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Networking > Chapter 3 90-93 > Flashcards

Chapter 3 90-93 Flashcards

1
Q

what is noise?

A

Noise – any undesirable influence that degrades or distorts a signal

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2
Q

What is EMI

A

EMI electromagnetic interference. Waves from electrical devices or cables carrying electricity

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3
Q

What is RFI?

A

RFI radio frequency interference – caused by radio waves

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4
Q

What is affected more, analog or digtital?

A

Analog is affected more from EMI

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5
Q

What is cross talk

A

when signals travelling on one wire or cable infringes on the signal on another wire

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6
Q

what is alien cross talk?

A

when cross talk occurs between two cables

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7
Q

What is NEXT

A

near end cross talk – cross talk at the source of the signal, usually from damaged wires

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8
Q

How is cross talk on phone lines different from data lines?

A

you can still understand on a phone line, but data lines will mess up the data message

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9
Q

what is db?

A

decibel, this is the measure used to show how much noise on a line

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10
Q

what is attenuation?

A

the loss of signal strength during transmission

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11
Q

how can analog communication be boosted?

A

through an amplifier

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12
Q

what is an amplifier?

A

a device that increases voltage or strength of the signal

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13
Q

what can be a problem with an amplifier?

A

the distortion caused by noise is also amplified

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14
Q

what is a repeater

A

a repeater regenerates the digital signal, so it is retransmitted w/o the noise

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15
Q

what are amplifiers and repeaters used for?

A

they extend the range of the network

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16
Q

on what OSI level are they found

A

the physical layer

17
Q

what is latency?

A

latency is the time it takes for the electrons in the wires to move to the source of saving your file.

18
Q

what affects latency?

A

the length of wire, interconnected devices ie routers, modems (hubs are less slow than a modem)

19
Q

how is a hub different from a modem?

A

a modem demodulates or modulates a signal, but a hub repeats a signal

20
Q

how do you calculate a networks latency?

A

you do RTT round trip time

21
Q

what is RTT

A

how long it takes for a packet to go from sender to receiver, then back again.

22
Q

how is RTT measured

A

milliseconds

Networking (11 decks)

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