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Networking 1200 > Module 2.1 - 2.4 Types of Cables > Flashcards

Module 2.1 - 2.4 Types of Cables Flashcards

1
Q

Why are wires twisted in a twisted pair cable?

A

To reduce crosstalk.

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2
Q

What is the purpose of sheathing wires?

A

To further reduce crosstalk and to also protect against EMI.

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3
Q

Most cables contain how many twisted pairs?

A

4

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4
Q

What are some advantages of twisted pair cabling?

A
  • Flexible
  • Cost
  • Ease of use
  • New protocols are designed to to run on them.
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5
Q

What are some disadvantages of twisted pair cabling?

A
  • Susceptible to inference and EMI

- Susceptible to eavesdropping.

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6
Q

What does UTP stand for?

A

Unshielded twisted pair

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7
Q

What does STP stand for?

A

Shielded twisted pair

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8
Q

What is the function of shielding wires in a STP?

A
  • Reduce crosstalk
  • Reduce EMI effects
  • Used as a ground
  • Increase conductivity/speed
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9
Q

What is a plenum space?

A

A part of a building that provides a pathway for the airflow needed by heating and air condition systems, such as above a dropped ceiling or below a raised floor.

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10
Q

What are plenum rated cables?

A

Cables that are fire resistant and non-toxic when burned.

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11
Q

When do you use plenum rated cables?

A

Designed for plenum spaces. These wires must be used since those spaces are a fire hazard. Can also be used for installations that run between floors.

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12
Q

When do you use riser cables?

A

Designed for installations that run between floors.

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13
Q

True or False:

Riser cables can be used in plenum spaces if plenum cables are unavailable.

A

False.

Riser cables should NEVER be used in plenum spaces. Only plenum rated cables should be used in plenum spaces.

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14
Q

Which cable should be used if you need a cable that has to be moved a lot, such as in a mobile setting?

A

A stranded cable as they are more flexible and less prone to break.

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15
Q

Which cable should be used in permanent or semi-permanent installations?

A

A solid cable since they carry signals better.

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16
Q

Which connector is used for phone cables?

A

RJ11.

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17
Q

What does a phone cable do?

A

A phone cable is used to connect a PC to a phone jack in a wall outlet to establish a dial-up internet connection. It is also used to connect a DSL modem to a telephone network. It has two pairs of twisted cable (a total of 4 wires).

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18
Q

Which kinds of cables use the RJ45 connecter?

A

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

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19
Q

What kind of speed is a Cat 3 designed for?

A

10-megabit Ethernet (10Base-T) or 16-megabit token ring.

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20
Q

What kind of speed is a Cat 5 designed for?

A

Supports 100-megabit Ethernet(100BASE-TX) and ATM networking. Cat 5 specifications also support gigabit (1000 Mb) Ethernet. It does this by having more twists per inch than the Cat 3.

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21
Q

What’s the difference between Cat 5 and Cat 5e?

A

Cat 5e provides better EMI protection.

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22
Q

What is a Cat 6 designed for?

A

Supports 10-Gbps Ethernet (10GBASE-T) and high-bandwidth broadband communications. Most Cat 6 cables include a solid plastic core that keeps the cable from bending too much.

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23
Q

What is a Cat 6a designed for?

A

Provides better protection against EMI and crosstalk than the Cat 6. This provides better performance.

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24
Q

Which was ratified first? The Cat 6a or Cat 7?

A

The Cat 7 was ratified before that Cat 6a.

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25
Q

Which connector does the Cat 7 use?

A

GG45 TERA.

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26
Q

What is the difference between the Cat 7 and Cat 6a?

A

The Cat 7 requires shielding on EACH twisted pair AND the cable as a whole. It also has a difference connector.

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27
Q

How many connectors does the RJ11 have?

A

4, two pairs of wires.

28
Q

What is the RJ11 primarily used for?

A

Telephone wiring.

29
Q

What is the RJ45 primarily used for?

A

Ethernet and some token ring connections.

30
Q

How many connectors does a RJ45 have?

A

8, four pairs of wires.

31
Q

What’s the difference between a RJ45 and RJ48c?

A

The RJ48c is used for specific WAN connections such as a T1 line and is wired differently.

32
Q

True or False:

The GG45 is backwards compatible with the RJ45.

A

True. It has four additional conductors in the corners of the connector that duplicate and replace the four inner pins on the RJ45.

33
Q

True or False:

The TERA in compatible with the RJ45 and GG45.

A

False.

34
Q

Which topology should you use when installing a coaxial cable?

A

A bus topology.

35
Q

Name the layers to a coaxial cable.

A
  • The inner conductor (made from copper or copper coated tin).
  • The outer mech conductor or shield (made of aluminum or tin-coated copper)
  • A PVC plastic insulator which surround the inner conductor and insulates the signal from the mesh conductor.
  • A PVC plastic cable sheath, or jacket, that surrounds and protects the wire.
36
Q

What are some advantages of coaxial cables?

A

Highly resistant to EMI.

Highly resistant to physical DMG.

37
Q

What are some disadvantages of coaxial cables?

A
  • More expensive.
  • Inflexible (difficult to install).
  • Unsupported by newer networking standards.
38
Q

What grade of coaxial cabling is for a 10Base2 Ethernet networking (thinnet)?

