BC0048 Computer Networks MQP

8/13/2019 BC0048 Computer Networks MQP

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Model Question Paper

Subject Code: BC0048

Subject Name: Computer Networks

Credits: 4 Marks: 140

Part A (One mark questions)

1. The term Computer Network is used to mean an interconnected collection of--------------------

----

A) Mini computers

B) Super computers

C) Autonomous computers

D) Micro computers

2. A node, which is more powerful, and can handle local information processing or graphics

processing is called a------------------.

A) Workstation

B) Server

C) Network Operating System

D) Peer system

3. The collection of communication lines and routers is called --------------------


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A) LAN

B) WAN

C) MAN

D) Communication subnet

4. Wireless networks are mainly classified into ------------- categories.

A) 4

B) 2

C) 3

D) 6

5. In OSI-ISO architecture -------------------- layer is concerned with transmitting raw bits over thecommunication channel .

A) Data link Layer

B) Physical Layer

C) Session Layer

D) All of these

6. ------------------- is a set of rules governing the format and meaning of the packets, ormessages that are exchanged by the peer entities within a layer.

A) Interface

B) Reference model

C ) protocol

D) None of these


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7. -------------- is needed in the physical layer , where all the traffic for all connections has to besent over at most a few physical circuits.

A) subnet

B) Multiplexing

C) decoding

D) encoding

8. In OSI/IOS model at which layer modulator/demodulators are used ?

A) data link layer

B) network layer

C) session layer

D) physical Layer

9. ------------------- is/ are caused by the random motion of the electrons in a wire and isunavoidable.

A) Dispersion

B) Thermal noise

C) Delay distortion

D) all of these

10. ---------------- results from interference of different frequencies sharing the same medium.

A) Intermodulation

B) Cross talk

C) Impluse

D) Thermal noise


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11. In which mode of transmission, transmitting and receiving clocks are independent ofeach other.

A) Simplex

B) Half duplex

C) Synchronous

D) Asynchronous

12. UART stands for---------------------

A) user access remote terminal

B) universal asynchronous receiver transmitter

C) uni addressed remote terminal

D) none of these

13. The type of network topology in which all of the nodes of the network are connected to acommon transmission medium which has exactly two endpoints is called ------------------------------

A) BusB) RingC) TreeD ) Mesh

14.--------------- combines characteristics of linear bus and star topologies.

A) Ring topology

B) A hybrid topology

C ) A tree topology

D) mesh topology

15. A key characteristic of ----------------------- networks is that resources within the networkare dedicated to a particular call.


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A) message switching

B) Packet switching

C) Circuit switching

D) any of these

16. In a packet switching networks a typical upper bound on packet length is -------------.

A) 50 bytes

B) 100 bytes

C) 500 bytes

D) 1000 bytes

17. Which of these is an example for unguided transmission media?

A) coaxial cable

B) optical fibers

C) wireless

D) twisted pairs

18. The key concern in the design of transmission system is -------------- and ---------------

A) data rate ,distance

B) speed, accuracy

C) accuracy, simplicity

D) distance , cost

19. ------------- transmits a signal encoded beam of light by means of total internal reflection


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A) co-axial cable

B) twisted pair

C) microwave

D) none of these

20. In a twisted pair cable, twisting reduces---------------.

A) noise

B) electrical interference

C) cross talk

D) all of these

21. Which layer transfers data between adjacent network nodes in a wide area network orbetween nodes on the same local area network segment.

A) physical layer

B) Data link layer

C) Network layer

D) Session layer

22. The data link layer is split into -------------- and ----------------- sub layers.

A) MAC , LLC

B )MCC , LAC

C) MCM , LCM

D) CRC , MLC


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23. To find the hamming distance between two words we perform --------------- operationbetween those words.

A) NAND

B) NOR

C) EX-OR

D) OR

24. Given data is 1111101 , after using even parity the code becomes -------------------

A) 111111 1 1

B) 00000111

C) 10101010

D) 11111010

25. Pure ALOHA has a maximum throughput of -----------

A) 16.4 %

B) 18.4 %

C) 17.4 %

D) 1 %

26. preamble field of 802.3 frame is encoded using ------------------- encoding

A) Manchester

B) differential Manchester

C) Bi polar

D) uni polar


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27. In the IEEE standards 802.5 standard is also called ------------------

A) Ethernet

B) Token Bus

C) Wireless local area network

D) Token Ring

28. What is the length of Ethernet address ?

A) 32 bits

B) 64 bits

C) 48 bits

D) 16 bits

29. How many levels of priority is defined in IPV4 protocol?

A) 4

B)2

C )8

D) 6

30. ----------------is a static algorithm in which every incoming packet is sent out on everyoutgoing line except the one it arrives on.

