Data-Link Layer MCQs - Computer Networking

This Portion of Computer Networking contains Computer Networking Data-Link Layer Wired Networks MCQs (Multiple Choice Questions and Answers).

This Section covers below lists of topics.

1. INTRODUCTION
• Nodes and Links
• Two Types of Links
• Two Sublayers

2. DATA LINK CONTROL (DLC)
• Framing
• Flow and Error Control
• Error Detection and Correction
• Two DLC Protocols

3. MULTIPLE ACCESS PROTOCOLS
• Random Access
• Controlled Access
• Channelization

4. LINK-LAYER ADDRESSING

5. WIRED LANS: ETHERNET PROTOCOL
• IEEE Project 802
• Standard Ethernet
• Fast Ethernet (100 Mbps)
• Gigabit Ethernet
• 10-Gigabit Ethernet
• Virtual LANs

6. OTHER WIRED NETWORKS
• Point-to-Point Networks
• SONET
• Switched Network: ATM

7. CONNECTING DEVICES
• Repeaters or Hubs
• Link-Layer Switches
• Routers

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

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

end-to-end
node-to-node
process-to-process
None of the choices are correct

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

A single bit is inverted.
A single bit per transmission is inverted.
A single bit per data unit is inverted.
All of the choices are correct

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

Simple parity check
Checksum
Two-dimensional parity check
CRC

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

Two-dimensional parity check
CRC
Simple parity check
Checksum

5. Which error detection method involves polynomials?

CRC
Simple parity check
Two-dimensional parity check
Checksum

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

Single-bit
Multiple-bit
Burst
Recoverable

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

Burst
Recoverable
Single-bit
Multiple-bit

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

The remainder
The divisor
The quotient
The dividend

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

111111011
1010110
111111110
110111111

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

1111110000
111111000
111111
1111111010

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

0s
1s
the remainder
the divisor

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

– 0
+ 0
the complement of the checksum
the complement of the dataword

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

becomes the dividend at the receiver
becomes the divisor at the receiver
is the remainder
is discarded

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

a string of alternating 1s and 0s
a nonzero remainder
a string of 0s
None of the choices are correct

15. HDLC is an acronym for _______.

High-Duplex Line Communication
Half-Duplex Link Combination
High-Level Data Link Control
Host Double-Level Circuit

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

information
management
supervisory
none of the choices are correct

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

primary
secondary
tertiary
primary or secondary

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

control
flag
FCS
None of the choices are correct

19. What is present in all HDLC control fields?

N(R)
N(S)
code bits
P/F bit

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

Networking
Terminating
Establishing
Authenticating

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

Networking
Terminating
Establishing
Authenticating

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

FCS
flag
control
protocol

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

flag
protocol
FCS
control

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

protocol
address
control
FCS

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

Configuration
Termination
Option negotiation
All of the choices are correct

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

FCS
flag
control
protocol

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

authentication identification; password
password; authentication identification
challenge value; password
password; challenge value

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

CSMA/CD
CSMA/CA
ALOHA
token-passing

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

sends immediately
waits 0.1 s before sending
waits 1 s before sending
waits a time equal to (1 - p) seconds before sending

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

token ring
reservation
polling
CSMA

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

sends immediately
waits 1 s before sending
sends with probability 1 - p
sends with probability p

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.

FDMA
TDMA
CSMA
Reservation

35. _______ is (are) a channelization protocol.

FDMA
TDMA
CDMA
All the choices are correct.

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

CSMA/CA
ALOHA
CSMA/CD
Ethernet

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

link-layer address
logical address
port number
None of the choices are correct

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 ______.

the destination IP address in the datagram header
the IP address of the router found in the routing table
the source IP address
None of the choices are correct

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 ______.

the destination IP address in the datagram header
the IP address of the router found in the routing table
the source IP address
None of the choices are correct

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 ______.

the destination IP address in the datagram header
the IP address of the router found in the routing table
the source IP address
None of the choices are correct

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 ______.

the destination IP address in the datagram header
the IP address of the router found in the routing table
source IP address
None of the choices are correct

42. An ARP reply is normally _______.

broadcast
multicast
unicast
None of the choices are correct

43. An ARP request is normally _______.

broadcast
multicast
unicast
None of the choices are correct

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

5A:88:AA:18:55:F0
5A:81:BA:81:AA:0F
5A:18:5A:18:55:0F
5A:11:55:18:AA:0F

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

unicast
multicast
broadcast
either multicast or broadcast

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

unicast
multicast
broadcast
either multicast or broadcast

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

43:7B:6C:DE:10:00
44:AA:C1:23:45:32
46:56:21:1A:DE:F4
48:32:21:21:4D:34

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

B7:7B:6C:DE:10:00
7B:AA:C1:23:45:32
7C:56:21:1A:DE:F4
83:32:21:21:4D:34

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

data link
physical
network
None of the choices are correct.

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

LLC
MII
MAC
None of the choices are correct,

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

16-bit
32-bit
64-bit
None of the choices are correct.

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

32
80
128
None of the choices are correct

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

10
100
1000
10,000

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

Standard
Fast Ethernet
Gigabit Ethernet
Ten-Gigabit Ethernet

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

10
100
1000
10,000

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

unicast
multicast
broadcast
None of the choices are correct.

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

unicast
multicast
broadcast
None of the choices are correct.

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

unicast
multicast
broadcast
None of the choices are correct.

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

CRC
preamble
address
SFD

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

CRC
preamble
address
SFD

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

software
physical wiring
software or physical wiring
None of the choices are correct.

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

voice communication
upstream data
downstream data
control data

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

splitter
fiber node
combiner
head end

64. A traditional cable TV network transmits signals ______.

upstream
downstream
upstream and downstream
None of the choices are correct.

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

digital
analog
digital as well as analog
None of the choices are correct.

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

twisted-pair
coaxial
fiber-optic
None of the choices are correct.

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

HFC
HCF
CFH
None of the choices are correct.

68. The HFC network uses _______ cable.

twisted-pair
coaxial
fiber-optic
a combination of coaxial and fiber-optic

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

CM; CMS
CT; CMTS
CM; CMTS
None of the choices are correct.

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

OC-n
TDM-n
FDM-n
None of the choices are correct.

71. SONET uses _______ TDM multiplexing.

asynchronous
synchronous
statistical
None of the choices are correct.

72. A SONET system can use _________.

STS multiplexers
regenerators
add/drop multiplexers
All of the choices are correct.

73. SONET sends ________ frames per second

1000
2000
4000
8000

74. In SONET, a ________ is a repeater.

regenerator
ADM
STS multiplexer/demultiplexer
None of the choices are correct.

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

regenerators
ADMs
STS multiplexer/demultiplexers
none of the choices are correct

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

from least significant to the most significant
from most significant to the least significant
two at a time
three at a time

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

SONET
ADM
ATM
None of the choices are correct.

78. The ATM standard defines ______ layers.

two
three
four
five

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.

UNI
NNI
NUI
None of the choices are correct.

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

UNI
NNI
NUI
None of the choices are correct.

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

physical
ATM
AAL
None of the choices are correct.

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

physical
ATM
AAL
None of the choices are correct.

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

physical
physical and data link
data link and network
physical, data link and network

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

physical
physical and data link
data link and network
physical, data link and network

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

physical
physical and data link
data link and network
physical, data link and network

87. A _________ has no filtering capability.

repeater
link-layer switch
router
None of the choices are correct.

88. A three-layer switch is a __________.

repeater
link-layer switch
router
None of the choices are correct.

Computer Networking – Data-Link Layer Wired Networks MCQs