Upwork NETWORKING CONCEPTS TEST 2018

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1. Which of the following ranges are reserved as private addresses?

Answers:

1. 192.168.0.0 – 192.255.255.255
2. 172.16.0.0 – 172.255.255.255
3. 10.0.0.0 – 10.255.255.255
4. 172.16.0.0 – 172.31.255.255

2. What is a checksum?

Answers:

1. An error detection technique
2. A network troubleshooting device
3. Another name for protocol header
4. Another name for protocol trailer

3. What is multiplexing?

Answers:

1. Allowing multiple senders and receivers to share a single channel
2. Allowing multiple senders and receivers to share a single media
3. Allowing bi-directional communication

4. According to the OSI model, at which layer are network addresses assigned?

Answers:

1. Session
2. Data Link
3. Presentation
4. Network

5. According to the OSI model, which layer addresses the issue of network topologies (star, ring, bus etc)?

Answers:

1. Network
2. Data Link
3. Transport
4. Physical

6. What is the IEEE 802.3 standard related to?

Answers:

1. Definition of the Logical Link Control (LLC) sublayer
2. Token Ring
3. Token Bus
4. Ethernet

7. What is the maximum transmission speed of CAT 5 cable?

Answers:

1. 10 Mbps
2. 16 Mbps
3. 100 Mbps
4. 1000 Mbps

8. Which of the following is an ‘end-to-end’ layer?

Answers:

1. Physical
2. Data Link
3. Network
4. Transport

9. What is attenuation?

Answers:

1. Distortion of the signal due to noise
2. Distortion of the signal due to Electro Magnetic Interference
3. Weakening of the signal in a cable over a distance
4. Cross Talk

10. Old mainframe computers were an example of ______?

Answers:

1. Distributed computing
2. Client server computing
3. Peer to peer computing
4. Centralized computing

11. At which layer of the OSI model, does HTTP operate?

Answers:

1. Application
2. Transport
3. Session
4. Presentation

12. Which of the following is a disadvantage of Client Server networks?

Answers:

1. They have poor security
2. Data is not centrally organized
3. Centralized administration is not possible
4. They require high investment in the form of purchase of a server

13. Which cable used for RJ11 connectors?

Answers:

1. Thin Coaxial Cable
2. Thick Coaxial Cable
3. Unshielded Twisted Pair Cable
4. Telephone Cable

14. What is the speed of a E1 line?

Answers:

1. 128 kbps
2. 144 kbps
3. 2.048 Mbps
4. 1.544 Mbps

15. How many bits of the MAC address are used by OUI portion?

Answers:

1. 32 bits
2. 48 bits
3. 24 bits
4. 16 bits

16. What do you call a communication system in which data can be sent in both directions at the same time?

Answers:

1. Half Duplex
2. Full Duplex
3. Asynchronous
4. Synchronous

17. At which layer of the OSI model, does a World Wide Web browser operate?

Answers:

1. Application
2. Transport
3. Session
4. Presentation

18. Which of the following services is feasible using standard ISDN?

Answers:

1. Fax
2. Voice Telephony
3. Data Transfer
4. Video Conferencing
5. All of the above

19. What is ATM (Asynchronous Transfer Mode)?

Answers:

1. It is a WAN technology based on frequency division multiplexing that uses fixed size packets known as cells
2. It is a WAN technology based on time division multiplexing that uses variable size packets
3. It is a WAN technology based on time division multiplexing that uses fixed size packets known as cells
4. It is a virtual circuit based WAN technology

20. What is the maximum speed supported by a standard ISDN BRI?

Answers:

1. 64 kbps
2. 128 kbps
3. 256 kbps
4. 1.544 mbps

21. Which media access technique does Ethernet use?

Answers:

1. CSMA/CA
2. CSMA/CD
3. Tokens

22. What are PPP and SLIP most commonly used for?

Answers:

1. Connecting to the Internet through DSL lines
2. Connecting to the Internet through telephone lines
3. Connecting to the Internet through fibre optic lines
4. Connecting to the Internet using wireless modems