A) Flooding

B) Congestion

C) Link state routing

D ) Distance vector


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35. Which of these function belongs to transport layer ?

A) routing of packets

B) congestion control

C) email

D) none of these

36. TPDU is an acronym for ---------------------

A) Transport protocol data unit

B) trasferent product data unit

C) transitive product data unit

D) transfer protocol digital unit

37. Packet lifetime can be restricted to a known maximum by using this /these method.

A) Restricted subnet design

B) putting a hop counter in each packet

C) time stamping each packet

D) all of these

38. Which of these protocol guarantees reliable and in-order delivery of data from sender toreceiver. ?

A) TCP/IP

B) UDP

C)STP


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D)TDP

39. Which of these is a feature of hubs ?

A) Hubs amplify the incoming signal.

B) Hubs understand frames, packets or headers

C) All lines coming into a Hub must operate at a same speed.

D) all of these

40. Hubs are classified as --------------- and --------------- hubs.

A) active, passive

B) synchronous, asynchronous

C) simplex, half duplex

D) one way , multi way


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Part B (Two mark questions)

41. ---------------have a single communication channel that is shared by all the users on the

network.

A) Point-to-poit

B) Broadcast networks

C) Protocol

D) PAN

42. The world wide Internet is a well known example of ------------------.

A ) PAN

B) Subnet

C) Intra-Network

D) inter-network

43. Which Layer is Responsible for Congestion Control ?

A) Network Layer

B) Datalink Layer

C) Transport Layer

D) Application layer

44) -------------Modulation, is a technique of conversion between the representation of digital data

in user equipment and the corresponding signals transmitted over a communications channel.


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A) Line coding

B) Demodulation

C) Modulation

D) Segmentation

45. Videoconferencing is an example for ------------------- communication

A) Simplex

B) Half duplex

C) Full duplex

D) serial

46. E-mail is an example of -------------- mode of communication where one party can send a

note to another person and the recipient need not be online to receive the e-mail.

A) asynchronous

B) synchronous

C) full duplex

D) either A) or B)

47. Following are the advantages of tree topology

i)Point-to-point wiring for individual segments.

ii)Supported by several hardware and software venders.

iii) Easy to install and wire


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A) i) only

B) i) and ii) only

C) iii) only

D) i) ,ii) and iii)

48. The most well-Known use of -------------------- is internet

A) Packet switching

B) circuit switching

C) message switching

D) multiplexing

49. Transmission medias are classified into two main categories, which are -------------- and --------------------.

A) twisted pair, coaxial

B) guided , unguided

C) analog, digital

D) synchronous, Asynchronous

50. Which of the following transmission media suffers more from transmission impairment.

A) coaxial cable

B) Optical fiber

C) twisted pair

D) wave guides


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D)TCP/IP

58. Two main important protocols of transport layer are ----------- and -------------.

A) SMTP, HTTP

B) TCP, UDP

C) UDP, HTTP

D) SMTP, UDP

59. --------------- are fast multi-port bridges that provide an economical way to resolve network

congestion.

A) Switches

B) Gateways

C) Routers

D) Brouters

60 In ----------------------- configuration, the switch begins to forward the packet as soon as itis received. No error checking is performed on the packet, so the packet is movedthrough very quickly.

A) cut-free

B) franment-free

C ) store-and-forward

D) cut-through


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Part C (Four mark questions)

61.Computer networks may be classified according to the -------------- at which they operate

according to some basic reference models that are considered to be standards in the industry

such as the----------- OSI reference model and the -----------TCP/IP model.

A) network layer, seven layer, four layers

B) transport layer, five layer, six layer

C) Physical layer, five layer, four layer

D) Physical layer, four layer, four layer

62. Match the following.

1. Physical Layer i) Dialogues control Network Layer ii) Raw bits Session Layer iii) Data encryption Presentation Layer iv) Routing Packet

A) 1-iii, 2-iv, 3- ii ,4-i 1-ii, 2-iv, 3-i , 4-iii 1-iii, 2-ii,3-iv,4-i 1-iv,2-iii,3-i,4-ii


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63. What are the advantages of synchronous communication.

1. it reduces overhead bits

2. The character is self contained & Transmitter and receiver need not be synchronized

3. It overcomes the two main deficiencies of the asynchronous method, that of inefficiency

and lack of error detection.

