MODULE 4

Question 1

Before a network communication can occur, a - must be established

Answer 1

physical connection

Question 2

this connects a device to a network

Answer 2

nic (network interface card)

Question 3

this transports bits across the network media and accepts a complete frame from the data link layer to be encoded as a series of signals

Answer 3

physical layer

Question 4

this is the last step of the encapsulation process

Answer 4

encoding into bits in the physical layer

Question 5

physical layer protocols

Answer 5

iso, eia/tia, itu-t, ansi, ieee

Question 6

converts the stream of bits into a format recognizeable by the next device in the network path

Answer 6

encoding

Question 7

this is how the bit values of 1 and 0 are represented on the physical medium

Answer 7

signaling

Question 8

capacity at which a medium can carry data

Answer 8

bandwidth

Question 9

measures the amout of data that can flow from one place to another in a given amount of time; how many bits can be transmitted in a second

Answer 9

digital bandwidth

Question 10

fundamental unit of bandwidth

Answer 10

1 bos (bit per second)

Question 11

1 kbps =

Answer 11

1000 bps = 103 bps

Question 12

1 mbps =

Answer 12

1000000 bps = 106 bps

Question 13

1 gbps =

Answer 13

1000000000 bps = 109 bps

Question 14

1 tbps =

Answer 14

1000000000000 bps = 1012 bps

Question 15

amount of time, including delays, for data to travel from one given point to another

Answer 15

latency

Question 16

the measure of transfer of bits across the media over a given amount of time

Answer 16

throughput

Question 17

measure of useable data transferred over a given period of time

Answer 17

goodput

Question 18

formula for goodput

Answer 18

throughput - traffic overhead

Question 19

most common type of cabling used in networks todat; inexpensive, easy to install, and has low resistance to electrical current flow

Answer 19

copper

Question 20

limitation of copper: the longer the electrical signals have to travel , the weaker they get

Answer 20

attemtuwtion

Question 21

2 interferences that copper wiring is susceptible to

Answer 21

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

Question 22

mitigation for attentuation of copper wiring

Answer 22

cable length limits

Question 23

mitigation for EMI and RFI in copper wiring

Answer 23

metallic shielding / grounding

Question 24

some types of copper cables mitigate crosstalk through this

Answer 24

twisting opposing circuit wires together

Question 25

3 types of copper cabling

Answer 25

unshielded twisted pair, shielded teisted pair, coaxial

Question 26

most common networking media; interconnects host with intermediary network devices

Answer 26

UTP

Question 27

this terminates utp cables

Answer 27

rj45

Question 28

this protects copper wires from physical damage

Answer 28

outer jacket

Question 29

protects signals from interference

Answer 29

twisted pairs

Question 30

isolates wires frrom each other and identifies each pair

Answer 30

color-coded plastic insulation

Question 31

Has better noise protection UTC, than more expensive, and harder to install

Answer 31

Shielded twisted pair (stp)

Question 32

Protects the copper wives from physical damage in strength pairs

Answer 32

Outer jacket

Question 33

4 components of coaxial cable

Answer 33

Outer cable jacket,woven copper braind, flexible plastic insulation,copper conductor

Question 34

coaxial cables are commonly ised in these 2 situations

Answer 34

wireless installations, cable internet installations

Question 35

this has 4 pairs of color coded copper wires twisted together and encased in flexible plastic

Answer 35

utp

Question 36

property of utp against crosstalk: each wire in a pair of wires uses opposite polarity. they are twisted together and the magnetic fields effecticely cancel each other outside emi/rfi

Answer 36

cancellation

Question 37

property of utp against crosstalk: each wire is twisted a different amount, which helps prevent crosstalk amongst wires in the cables

Answer 37

variation in twists per foot

Question 38

application and standards lf straight through ethernet cable

Answer 38

host to network device; both ends t568a/t568b

Question 39

application and standards of crossover ethernet cable

Answer 39

connecting same devices; t568a - t568b

Question 40

this is not as common as utp because of the expense invilved; transmits data over long distances ar higher bandwidths than any other networking media

Answer 40

fiber#optic cabling

Question 41

2 types of fiber obtic cabling

Answer 41

single mode fiber, multimode fiber

Question 42

fiber media: very small core, uses expensive lasers, long distance applications

Answer 42

single mode fiber

Question 43

fiber media: larger core, uses less expensive leds, leds transmit at different angles, 10gbps over 550 meters

Answer 43

multimode fiber

Question 44

refers to the spreading out of a light pulse over time. increase of thid means increased loss of signal strength

Answer 44

dispersion

Question 45

true or false: smf has greater dispersion than mmf

Answer 45

false

Question 46

fiber optic cabling industry: used for backbone cabling applications and interconnecting infrastructure devices

Answer 46

enterprise networks

Question 47

fiber optic cable industry: used to provide slways-on broadband services to homes and small businesses

Answer 47

fiber home to home (ftth)