23. How is a unique MAC address assigned to a Network Card?

Answers:

1. It is built into the card when the card is manufactured
2. The network administrator must assign the address
3. A unique address is automatically assigned when the card drivers are installed
4. A unique address is automatically assigned whenver you boot up the computer

24. According to the OSI model, which layer performs compression and decompression?

Answers:

1. Application
2. Presentation
3. Session
4. Data Link

25. What is the full form of PPPoE?

Answers:

1. Point to Point Protocol over Exchange
2. Point to Point Password over Ethernet
3. Point to Point Protocol over Ethernet
4. None of the above

26. In a TCP/IP network, which of the following must be unique for each computer in the network?

Answers:

1. IP address
2. Subnet mask
3. Default Gateway

27. For which layer of the OSI model has the Ethernet standard been defined?

Answers:

1. Physical
2. Data Link
3. Network
4. Transport
5. Both a and b
6. both b and c

28. In a TCP/IP network, which layers are basically absent?

Answers:

1. Session, Presentation
2. Transport, Session
3. Session, Application
4. Presentation, Application

29. What is the maximum number of valid IP addresses in a class B network?

Answers:

1. 65536
2. 65534
3. 256
4. 254

30. According to the OSI model, which layer performs parity checking and error checking?

Answers:

1. Session
2. Data Link
3. Presentation
4. Physical

31. What is the IEEE 802.5 standard related to?

Answers:

1. Definition of the Logical Link Control (LLC) sublayer
2. Token Ring
3. Token Bus
4. Ethernet

32. According to the OSI model, which layer performs encryption and decryption?

Answers:

1. Application
2. Presentation
3. Session
4. Data Link

33. What do you call a fibre optic cable in which the light signals follow a single path?

Answers:

1. Multi mode
2. Single mode
3. Broadband
4. Baseband

34. Which of the following protocols does not support Routing?

Answers:

1. IPX/SPX
2. TCP/IP
3. NetBEUI

35. What is the full form of DSL?

Answers:

1. Digital Subscription Line
2. Digital Super Link
3. Digital Speed Line
4. Digital Subscriber Line

36. Which type of network uses dual fibre-optic rings?

Answers:

1. Ethernet
2. FDDI
3. Token Ring
4. ATM

37. Which protocol uses port number 23?

Answers:

1. FTP
2. SMTP
3. Telnet
4. HTTP

38. At which layer does a Bridge operate?

Answers:

1. Network
2. Physical
3. Session
4. Data Link

39. What do you call a fibre optic cable in which the light signals follow multiple paths?

Answers:

1. Multi mode
2. Single mode
3. Broadband
4. Baseband

40. According to the OSI model, which layer performs the function of transforming bits of data into electrical signals and sending those signals across the media?

Answers:

1. Network
2. Data Link
3. Transport
4. Physical

41. What do you call a communication system which uses start and stop bits to synchronize the sender and receiver?

Answers:

1. Half Duplex
2. Full Duplex
3. Asynchronous
4. Synchronous

42. Which of the following is mentioned in the correct sequence (from lowest layer to highest)?

Answers:

1. Physical, Network, Data Link, Session, Transport, Presentation, Application
2. Physical, Data Link, Network, Transport, Session, Presentation, Application
3. Transport, Session, Data Link, Application, Presentation, Network, Physical
4. Physical, Data Link, Network, Transport, Presentation, Session, Application

43. Which cabling media does not suffer from Electro-Magnetic Interference(EMI)?

Answers:

1. Thin Coaxial Cable
2. Thick Coaxial Cable
3. Unshielded Twisted Pair Cable
4. Fibre Optic Cable

44. What do you call a communication system which uses a clocking mechanism to synchronize the sender and receiver?

Answers:

1. Half Duplex
2. Full Duplex
3. Asynchronous
4. Synchronous

45. What is the binary value of hex BF?

Answers:

1. 10100000
2. 10111111
3. 11111000
4. 00111011

46. Which layer of the OSI model corresponds to IP?

Answers:

