadcast if available by convention, broadcast address has hosted with all bits.
(a) 0
(b) both (a) and (b) above
(c) 1
(d) combination of O’s and I’s.

46. The 32-bit internet address 1000000 00001010 00000010 00011110 will be written in dotted decimal notation as
(a) 148.20.30
(b) 210.20.2.64
(c) 164.100.9.61
(d) 128.10.230

47. How many hosts are attached to each of the local area network at your site?
(a) 128
(b) 256
(c) 254
(d) 64

48. Which of the following statement is incorrect?
(a) If a host moves from one network to another, its IP address must change
(b) Routing uses the network portion of the IP address, the path taken by packets travelling to a host with multiple IP address depends on the address used
(c) IP addresses encode both a network and a host on that network, they do not specify an individual machine, but a connection to a network
(d) All of the above.

49. Which of the following statement is incorrect?
(a) The address resolution protocol, ARP allows a host to find the physical address of a target host on the some physical network given only the target IP address
(b) The sender’s IP-to-physical address binding is included in every ARP broadcast, receivers updatae the IP-to-physical address binding information in their cache before processing an ARP packet
(c) ARP is a low-level protocol that hides the underlying network physical addressing, permitting us to assign IP-addresses of our choice to every machine
(d) All of the above.

50. Which of the following TCP/IP internet protocol a disk less machine used to obtain its IP address from a server
(a) RDP
(b) RARP
(c) RIP
(d) X. 25