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Block 1 Unit 11 - Cable Management > 11A > Flashcards

11A Flashcards

1
Q

The _____________ is how data travels from one component or device to another. This can be done by cable or by wireless such as RF or light.

A

physical environment

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2
Q

A LAN using coaxial cable, twisted-pair cable, and/or fiber optic cable is using __________.

A

guided media

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3
Q

Impairments in guided transmission lines can create __________, which degrades the analog and digital signal quality

A

distortion

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4
Q

________________ does not use a physical means but relies instead on
radio waves or light transmissions.

A

Unguided media

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5
Q

_________ cables are the oldest and most used types of transmitting data.

A

Copper

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6
Q

The copper wire in the cables could be ____________ together to form the individual wire in the cable

A

solid or stranded twisted

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7
Q

Twisted-Pair Cable is the ____________ media for network connectivity.

A

most common

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8
Q

Twisted-pair cable consists of…?

A

solid insulated wires twisted in the cable

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9
Q

The twisted-wire configuration limits signal degradation from…?

A

electromagnetic interference (EMI) and radio frequency interference (RFI).

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10
Q

Twisted-pair cable has ____________ governing the number of twists or braids permitted per meter.

A

precise specifications

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11
Q

Twisted-pair is a copper, wire-based cable that can be either ___________.

A

shielded or unshielded

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12
Q

What does UTP stand for?

A

Unshielded Twisted Pair

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13
Q

UTP has become the most ___________ choice among networking cables

A

economical

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14
Q

In most cases, UTP cable is implemented using inexpensive, modular
telephone-type connectors such as the ______ (two pair, common telephone) and the ______ (four pair, data) connectors.

A

RJ-11 and the RJ-45

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15
Q

UTP contains ______ insulated wires.

A

eight

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16
Q

In UTP, ________ are twisted together, a precise number of
turns per meter, to form a pair.

A

two insulated wires

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17
Q

The ANSI specifies categories of UTP in terms of _______ they can sustain.

A

data rates

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18
Q

Categories describe the media as well as the types of ________ to be used.

A

connectors

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19
Q

What are the “pin layouts”?

A

The pin layouts are TIA based standards using the T-586A standard for network cables

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20
Q

What are the three basic configurations for pin layouts?

A

Straight through, cross over, roll over

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21
Q

Describe straight through pin layout

A

Pins on end of the cable match. A Straight Through cable is used to connect two unlike devices, such as a PC to a switch.

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22
Q

Describe cross-over pin layout

A

TX and RX pins are swapped on the opposite end of the cable. A Cross-Over cable is used to connect like devices, such as switch to switch.

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23
Q

Describe roll over pin layout

A

Pins are exactly opposite on the ends of the cables. The Roll Over cable is commonly referred to as a console cable and is used to connect a PC to the console port of a switch or router.

24
Q

What does STP stand for?

A

Shielded Twisted Pair

25
Q

What is STP?

A

STP cable combines the techniques of shielding and twisting of wires to protect against signal degradation.

26
Q

STP contains _____ pairs of wire.

A

four

27
Q

Each pair of wire is twisted together a precise number of turns per meter. Each pair is then wrapped, as a pair, in ______________.

A

insulating metallic foil

28
Q

After being wrapped in metallic foil, the four insulated pairs are then wrapped together in metallic braid or foil called the _______

A

jacket

29
Q

The major benefit of STP is that it reduces…?

A

reduces electrical noise both within the cable (pair-to-pair
crosstalk) and outside the cable (Electromagnetic Interference and Radio Frequency Interference).

30
Q

With fiber optics, technology converts electrical signals (ones and zeros [binary] into ___________ (on and off lighting).

A

optical signals

31
Q

Optical signals are transmitted through a thin glass fiber. These signals are converted back into ________ at the receiving end.

A

electrical signals

32
Q

Because these transmissions are light-based instead of
electrical based, fiber is immune to all types of electromagnetic (EMF) monitoring because…?

A

There is no EM radiation

33
Q

What are the two types of fiber optic cable?

A

Multi-Mode and Single-mode

34
Q

Multi-mode fiber typically has a core diameter of _________.
This relatively large core allows many modes, or paths, of light to propagate down the optic path producing good coupling from inexpensive couplers, connectors, and LED light sources.

A

Multi-mode fiber typically has a core diameter of 50 to 100 microns.

35
Q

Two types of multi-mode fiber exist, which are?

A

graded and stepped

36
Q

Multi-mode fiber supports ________ than twisted-pair wire.

A

longer segment lengths

37
Q

Multi-mode fiber can support segment lengths as long as ______ meters for 10 and 100 Mbps Ethernet, and _____ meters for 1 Gbps Ethernet.

A

2000
550

38
Q

Single mode fiber, shown in Figures 11-5 and 11-6, uses a glass fiber that is approximately _________ in diameter and permits a single mode of light to be propagated using expensive lasers as the light source.

A

10 microns

39
Q

________ can support much longer segments than any other guided media.

A

Single-mode fiber

40
Q

_________ transmissions are wireless.

A

Unguided/unbound

41
Q

_______________ can impair your wireless transmission, degrading both analog and digital signal quality.

A

Atmospheric conditions

42
Q

The most used wireless media are…?

A

light transmissions and radio waves

43
Q

Light transmissions use ______ to transmit and receive network signals.

A

lasers

44
Q

Since laser transmissions use a focused beam of light, they require a _________ and _________ between the devices.

A

clear line of sight and precise alignment

45
Q

Radio waves may be land-based or _____-based transmissions.

A

space-based

46
Q

Radio transmission signals originate from a land-based system but are transmitted to _____________.

A

satellites

47
Q

Radio waves used for networking purposes are typically microwave frequencies in the ____________ range.

A

1-20 gigahertz (GHz)

48
Q

Radio wave signals can be ____________ or _____________ in nature.

A

fixed frequency or spread spectrum

49
Q

With fixed frequency signals, the information you wish to transmit is superimposed onto a RF carrier, which increases ______ and _______ of the signal.

A

power and range

50
Q

Security of fixed frequency signals is poor because…?

A

once the carrier frequency is known, fixed frequency signals are easy to
monitor and/or jam.

51
Q

What is an example of a fixed-frequency signal?

A

a radio station

52
Q

Spread spectrum signals is a transmission technique that transmits a signal across a broad frequency bandwidth and…?

A

varies as the RF carrier frequency varies

53
Q

What are some reasons for using the spread spectrum signals technique?

A

To secure communications, to increase resistance to natural interference, noise, and jamming

54
Q

What are the advantages of unguided media?

A
  1. Mobility - there is no physical cabling to tie down the location of a node on a network; a portable computer can truly be portable
  2. Relocatable - Moving a wireless node is easy compared to the large amount of labor required to add or move cabling in a guided or bound type of network.
55
Q

What are the disadvantages of unguided media?

A
  1. Security: Security is poor. Signals are more susceptible to interception and monitoring.
  2. Distortion and Interference: Susceptible to interference and distortion from lights, electronic devices, and atmospheric conditions.
  3. Speed: Slower speed than guided media LAN’s
56
Q

T-568A standard is what color wire?

A

Green

57
Q

T-568B standard is what color wire?

A

Orange

Block 1 Unit 11 - Cable Management (1 decks)

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