1. Network
2. Physical
3. Session
4. Data Link

47. How many bearer (B) and data (D) channels are there in a standard ISDN BRI service?

Answers:

1. 2B + 1D channel
2. 16B + 1D channel
3. 23B + 1D channel
4. 24B + 2D channels

48. According to the OSI model, which layer is responsible for routing?

Answers:

1. Session
2. Data Link
3. Presentation
4. Network

49. At which layer of the OSI model, does FTP operate?

Answers:

1. Application
2. Transport
3. Session
4. Presentation

50. What is the purpose of twisting the pairs of cables together in a UTP cable?

Answers:

1. To reduce attenuation
2. To reduce cross talk
3. To reduce Electro-Magnetic Interference
4. To reduce noise

51. What is the IEEE 802.2 standard related to?

Answers:

1. Definition of the Logical Link Control (LLC) sublayer
2. Token Ring
3. Token Bus
4. Ethernet

52. Which layer is broken down into the MAC and LLC sublayers?

Answers:

1. Network
2. Data Link
3. Session
4. Physical

53. According to the OSI model, which layer addresses the issues of communication media and cable connectors etc?

Answers:

1. Network
2. Data Link
3. Transport
4. Physical

54. At which layer of the OSI model, does SMTP (Simple Mail Transfer Protocol) operate?

Answers:

1. Application
2. Transport
3. Session
4. Presentation

55. What do you call a medium which only allows a single channel?

Answers:

1. Multi mode
2. Single mode
3. Broadband
4. Baseband

56. Which layer of the OSI model corresponds to TCP?

Answers:

1. Network
2. Transport
3. Session
4. Data Link

57. What is the X.25 protocol?

Answers:

1. It is a packet switching WAN protocol based on public data networks
2. It is a packet switching WAN protocol based on public telephone networks
3. It is a packet switching wireless LAN protocol
4. It is a packet switching wireless WAN protocol

58. What is the purpose of the shielding in a Shielded Twisted Pair (STP) cable?

Answers:

1. To reduce attenuation
2. To reduce cross talk
3. To reduce Electro-Magnetic Interference

59. What does CSMA/CA stand for?

Answers:

1. Collision Sense Multiple Access/ Collision Avoidance
2. Carrier Sense Multiple Access/ Collision Avoidance
3. Carrier Sense Multiple Access/ Collision Arbitration
4. Collision Sense Multiple Access/ Carrier Avoidance

60. What is the recommended maximum length(approx) for a segment of UTP cable?

Answers:

1. 500m
2. 1km
3. 100m
4. 180m

61. Which of the following is a Fiber Optic Connector?

Answers:

1. RJ-11
2. RJ-45
3. MT-RJ
4. None of the above

62. Which network topology does FDDI use?

Answers:

1. Star
2. Ring
3. Bus
4. Mesh

63. Which of the following is a disadvantage of Peer Networks?

Answers:

1. They require high investment in the form of purchase of a server
2. They require high investment in the form of purchase of a specialized network operating system
3. They usually require a network administrator
4. They have poor network security

64. According to the OSI model, which layer is responsible for sending acknowledgements?

Answers:

1. Session
2. Transport
3. Data Link
4. Presentation

65. At which layer of the OSI model, does a Proxy Server operate?

Answers:

1. Application
2. Transport
3. Session
4. Presentation

66. Which of the following is used as a high speed network backbone media?

Answers:

1. Thin Coaxial Cable
2. Thick Coaxial Cable
3. Unshielded Twisted Pair Cable
4. Fibre Optic Cable

67. According to the OSI model, which layer provides services such as file transfer, database access and email?

Answers:

1. Application
2. Presentation
3. Session
4. Data Link

68. Which of the following is false with regard to assymetric DSL?

Answers:

1. It uses standard copper telephone cables
2. It delivers much higher speeds than a serial modem
3. It uses more channels for downloading data and fewer for uploading
4. It employs analog modulation to deliver data from your PC to the telephone service provider

