Computer Networking – Data-Link Layer Wired Networks MCQs

1. Communication at the data-link layer is ___________________.

2. Which of the following best describes a single-bit error?

3. Which error detection method uses one's complement arithmetic?

4. Which error detection method consists of just one redundant bit per data unit?

5. Which error detection method involves polynomials?

6. If the ASCII character G is sent and the character D is received, what type of error is this?

7. If the ASCII character H is sent and the character L is received, what type of error is this?

8. In cyclic redundancy checking, what forms the check bits?

9. In CRC, if the dataword is 111111, the divisor 1010, and the remainder 110, what is the codeword at the receiver?

10. In CRC, if the dataword is 111111 and the divisor 1010, what is the dividend at the sender?

11. At the CRC generator, _______ is (are) added to the dataword after the division process to create the codeword.

12. The sum of the checksum and data at the receiver is _______ if no error is detected.

13. In CRC, the quotient at the sender _______.

14. At the CRC checker, _______ means that the dataword is damaged.

15. HDLC is an acronym for _______.

16. The shortest frame in HDLC protocol is usually the _______ frame.

17. The address field of a frame in HDLC protocol contains the address of the _______ station.

18. The HDLC _______ field defines the beginning and end of a frame.

19. What is present in all HDLC control fields?

20. According to the PPP transition phases diagram, options are negotiated in the _______ state.

21. According to the PPP transition phases diagram, verification of user identification occurs in the _______ state.

22. In the PPP frame, the _______ field defines the contents of the data field.

23. In the PPP frame, the _______ field is similar to that of the U-frame in HDLC.

24. In the PPP frame, the _______ field has a value of 11111111 to indicate the broadcast address of HDLC.

25. In PPP, what is the purpose of LCP packets?

26. In the PPP frame, the _______ field is for error control.

27. For CHAP authentication, the user takes the system's _______ and its own _______ to create a result that is then sent to the system.

28. In the _______ random-access method collision is avoided.

29. In the 1-persistent approach, when a station finds an idle line, it _______.

30. _______ requires one primary station and one or more secondary stations.

31. In the p-persistent approach, when a station finds an idle line, it _______.

32. The 1-persistent approach can be considered a special case of the p-persistent approach with p equal to _______.

33. In the reservation access method, if there are 10 stations on a network, then there are _______ reservation minislots in the reservation frame.

34. _______ is a controlled-access protocol.

35. _______ is (are) a channelization protocol.

36. In the _______ random-access method, stations do not sense the medium.

37. A ________ is a local address. Its jurisdiction is over a local network.

38. If the sender is a host and wants to send a packet to another host on the same network, the logical address that must be mapped to a physical address is ______.

39. If the sender is a host and wants to send a packet to another host on another network, the logical address that must be mapped to a physical address is ______.

40. The sender is a router that has received a datagram destined for a host on another network. The logical address that must be mapped to a physical address is ______.

41. The sender is a router that has received a datagram destined for a host in the same network. The logical address that must be mapped to a physical address is ______.

42. An ARP reply is normally _______.

43. An ARP request is normally _______.

44. Given the Ethernet address 01011010 00010001 01010101 00011000 10101010 00001111 in binary, what is the address in hexadecimal notation?

45. If an Ethernet destination address is 07:01:02:03:04:05, then this is a ______ address.

46. If an Ethernet destination address is 08:07:06:05:44:33, then this is a ______ address.

47. Which of the following could not be an Ethernet multicast destination address?

48. Which of the following could not be an Ethernet unicast destination address?

49. The _______ layer of Ethernet consists of the LLC sublayer and the MAC sublayer.

50. The _____ sublayer is responsible for the operation of the CSMA/CD access method and framing.

51. Each station on an Ethernet network has a unique _______ address imprinted on its network interface card (NIC).

52. The minimum frame length for Ethernet is _______ bytes.

53. Fast Ethernet has a data rate of ________ Mbps.

54. In _________, autonegotiation allows two devices to negotiate the mode or data rate of operation.

55. Gigabit Ethernet has a data rate of ________ Mbps.

56. In Ethernet addressing, if the least significant bit of the first byte is 0, the address is _________.

57. In Ethernet addressing, if the least significant bit of the first byte is 1, the address is _________.

58. In Ethernet addressing, if all the bits are 1s, the address is _________.

59. In the Ethernet, the _______ field is actually added at the physical layer and is not (formally) part of the frame.

60. In the Ethernet frame, the _______ field contains error detection information.

61. A VLAN as a local area network configured by_____________.

62. The largest portion of the bandwidth for ADSL carries _______.

63. Another name for the cable TV office is the _______.

64. A traditional cable TV network transmits signals ______.

65. The original telephone network, which is referred to as the plain old telephone system (POTS), was a (an) ________ system.

66. The traditional cable TV system used ________ cable end to end.

67. The second generation of cable networks is called a(n) _________ network.

68. The HFC network uses _______ cable.

69. To use a cable network for data transmission, we need two key devices: a ______ and a _________

70. A (An) ______ signal is the corresponding optical signals of an electrical signal level STS-n.

71. SONET uses _______ TDM multiplexing.

72. A SONET system can use _________.

73. SONET sends ________ frames per second

74. In SONET, a ________ is a repeater.

75. In SONET, __________ allow insertion and extraction of signals.

76. In SONET, for each byte, the bits are transmitted ____________.

77. ________ is the cell relay protocol designed by the corresponding Forum and adopted by the ITU-T.

78. The ATM standard defines ______ layers.

79. An ATM data unit is a cell composed of ______ bytes.

80. In ATM, a(n) ______ is the interface between a user and an ATM switch.

81. In ATM, a(n) _________ is the interface between two ATM switches.

82. In ATM, the _______ layer accepts transmissions from upper-layer services and maps them into cells.

83. In ATM, the ______ layer provides routing, traffic management, switching, and multiplexing services.

84. A repeater is a connecting device that operates in the _______ layer(s).

85. A link-layer switch is a connecting device that operates in the _______ layer(s).

86. A router is a connecting device that that operates in the _______ layer(s).

87. A _________ has no filtering capability.

88. A three-layer switch is a __________.