Lesson 4 Flashcards

1
Q

carries the data in the form of signals between two or more computers

A

network media

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2
Q

signals can be in the form of

A

electronic current, microwave, radio or light spectrum energy

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3
Q

provides the path for sending and receiving information between computers

A

network media

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4
Q

2 major classification of network media

A

wired media and wireless media

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5
Q

also known as cabled, bounded, or conducted media

A

wired network media

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6
Q

two strands of copper wire twisted around each other

A

twisted pair cable (tp cable)

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7
Q

used for telephone communications, not for transmitting data

A

cat1

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8
Q

4 mbps > 10 mbps > 16 mbps > 100 mbps > 1000 mbps/1gbps

A

cat 2-5e

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9
Q

consists of a center wire surrounded by insulation then a grounded shield of braided wire

A

coaxial cable

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10
Q

type of wired media carries data in the form of modulated pulses of light

A

fiber optic cable

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11
Q

Factors to consider in choosing the network media

A

Cost, ease of installation, flexibility, resistance to interference or EMI, speed or capacity or bandwidth, attenuation

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12
Q

EMI meaning

A

Electromagnetic Interference

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13
Q

refers to the amount of data that can be transmitted in a fixed amount of
time

A

Bandwidth

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14
Q

capacity of the cable to transfer signal from one point to another

A

Attenuation

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15
Q

capacity of the cable to transfer signal from one point to another

A

Attenuation

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16
Q

Wired Media

A

○ Twisted pair cable
○ Coaxial Cable
○ Fiber Optic Cable

17
Q

Wired Media

A

○ Twisted pair cable
○ Coaxial Cable
○ Fiber Optic Cable

18
Q

Wireless Media

A

○ Wireless LAN
○ Extended LAN
○ Mobile Computing
○ Wireless PAN

19
Q

carries data in the form of electronic signals

A

twisted pair cables and coaxial cables

20
Q

carries data in the form of electronic signals

A

twisted pair cables

21
Q

two types of twisted pair cable

A

shielded twisted pair and unshielded twisted pair

22
Q

two types of twisted pair cable

A

shielded twisted pair and unshielded twisted pair

23
Q

consists of
four pairs of 24 American Wire Gauge
(AWG) copper wires.

24
Q

Comparison between STP and UTP

A

STP:
10 to 100mbps
moderately expensive
medium to large connector
100m (short)

UTP
10 to 1000mbs
least expensive
small
100m (short)

25
advantages of tp cable
- Availability and relatively low cost - - - Ease of installation - Excellent spatial efficiency (high transmission capacity in very small cable) - Good information-carrying capacity (transmission rates of 1 Gigabit per second at 100 meters for Category 6 twisted pair cable) - Application independent cabling
26
disadvantages of tp cable
•Relatively low transmission rates it provides for long-distance links •Unsuitable for very high-speed data transmission •Susceptibility to signal distortion or error due to interferences
27
Thin Coaxial Cable (RG-58)
○ Diameter is about 0.64 cm ○ Attenuation is 185 m (sometimes rounded of to 200 m)
28
● Thick Coaxial Cable(RG-8)
○ Diameter is about 1.27 cm ○ Attenuation is 500 m
29
● Thick Coaxial Cable(RG-8)
○ Diameter is about 1.27 cm ○ Attenuation is 500 m
30
advantages of coaxial cable
○Immunity to interference such as noise or signal distortion better than twisted pair cables ○Reasonable cost over short distances ○Standards and technology are mature which promotes compatibility and interoperability of different vendor’s equipment ○Heavier coaxial cable is relatively strong and resists rough treatment
31
Disadvantages of coaxial cable
○Lack of security ○Low data transmission rates compared to twisted pair and fiber optic cable ○Must be kept dry to prevent excessive leakage between the two conductors
32
Single mode fiber optic cable
Fastest fiber optic technique; the lights is guided down the center of an extremely narrow core
33
multimode fiber optic cable
Refracts the light toward the center of the fiber by variations in the density of the core
34
advantages of fiber optic cable
○Very low error rates ○Faster transmission rate ○Immunity to environmental interference ○High attenuation
35
disadvantages of fiber optic cable
○Costly for short distances ○Complex to configure and install ○Needs specialized training/education in order to install ○Possesses the inability to add new nodes while other nodes are active