69. What is the binary value of hex 9F?

Answers:

1. 10011111
2. 10111000
3. 11110001
4. 10001111

70. What does CSMA/CD stand for?

Answers:

1. Collision Sense Multiple Access/ Collision Detection
2. Carrier Sense Multiple Access/ Collision Deterence
3. Carrier Sense Multiple Access/ Collision Detection
4. Collision Sense Multiple Access/ Carrier Detection

71. Which media suffers least from attenuation?

Answers:

1. Thin Coaxial Cable
2. Thick Coaxial Cable
3. Unshielded Twisted Pair Cable
4. Fibre Optic Cable

72. At which layer does a Hub operate?

Answers:

1. Network
2. Physical
3. Session
4. Data Link

73. According to the OSI model, which layer addresses the issue of connections (connection-oriented/ connection-less communication)?

Answers:

1. Physical
2. Data Link
3. Network
4. Transport

74. What is the speed of a T1 line?

Answers:

1. 128 kbps
2. 144 kbps
3. 2.048 Mbps
4. 1.544 Mbps

75. What do you call a medium which allows multiple channels?

Answers:

1. Multi mode
2. Single mode
3. Broadband
4. Baseband

76. Which protocol is connection oriented?

Answers:

1. TCP
2. IP
3. UDP
4. ICMP

77. Which of the following is a Class A network?

Answers:

1. 172.0.0.0
2. 126.0.0.0
3. 192.0.0.0
4. 225.0.0.0

78. Which cable uses RJ45 connectors?

Answers:

1. Thin Coaxial Cable
2. Thick Coaxial Cable
3. Unshielded Twisted Pair Cable
4. Shielded Twisted Pair Cable

79. At which layer does a Router operate?

Answers:

1. Network
2. Physical
3. Transport
4. Data Link

80. What is a token?

Answers:

1. A part of the packet trailer in a token ring network
2. A part of the packet header in a token ring network
3. A special packet which travels from computer to computer in a token ring network

81. What are V.42, V.22, V.42bis?

Answers:

1. IEEE standards
2. Modem standards
3. CCITT standards
4. MAC addressing formats
5. Digital Certificate formats

82. According to the OSI model, which layer breaks down the data into frames?

Answers:

1. Network
2. Data Link
3. Transport
4. Physical

83. Which network topology does Ethernet use?

Answers:

1. Star
2. Ring
3. Bus
4. Mesh

84. What is the speed of ISDN PRI service with 30B + 1D channel?

Answers:

1. 2.048 Mbps
2. 1.544 Mbps
3. 144 Kbps
4. 128 Kbps

85. Which type of connector is mostly used these days for connectivity with the network card?

Answers:

1. RJ-11
2. BNC
3. RJ-45
4. RJ-33

86. What is the purpose of the MAC sublayer?

Answers:

1. Sending acknowledgements whenever packets are received
2. Performing data compression
3. Performing encryption and decryption
4. Controlliing the way multiple devices share the same media

87. Which of the following cables can be used to connect a PC and a Hub?

Answers:

1. Straight cable
2. Cross cable
3. Rollover cable
4. Any of the above

88. What is the binary value of 157?

Answers:

1. 11000111
2. 10111001
3. 11100011
4. 10011101

89. Which one of the following devices breaks up a Broadcast Domain by default?

Answers:

1. Hub
2. Repeater
3. Router
4. Switch

90. What do you call a communication system in which data cannot be sent in both directions at the same time?

Answers:

1. Half Duplex
2. Full Duplex
3. Asynchronous
4. Synchronous

91. What does ISDN stand for?

Answers:

1. Information Systems Digital Network
2. Integrated Services Digital Network
3. Internet Services Digital Network
4. Internet Systems Data Network

92. How many twisted pairs does a UTP Cat 5 cable have?

Answers:

1. 2
2. 4
3. 6
4. 8

93. According to the OSI model, which layer addresses the issue of switching (packet switching, message switching etc)?

Answers:

1. Session
2. Data Link
3. Presentation
4. Network

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