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Computer Networking > Lesson 4 > Flashcards

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.

A

Cat6

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
Q

advantages of tp cable

A
  • 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
Q

disadvantages of tp cable

A

•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
Q

Thin Coaxial Cable (RG-58)

A

○ Diameter is about 0.64 cm
○ Attenuation is 185 m (sometimes rounded of to 200 m)

28
Q

● Thick Coaxial Cable(RG-8)

A

○ Diameter is about 1.27 cm
○ Attenuation is 500 m

29
Q

● Thick Coaxial Cable(RG-8)

A

○ Diameter is about 1.27 cm
○ Attenuation is 500 m

30
Q

advantages of coaxial cable

A

○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
Q

Disadvantages of coaxial cable

A

○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
Q

Single mode fiber optic cable

A

Fastest fiber optic technique; the
lights is guided down the center of an
extremely narrow core

33
Q

multimode fiber optic cable

A

Refracts the light toward the center
of the fiber by variations in the
density of the core

34
Q

advantages of fiber optic cable

A

○Very low error rates
○Faster transmission rate
○Immunity to environmental interference
○High attenuation

35
Q

disadvantages of fiber optic cable

A

○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

Computer Networking (7 decks)

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