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NCS Certification > TEST #2 > Flashcards

TEST #2 Flashcards

1
Q

Which statement regarding NEXT is true?

A. Length is a factor of NEXT

B. NEXT is only measured near the centre of the link-under-test

C. NEXT measures the crosstalk on the link-under-test as the signal that is measured at the receiving end

D. Crosstalk is greatest at the near end (at the sender end)

A

The correct answer is:
Crosstalk is greatest at the near end (at the sender end)

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2
Q

Two multipair cables are to be terminated at the MC. What is the total number of 25 pair connector blocks required to terminate one end of a 900-pair cable and one end of a 300-pair cable?

A. 48

B. 300

C. 96

D. 600

A

The correct answer is: A
48

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3
Q

The difference in the receiving time of the individual modes in an optical fiber causes a distortion of the original signal. What is the distortion in the optical strand called?

A.
Propagation

B.
Attenuation

C.
Dispersion

D.
Scattering

A

The correct answer is: C
Dispersion

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4
Q

Which is the most widely used optical fiber strand for long distance OSP applications?

A.
100/140 micron

B.
9/125 micron

C.
50/125 micron

D.
250/900 micron

A

The correct answer is: B
9/125 micron

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5
Q

When testing for compliance accordingly to the TIA-568-C.2 standard, what is the total number of individual NEXT tests performed on a 4-pair cable?

A. 6

B. 4

C. 12

D. 8

A

The correct answer is: C
12

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6
Q

What is the colour sequence for a modular plug configured for T568B?

A.
W-Blue, Blue-W, W-Green, Green-W, W-Orange, Orange-W, W-Brown, Brown-W

B.
W-Blue, Blue-W, W-Orange, Orange-W, W-Green, Green-W, W-Brown, Brown-W

C.
W-Orange, Orange-W, W-Green, Blue-W, W-Blue, Green-W, W-Brown, Brown-W

D.
W-Green, Green-W, W-Orange, Blue-W, W-Blue, Orange-W, W-Brown, Brown-W

A

The correct answer is: C
W-Orange, Orange-W, W-Green, Blue-W, W-Blue, Green-W, W-Brown, Brown-W

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7
Q

What is the maximum distance two PCs may be connected without a repeater (switch) using OS2 cabling?

A. 3000 meters

B. 10,000 meters

C. 100 meters

D. 1000 meters

A

The correct answer is: A

3000 meters

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8
Q

What is insertion loss?

A.
Insertion loss is the same as attenuation

B.
Insertion loss happens when the output is higher than the input

C.
Insertion loss is the same as return loss

D.
Insertion loss is the amount of light reflected back to the source

A

The correct answer is: A
Insertion loss is the same as attenuation

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9
Q

Which UTP performance characteristic requires the “frequency” is part of the specification?

A. NEXT

B. NVP

C. DC resistance

D. Capacitance

A

The correct answer is: A
NEXT

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10
Q

Which combination of UTP performance characteristics require that “length” is part of the specifications (e.g. 28.7 ohms/1000 ft.)?
Select one:

A. DC resistance, NEXT, and impedance

B. DC resistance, NEXT, and insertion loss

C. DC resistance, insertion loss, and capacitance

D. DC resistance, insertion loss, and impedance

A

The correct answer is: C

DC resistance, insertion loss, and capacitance

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11
Q

Which connector uses a threaded coupling nut?

A.
SFF connector

B.
SC connector

C.
N connector

D.
BNC connector

A

The correct answer is: C
N connector

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12
Q

How is a “Type B” MPO adapter configured?

A. Both keys up

B. One key up, one key down

C. With alignment pins for the connectors

D. With alignment holes for the connectors

A

The correct answer is: A
Both keys up

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13
Q

How is the position of the fiber number 1 of an MPO connector determined?

A.
Viewed from the front, key up, fiber 1 is on the left

B.
Viewed from the front, female connector, fiber 1 is on the right

C.
Viewed from the front, key up, fiber 1 is on the right

D.
Viewed from the front, male connector, fiber 1 is beside the pin

A

The correct answer is:
Viewed from the front, key up, fiber 1 is on the left

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14
Q

Which of the following represents the abbreviation “Gb/s”?
Select one:

A.
Gigahertz per second

B.
Gigabaud per second

C.
Gigabit per second

D.
Gigabyte per second

A

The correct answer is: C
Gigabit per second

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15
Q

What causes echoes (reflections) in a cable?

A.
Signal coupling from other transmission lines

B.
Improperly functioning echo suppressors

C.
Too long a cable length

D.
Impedance mismatches at cable termination points

A

The correct answer is: D
Impedance mismatches at cable termination points

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16
Q

Which wavelengths do laser based networks use?

A.
850 and 1310 nm

B.
1300 and 1550 nm

C.
850 and 1300 nm

D.
1310 and 1550 nm

A

The correct answer is:
1310 and 1550 nm

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17
Q

Which one of the following connectors is recognized by the TIA-568.0-D standard for unshielded twisted pair cabling?

A.
8-position IDC connector

B.
BNC connetor

C.
Universal Data Connector (UDC)

D.
SC connector

A

The correct answer is: A
8-position IDC connector

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18
Q

What does delay skew measurement indicate?

