Lesson 4

Question 1

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

Answer 1

network media

Question 2

signals can be in the form of

Answer 2

electronic current, microwave, radio or light spectrum energy

Question 3

provides the path for sending and receiving information between computers

Answer 3

network media

Question 4

2 major classification of network media

Answer 4

wired media and wireless media

Question 5

also known as cabled, bounded, or conducted media

Answer 5

wired network media

Question 6

two strands of copper wire twisted around each other

Answer 6

twisted pair cable (tp cable)

Question 7

used for telephone communications, not for transmitting data

Answer 7

cat1

Question 8

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

Answer 8

cat 2-5e

Question 9

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

Answer 9

coaxial cable

Question 10

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

Answer 10

fiber optic cable

Question 11

Factors to consider in choosing the network media

Answer 11

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

Question 12

EMI meaning

Answer 12

Electromagnetic Interference

Question 13

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

Answer 13

Bandwidth

Question 14

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

Answer 14

Attenuation

Question 15

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

Answer 15

Attenuation

Question 16

Wired Media

Answer 16

○ Twisted pair cable
○ Coaxial Cable
○ Fiber Optic Cable

Question 17

Wired Media

Answer 17

○ Twisted pair cable
○ Coaxial Cable
○ Fiber Optic Cable

Question 18

Wireless Media

Answer 18

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

Question 19

carries data in the form of electronic signals

Answer 19

twisted pair cables and coaxial cables

Question 20

carries data in the form of electronic signals

Answer 20

twisted pair cables

Question 21

two types of twisted pair cable

Answer 21

shielded twisted pair and unshielded twisted pair

Question 22

two types of twisted pair cable

Answer 22

shielded twisted pair and unshielded twisted pair

Question 23

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

Answer 23

Cat6

Question 24

Comparison between STP and UTP

Answer 24

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

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

Question 25

advantages of tp cable

Answer 25

- 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

Question 26

disadvantages of tp cable

Answer 26

•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

Question 27

Thin Coaxial Cable (RG-58)

Answer 27

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

Question 28

● Thick Coaxial Cable(RG-8)

Answer 28

○ Diameter is about 1.27 cm ○ Attenuation is 500 m

Question 29

● Thick Coaxial Cable(RG-8)

Answer 29

○ Diameter is about 1.27 cm ○ Attenuation is 500 m

Question 30

advantages of coaxial cable

Answer 30

○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

Question 31

Disadvantages of coaxial cable

Answer 31

○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

Question 32

Single mode fiber optic cable

Answer 32

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

Question 33

multimode fiber optic cable

Answer 33

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

Question 34

advantages of fiber optic cable

Answer 34

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

Question 35

disadvantages of fiber optic cable

Answer 35

○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