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Network+ > Chapter 2: Cabling and Topology > Flashcards

Chapter 2: Cabling and Topology Flashcards

1
Q

Topologies

A

Ways of connecting computers and other devices

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2
Q

Which are the historical topologies?

A

Bus, star, and ring

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3
Q

Bus topology

A

Single cable that connected all computers in a line

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4
Q

Ring topology

A

Connected all computers with a ring of cable

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5
Q

What does a bus network need at the end of the cables to prevent a signal from reflecting ?

A

Termination

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6
Q

What was the weakness of both bus and ring topologies?

A

The entire network stopped working if the cable broke at any point

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7
Q

Star topology (hub-and-spoke)

A

All computers on the network are connected to a central connection box

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8
Q

What was the benefit of the star topology ?

A

Offered fault taulerance

If a cable broke, all of the other computers could still communicate

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9
Q

Physical topology

A

How the cables physically look

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10
Q

Logical topology or signaling topology

A

How the signal travels electronically

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11
Q

Hybrid topology

A

Any form of networking technology that combines a physical and logical topology

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12
Q

Which reigns supreme? Star-bus or star-ring ?

A

Star-bus

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13
Q

Mesh topology

A

Wireless networks where every computer connects to every other computer via two or more routes

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14
Q

Partially meshed topology

A

At least two redundant connections

Every machine doesn’t connect to every other machine

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15
Q

Fully meshed topology

A

Every computer connects to every other computer

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16
Q

Network technology

A

Practical application of a topology and other critical tools that provides a method to get data from one computer to another on a network

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17
Q

What are the two distinct groups of cabling in the networking industry?

A

Fiber and copper

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18
Q

What are the two primary types of copper cabling ?

A

Coaxial and twisted pair

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19
Q

Coaxial cable

A

Central copper conductor wire surrounded by an insulating material which is surrounded by a braided metal shield

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20
Q

What is the outer mesh layer of the coaxial cable for ?

A

To shield the center wire from EMIs

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21
Q

Where are coaxial cables used ?

A

Connecting a computer to a cable modem. Also connects to satellite receiver and cable TV

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22
Q

Which connector screws on for a secure connection ?

A

F-type connector

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23
Q

Which is the primary calbing used today between RG-59 and RG-6?

A

RG-6 because it is more robust

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24
Q

Impedance

A

How much a cable resists the flow of electricity

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25
Q

How do you get both television and the internet from cable ?

A

Coaxial splitters

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26
Q

Twinaxial cable

A

Contains two central copper conductors. Substitute for fiber in short connections

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27
Q

Another name for twinaxial ?

A

Direct attached cable (DAC)

28
Q

What is the most common type of cabling used in networking?

A

Twisted pair

29
Q

What interference is reduced with a twisted pair cable ?

A

Crosstalk

30
Q

Shielded twisted pair (STP)

A

Twisted pairs of wires surrounded by shielding to protect from EMI

31
Q

Unshielded twisted pair (UTP)

A

Twisted pairs of wire surrounded by a plastic jacket

32
Q

Does the UTP plastic jacket protect from EMI ?

A

No

33
Q

Category(cat) ratings

A

Variety of grades for twisted pair rated in megahertz (MHz) indicating the highest frequency the cable can handle

34
Q

What are the TIA recognized cat rating cables ?

A

Cat 3, Cat 5e, Cat 6, Cat 6a

35
Q

What are the groups that set the standards for cabling and networking in general? Top to bottom

A

International Organization for Standardization (ISO), American National Standards Institute (ANSI), Telecommunications Industry Association (TIA)

36
Q

Bandwidth

A

Maximum amount of data that can travel through the cable per second

37
Q

Each cycle per second (or hertz) accounts for ______ per second ?

A

Data

38
Q

Bandwidth-efficient encoding schemes

A

Squeeze more bits into the same signal as long as the cable can handle it

39
Q

Which cables are used to future proof the network ?

A

Cat 6a or Cat 7

40
Q

8P8C

A

8 position 8 contact

41
Q

What is 8P8C referred as ?

A

RJ-45 connectors

42
Q

Fiber optic cable

A

Transmits light. Attractive for high EMI areas and long distance transmissions

43
Q

Four components of fiber ?

A

Glass fiber itself (core), cladding (reflects light down the fiber), buffer (material for strength), and insulating jacket

44
Q

What are some common fiber optic micrometer cable sizes ?

A

9/125, 50/125, and 62.5/125 micrometer um

45
Q

Do network technologies require pairs of fiber optic cable ?

A

Yes, one fiber cable for sending, the other for receiving

46
Q

Duplex fiber optic cabling

A

Two stands of plastic or glass fiber where separate transmission and receiving are required

47
Q

Multimode fiber (MMF)

A

Fiber optic cable that uses LEDs

48
Q

Single-mode fiber (SMF)

A

Fiber optic cables using lasers

49
Q

Single-mode fiber (SMF)

A

Fiber optic cables using lasers

50
Q

What does SMF prevent, which is a unique problem for MMF ?

A

Modal distortion

Signals are sent at the same time that don’t arrive at the same time because paths differ slightly in length

51
Q

Wavelength for MMF cables ? (In nanometers)

A

Transmit 850 nm or 1300 nm wavelengths

52
Q

Wavelengths for SMF cables ?

A

1310 nm or 1550 nm depending on the laser

53
Q

What are the MMF standard prefixes ?

A

OM1, OM2, OM3, OM 4, OM5

54
Q

Which OM are for short runs using LEDs

A

OM1 and OM2

55
Q

What can OM3, OM4, and OM5 use for transmitting ?

A

Can use lasers running at higher bandwidths

56
Q

Color coded various fiber types

A

SMF is yellow. OM1 and OM2 are orange. OM3 and OM4 are aqua. OM5 is lime green

57
Q

Four common connector types for fiber ?

A

ST, SC, LC, and MT-RJ

58
Q

Which fiber connectors are always duplex ? Meaning both the send and receive cables are attached.

A

LC and MT-RJ

59
Q

Two most common cabling fire ratings ?

A

PVC and plenum

60
Q

Does PVC have fire protection?

A

No significant protection

61
Q

Benefit and downside of plenum ? Is it required ?

A

Creates less smoke and fumes but costs three to five times more than PVC. Most cities require plenum

62
Q

If cabling is in the walls, which fire rating cabling should be used ?

A

Plenum

63
Q

What committe defines networking standards ?

A

IEEE 802

64
Q

Why was the IEEE 802 broken down into different subcommittees?

A

No one cabling solution would work for all needs

65
Q

What is the most common category of UTP used in new cabling installations

A

Cat 6 for now, but Cat 6a and 7 are gaining popularity

Network+ (8 decks)

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