A

RG-58

39
Q

What is the resistance rating for a RG-58 grade coaxial cable?

A

50 ohms.

40
Q

What is the use of a grade RG-59 coaxial cable?

A

Cable TV and cable networking.

41
Q

What is the resistance rating for a RG-59 grade coaxial cable?

A

75 ohms

42
Q

What is the use of a grade RG-6 coaxial cable?

A

Cable TB, satellite TV, and cable networking.

43
Q

What is the resistance rating for a RG-6 grade coaxial cable?

A

75 ohms

44
Q

True or False:

The RG-59 and RG-58 coaxial cables are interchangeable.

A

False. The resistance of ohms is different.

45
Q

True or False:

The RG-59 and RG-6 coaxial cables are interchangeable.

A

True. The ohms are the same and they do basically the same thing.

46
Q

What is a F-Type connector?

A

A threaded cable (or compression tool) used for cable and satellite TV connections. Also used to connect a cable modem to a broadband cable connection.

47
Q

What is a BNC connector?

A

A connector that is molded into the cable. It’s used in 10Base2 Ethernet networks.

48
Q

Which optic fiber is better for long distance, single or Multi?

A

Single is better for long distance.

49
Q

What are some advantages to using fiber optics?

A
  • Totally immune to EMI(electromagnetic interference).
  • Highly resistant to eavesdropping.
  • Supports extremely high data transmission rates.
  • Allows greater cable distances without a repeater.
50
Q

What are some disadvantages to fiber optics?

A
  • Very expensive
  • Difficult to work with.
  • Special training required to attach connectors to cables.
51
Q

What is a care of fiber optic cables made of?

A

Glass or plastic.

52
Q

What are the parts of a fiber optic cable?

A

(From inside to out)

Core –> Cladding –> Sheathing

53
Q

What does the cladding do in a fiber optic cable?

A

Maintains the signal in the center of the core as the cable bends.

54
Q

What does sheathing do in a fiber optic cable?

A

Protects the cladding and assists in redirecting the light back to the center of the core.

55
Q

What is the core diameter of a single mode fiber optic cable?

A

8-10.5 microns

56
Q

What is the core diameter of a multi-mode fiber optic cable?

A

50-100 microns

57
Q

How does light travel through a multi-mode fiber optic cable?

A

Multiple light streams enter at slightly different angles. This causes the light to reflect separately from each other, allowing multiple light streams through one cable.

58
Q

Why does a multi-mode fiber optic cable have more trouble with distances than single-mode cables?

A

Because multiple streams of light are shot at different angles, thus increasing the amount of times the light is reflected inside the core. With each rebound, the light loses a small portion of energy, and because multi-mode angles the light to allow more streams, it increases the frequency of reflection, thus increasing the frequency of energy loss.
(Greater Modal dispersion).

59
Q

What is the advantage of multi-mode fiber optics?

A

Higher light gathering capacity simplifies connections and allows lower-cost electronics. It also allows for a much higher amount of data to be transferred at one time.

60
Q

Describe a ST Connector

A
  • Used with single-mode and multi-mode cabling.
  • Has a keyed bayonet-type connector.
  • Also called a push-in and twist connector.
  • Each wire has a separate connector.
  • Nickel plated with a ceramic ferrule to ensure proper
    core alignment and prevent light ray deflection.
  • Mnemonics are Set-and-Twist or Straight Tip.
61
Q

Describe a SC Connector

A
  • Used with single-mode and multi-mode cabling.
  • Has a push-on/pull-off connector that uses a locking
    tab to maintain connection.
  • Each wire has a separate connector.
  • Uses a ceramic ferrule to ensure proper core
    alignment and prevent light ray deflection.
  • Mnemonics are Set-and-Click or Square Connector.
62
Q

Describe a LC Connector

A
  • Used with single-mode and multi-mode cabling.
  • Composed of a plastic connector with a locking tab
    that is similar to a RJ45 connector.
  • A single connector with two ends keeps the two
    cables in place.
  • Uses a ceramic ferrule to ensure proper core
    alignment and to prevent light ray deflection.
  • Is half the size of other fiber optic connectors.
  • Mnemonics are Lift-and-Click or Little Connector.
63
Q

Describe a MTRJ Connector

A
  • Used with single-mode and multi-mode cabling.
  • Composed of a plastic connector with a locking tab.
  • Uses metal guide pins to ensure that it is properly
    aligned.
  • A single connector with one end holds both cables.
  • Uses a ceramic ferrule to ensure proper core
    alignment and prevent light ray deflection.
64
Q

Describe a FC Connector

A
  • Typically used with single-mode cabling.
  • Each wire has a separate connector.
  • Uses a threaded connector.
  • Designed to stay securely connected in environments
    where it may experience physical shock or intense
    vibration.
65
Q

What is WDM?

A

Stands for Wave Division Multiplexing. This joins several light wavelengths onto a single strand of fiber.

66
Q

What is the advantage of WDM?

A
  • This enables light signals in both directions across a
    single fiber.
  • Today’s systems can easily multiplex 160 signals.
  • WDM is mostly used by long-haul and high-speed
    providers.
    -Most WDM systems are designed to be used with
    single-mode fiber.

Networking 1200 (5 decks)

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