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CNT 210 > Module 4 > Flashcards

Module 4 Flashcards

1
Q

Devices on a wireless network must be connected to a……

A

wireless access point (AP) or wireless router

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2
Q

3 components of an access point:

A

The wireless antennas
Several Ethernet switchports
An internet port

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3
Q

Ethernet NICs are used for a…

A

wired connection

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4
Q

wireless local area network (WLAN) NICs are used for

A

wireless connections

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5
Q

Provides the means to transport the bits that make up a data link layer frame across the network media.

A

The OSI Physical Layer

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6
Q

The physical layer encodes the frames and creates the _____, _______. or _______ signals that represent the bits in each frame.

A

electrical
optical
radio wave

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7
Q

The ____________ retrieves these individual signals from the media, restores them to their bit representations, and passes the bits up to the data link layer as a complete frame.

A

Destination node physical layer

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8
Q

True or false? The physical layer is only concerned with wired network connections.

A

False

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9
Q

True or false? When a frame is encoded by the physical layer, all bits are sent over the media at the same time.

A

False

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10
Q

The physical layer of the receiving device passes bits up to what higher level layer?

A

Data Link Layer

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11
Q

PDU acronym?

Define.

A

Protocol Data Unit.

A specific block of information transferred over a network.

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12
Q

What PDU is received by the physical layer for encoding and transmission?

A

Frame.

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13
Q

ISO acronym.

A

International Organization for Standardization

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14
Q

TIA/EIA acronym.

A

Telecommunications Industry Association/Electronic Industries Association

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15
Q

ITU acronym.

A

International Telecommunication Union

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16
Q

ANSI acronym.

A

American National Standards Institute

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17
Q

IEEE acronym.

A

Institute of Electrical and Electronics Engineers

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18
Q

FCC acronym.

A

Federal Communication Commission

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19
Q

ETSI acronym.

A

European Telecommunications Standards Institute

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20
Q

The TCP/IP standards are implemented in software and governed by the……..

A

IETF (Internet Engineering Task Force)

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21
Q

IETF acronym.

A

Internet Engineering Task Force.

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22
Q

The physical layer standards are implemented in hardware and are governed by many organizations including… (5)

A 
ISO
EIA/TIA
ITU-T
ANSI
IEEE
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23
Q

The physical layer standards address three functional areas:

A

Physical Components.
Encoding.
Signaling.

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24
Q

A method of converting a stream of data bits into a predefined “code”

A

Encoding or Line Encoding.

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25
Q

Groupings of bits used to provide a predictable pattern that can be recognized by both the sender and the receiver.

A

Codes

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26
Q

The way that bits are represented is called the….

A

Signaling Method.

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27
Q

Data transfer is usually discussed in terms of…

A

Bandwidth.

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28
Q

The capacity at which a medium can carry data.

A

Bandwidth.

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29
Q

Measures the amount of data that can flow from one place to another in a given amount of time.

A

Digital Bandwidth.

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30
Q

Two factors that determine the practical bandwidth of a network:

A

The properties of the physical media.

The technologies chosen for signaling and detecting network signals.

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31
Q

The fundamental unit of bandwidth.

A

bps (Bits per second)

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32
Q

Three terms used to measure the quality of bandwidth…

A

Latency.
Throughput.
Goodput.

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33
Q

The amount of time, including delays, for data to travel from one given point to another.

A

Latency.

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34
Q

The measure of the transfer of bits across the media over a given period of time.

A

Throughput.

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35
Q

Three factors that influence throughput:

A

The amount of traffic.

The type of traffic.

The latency created by the number of network devices encountered between source and destination.

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36
Q

The measure of usable data transferred over a given period of time.

A

Goodput.

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37
Q

Throughput minus traffic overhead for establishing sessions, acknowledgments, encapsulation, and re-transmitted bits.

A

Goodput.

38
Q

_______ is always lower than throughput, which is generally lower than the bandwidth.

A

Goodput.

39
Q

Which media uses patterns of microwaves to represent bits?

A

Wireless.

40
Q

Which media uses patterns of light to represent bits?

A

Fiber-Optic.

41
Q

Which media uses electrical pulses to represent bits?

A

Copper.

42
Q

Which of these is the name for the capacity of a medium to carry data?

A

Bandwidth.

43
Q

Which of these is a measure of the transfer of bits across the media?

A

Throughput.

44
Q

Signals that can distort and corrupt the data signals being carried by copper media.

A

Electromagnetic Interference (EMI).

Radio Frequency Interference (RFI).

45
Q

A disturbance caused by the electric or magnetic fields of a signal on one wire to the signal in an adjacent wire.

A

Crosstalk.

46
Q

To counter the negative effects of EMI and RFI, some types of copper cables are wrapped in __________ and require proper grounding connections.

A

Metallic Shielding.

47
Q

The susceptibility of copper cables to electronic noise can also be limited using these recommendations… (3)

A

Selecting the cable type or category most suited to a given networking environment.

Designing a cable infrastructure to avoid known and potential sources of interference in the building structure.

Using cabling techniques that include the proper handling and termination of the cables.