4. Transmitting and receiving clocks are independent of each other

A) 1,2, and 3

B) 1 and 3

C) 1,2 and 4

D) 1,2,3 and 4

64. Match the following

1) FDM i)Light streaming2) TDM ii) internet3) WDM iii) analog communication4) Packet switching Iv) digital communication

A) 1-iv, 2- i, 3-ii, 4- iii

B) 1- iii, 2-iv , 3-i, 4-ii

C) 1-ii, 2-i,3-iv 4-iii

D) 1-iii, 2-i, 3-ii, 4-iv



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1. CAT3 cable i) high speed computer communication2. CAT5 cable ii)2 GHz t0 40 GHz3. CAT6 & CAT 7 cable iii) 16 to 100 MHz4. wireless transmission iv) 250 MHz to 600 MHz

A) 1-iii, 2-I 3-iv, 4-ii

B) 1-iii, 2-iv 3-ii 4-i

C) 1-ii, 2-iii, 3-iv 4-i

D) 1-iv 2-iii, 3-i 4-ii

66. State true or false

i) The Hamming Distance for the codes generated using either even or odd parity willbe 2.

ii) The DLL translates the physical layers raw bit stream into discrete units calledpackets

iii) The network layer wants messages to be delivered to the remote peer in the exactsame order as they are sent.

iv) The data link layer is split into MAC and LLC sub layers.

A) true, true, true true

B) true, false , true, false

C) true, false, true, true

D) true, true, false, false


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1. preamble i. error checking

2. SOF ii. 10101010

3. checksum iii. 2 byte

4. Length iv 1 byte

A) 1- iv 2-i 3-ii 4-iii

B) 1- ii 2-iii 3-iv 4-i

C) 1-iii 2-iv 3-ii 4-i

D) 1-ii 2-iv 3-i 4- iii


i) Low bandwidth lines cause congestionii) Slow processors cause congestion.

iii) Adding more memory increase congestion

A) true, true, false

B) false ,true, false

C) true, false , false

D) true , true, true


1. TCP protocol is a connection less protocol.2. Automatic repeat request schemes may be used to retransmit lost or corrupted data.3. Automatic repeat request may keep the network in a congested state.


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4. TPDU is an acronym for transfer product data unit.

A) true true true true

B) False true false false

C) false true true false

D) true false false true


i. The connection establishment protocol introduced by Tomlinson is known as a three way

handshake.

ii. Asymmetric release is the way the telephone system works.

iii. The 16-bit checksum field is used for error-checking of the header and data.

A) false, false, false

B) true, true, true

C) true, false, false

D) false, false, true


1. Network layer i. HUB

2. Data link layer ii. Gateway

3. Transport layer iii. Router

4. Physical layer iv. Switch


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A) 1-iii 2-i 3- iv 4-ii

B) 1-iii 2-iv 3-ii 4-I

C) 1-ii 2-iii 3-iv 4-i

D) 1-iv 2-i 3-ii 4- iii


i. Both hubs and switches come in managed and unmanaged versions.ii. A bridge unlike repeaters will not start retransmission until it has received the

complete packet.iii. The looping problem cannot be avoided by using the Spanning Tree Algorithm(STA).

A) true, true, true

B) false, true, false

C) true, true, false

D) false, false, false


1. shortest path algorithm i. forwarding2. distance vector routing ii. Session routing3. virtual circuit iii. Static routing4. Datagram iv. Dynamic routing

A) 1-iii, 2- iv, 3-ii, 4-i

B) 1-ii ,2-iii , 3-iv , 4-i

C) 1-iii, 4-ii, 3-i, 4- iv

D) 1-iv , 2-iii, 3-ii, 4-i


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74. state true or false

1. CSMA/CD is a layer 2 protocol in a layer 2 protocol in the OSI model.

2. Network interface cards (NICs) or chips normally do not accept packets addressed to other

Ethernet stations.

3. P- persistent CSMA is a slotted approximation.

4. generally LANs can sense the channel but wireless networks cannot sense the channel

effectively.

A) true, false, true, false

B) false, false, false, true

C) true, true , true , true

D) true, true, false, false

75. Find the transmitted code if the frame is (MSB) 1101011011 (LSB) and generator

polynomial is x4 + x + 1.

A) 1101011011 1110

B) 1001011011 0010

C) 1000011011 1100

D) 1111011000 1110


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Answer Keys

Part - A Part - B Part - C

Q. No. Ans. Key Q. No. Ans. Key Q. No. Ans. Key Q. No. Ans. Key

1 C 21 B 41 B 61 A

2 A 22 A 42 D 62 B

3 D 23 C 43 A 63 B

4 C 24 D 44 C 64 B

5 B 25 B 45 C 65 A

6 C 26 A 46 A 66 C

7 B 27 D 47 B 67 D

8 D 28 C 48 A 68 D

9 B 29 C 49 B 69 C

10 A 30 A 50 C 70 B

11 D 31 D 51 C 71 B

12 B 32 B 52 A 72 C

13 A 33 A 53 C 73 A

14 C 34 B 54 D 74 C

15 C 35 D 55 D 75 A

16 D 36 A 56 B

17 C 37 D 57 A

18 A 38 A 58 B

19 D 39 C 59 A

20 B 40 A 60 D

BC0048 Computer Networks MQP

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