48
Q

Three main types of copper media used in networking…

A

Unshielded Twisted-Paid (UTP) cable.

Shielded Twisted-Pair (STP) Cable.

Coaxial Cable.

49
Q

The most common networking media.

A

Unshielded twisted-pair (UTP)

50
Q

3 key characteristics of UTP cable.

A

The outer jacket protects the copper wires from physical damage.

Twisted-pairs protect the signal from interference.

Color-coded plastic insulation electrically isolates wires from each other and identifies each pair.

51
Q

Cables that combine the techniques of shielding to counter EMI and RFI, and wire twisting to counter crosstalk.

A

STP. Shielded Twisted-Pair.

52
Q

This cable is used in Wireless installations and Cable internet installations.

A

Coaxial Cable.

53
Q

Cable that has two conductors that share the same axis.

A

Coaxial Cable.

54
Q

4 key features of coaxial cable…

A

Outer jacket.
Braided copper shielding.
Plastic insulation.
Copper conductor.

55
Q

Which attaches antennas to wireless devices? It can also be bundled with fiber-optic cabling for two-way data transmission.

A

coaxial.

56
Q

Which counters EMI and RFI by using shielding techniques and special connectors?

A

STP

57
Q

Which of the following is the most common network media?

A

UTP

58
Q

Which of the following terminates with BNC, N type and F type connectors?

A

Coaxial

59
Q

What is it called when two wires are placed close together, and their magnetic fields are the exact opposite of each other?

A

Cancellation

60
Q

The most common type of networking cable. It is commonly used to interconnect a host to a switch and a switch to a router.

A

Ethernet Straight-through.

61
Q

A cable used to interconnect similar devices.

A

Ethernet Crossover.

62
Q

Connects a workstation serial port to a router console port, using an adapter.

A

Rollover

63
Q

Which fiber-optic cable types can help data travel approximately 500 meters?

A

multimode

64
Q

Which fiber-optic cable types use light emitting diodes (LEDs) as a data light source transmitter?

A

multimode

65
Q

Which fiber-optic cable types use lasers in a single stream as a data light source transmitter?

A

single-mode

66
Q

Which fiber-optic cable types is used to connect long-distance telephony and cable TV applications?

A

single-mode

67
Q

Which fiber-optic cable types can travel approximately 100 km?

A

single-mode

68
Q

Which fiber-optic cable types is used within a campus network?

A

multimode

69
Q

Fiber-optic cables are broadly classified into two types:

A

Single-mode fiber (SMF)

Multimode fiber (MMF)

70
Q

Cable that transmits data over longer distances and at higher bandwidths than any other networking media.

A

Optical Fiber.

71
Q

Fiber optic cable that consists of a very small core and uses expensive laser technology to send a single ray of light

A

Single-Mode Fiber (SMF)

72
Q

Fiber optic cable that consists of a larger core and uses LED emitters to send light pulses.

A

Multimode Fiber (MMF)

73
Q

These concentrate the wireless signals from users and connect to the existing copper-based network infrastructure, such as Ethernet.

A

Wireless Access Point (AP)

74
Q

These provide wireless communication capability to network hosts.

A

Wireless NIC adapters.

75
Q

True or false. Wireless is not well suited for enterprise networks.

A

False.

76
Q

True or false. Wireless LANs operate in full-duplex allowing all devices to send or receive data at the same time so the number of users does not impact performance.

A

False.

77
Q

Which wireless standards is best suited for industrial and IoT environments?

A

Zigbee

78
Q

Which wireless standards is used for Personal Area Networks (PANs) and allows devices to communicate over distances of 1 to 100 meters?

A

Bluetooth.

79
Q

A network administrator is troubleshooting connectivity issues on a server. Using a tester, the administrator notices that the signals generated by the server NIC are distorted and not usable. In which layer of the OSI model is the error categorized?

A

Physical Layer.

80
Q

What type of cable is used to connect a workstation serial port to a Cisco router console port?

A

rollover.

81
Q

Why are two strands of fiber used for a single fiber optic connection?

A

They allow for full-duplex connectivity.

82
Q

Which procedure is used to reduce the effect of crosstalk in copper cables?

A

Twisting opposing circuit wire pairs together.

83
Q

What is one advantage of using fiber optic cabling rather than copper cabling?

A

It is able to carry signals much farther than copper cabling.

84
Q

Connection recommended if the end-user device needs mobility when connecting to the network.

A

Wireless Connection.

85
Q

Which type of UTP cable is used to connect a PC to a switch port?

A

straight-through

86
Q

What is the definition of bandwidth?

A

The amount of data that can flow from one place to another in a given amount of time.

87
Q

What converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits.

A

Frame Encoding.

88
Q

Cancellation is a characteristic of which type of what?

A

UTP cabling.

89
Q

What is the purpose of the OSI physical layer?

A

Transmitting bits across the local media.

90
Q

The distortion of the transmitted messages from signals carried in adjacent wires describes what?

A

Crosstalk.

91
Q

The measure of the bits transferred across the media over a given period of time describe what?

A

Throughput.

92
Q

Which standards organization oversees development of wireless LAN standards?

A

IEEE

CNT 210 (11 decks)

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