A.
Reception of signals from adjacent pairs

B.
Reflection of the signal on the cable

C.
Displacement of the signal in time

D.
Signal time difference between the fastest and slowest pairs

A

The correct answer is: D
Signal time difference between the fastest and slowest pairs

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19
Q

Which cable is used for CATV systems?

A. RG-6

B. RG-75

C. RG-58

D. RG-8

A

The correct answer is: A
RG-6

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20
Q

What causes light to travel through the core of a fiber?

A.
Numerical aperture

B.
Internal reflection

C.
Dispersion

D.
Inverse refraction

A

The correct answer is: B
Internal reflection

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21
Q

Which type of coaxial connector is installed with out a centre pin?

A. BNC

B. F type

C. TNC

D. N type

A

The correct answer is: B
F type

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22
Q

Which set of cable performance criteria provides better performance?
Select one:

A.
Low dB for crosstalk and low dB for structural return loss

B.
High dB for crosstalk and high dB for structural return loss

C.
High dB for crosstalk and low dB for insertion loss

D.
Low dB for crosstalk and low dB for insertion loss

A

The correct answer is: C
High dB for crosstalk and low dB for insertion loss

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23
Q

What is the typical diameter of the protective coating applied to fiber strands in a loose tube cable?

A. 0.500 mm

B. 0.125 mm

C. 0.900 mm

D. 0.250 mm

A

The correct answer is: D
0.250 mm

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24
Q

A Category 6A cable is terminated at the wall outlet using the T568B configuration. What colour sequence is used for terminating that cable on the second of 6 possible cable positions of a 25 pair wiring block?

A.
W-Green, Green-W, W-Orange, Blue-W, W-Blue, Orange-W, W-Brown, Brown-W

B.
W-Blue, Blue-W, W-Orange, Orange-W, W-Green, Green-W, W-Brown, Brown-W

C.
W-Orange, Orange-W, W-Green, Blue-W, W-Blue, Green-W, W-Brown, Brown-W

D.
W-Blue, Blue-W, W-Green, Green-W, W-Orange, Orange-W, W-Brown, Brown-W

A

The correct answer is: B

W-Blue, Blue-W, W-Orange, Orange-W, W-Green, Green-W, W-Brown, Brown-W

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25
Q

What is the nominal impedance of RG-11 (Series 11) cable?

A.
75 Ω

B.
100 Ω

C.
93 Ω

D.
53 Ω

A

The correct answer is: A
75 Ω

26
Q

What does the return loss value indicate?

A. Signal delay between the fastest and slowest pairs

B. Displacement of the signal in time

C. Reception of signals from adjacent pairs

D. Reflection of the signal in the cable

A

The correct answer is: D
Reflection of the signal in the cable

27
Q

What is the main purpose for the twists in twisted pair cable?

A. To decrease the diameter of the cable for tight installations

B. To ease the installation process

C. To help control crosstalk

D. To minimize propagation delay variations

A

The correct answer is: C

To help control crosstalk

28
Q

Which cable is used for CCTV (security) systems?

A. RG-8

B. RG-6

C. RG-75

D. RG-58

A

The correct answer is: B

RG-6

29
Q

Where is loose tube buffered, optical cable primarily used?

A. Indoors

B. As a patch cable

C. Outdoors

D. In plenums

A

The correct answer is: C

Outdoors

30
Q

Optical fiber digital transmission links typically uses 2 fibers. Based on that type of link, what is the transmission technique used on an individual fiber?
Select one:

A. Half duplex transmission

B. Simplex transmission

C. Isochronous transmission

D. Full duplex transmission

A

The correct answer is: B

Simplex transmission

31
Q

What is the approximate hole size in the ceramic ferrule of an SM ST connector?

A. 50 µm

B. 125 µm

C. 62.5 µm

D. 10 µm

A

The correct answer is: B

125 µm

32
Q

If multimode fiber has a loss of 3.5dB/km, what would be the loss of 2.8 km of multimode fiber?

A. 1.25 dB

B. 9.8 dB

C. 8.0 dB

D. 9.1 dB

A

The correct answer is: B

9.8 dB

33
Q

What connector uses IDC termination technology?

A. SC connectors

B. 110 connectors

C. N connectors

D. BNC connectors

A

The correct answer is: B

110 connectors

34
Q

What is the typical size of a OM1 fiber?

A. 62.5/12.5 µm

B. 62.5/1.25 µm

C. 62.5/125 µm

D. 6.25/1.25 µm

A

The correct answer is: C

62.5/125 µm

35
Q

Which cable performance parameters are changed when replacing a Cat. 5e cable system with a Cat. 6A cable system?
Select one:

A.
The Cat. 6A cable has a lower dB value for insertion loss and a lower dB value for NEXT

B.
The Cat. 6A cable has a lower dB value for insertion loss and a higher dB value for NEXT

C.
The Cat. 6A cable has a higher dB value for insertion loss and a higher dB value for NEXT

D.
The Cat. 6A has a higher dB value for insertion loss and a lower dB value for NEXT

A

The correct answer is: B

The Cat. 6A cable has a lower dB value for insertion loss and a higher dB value for NEXT

36
Q

What wavelength is used in low cost LED-based communication systems?

A.
125 nm

B.
850 nm

C.
62.5 nm

D.
50 nm

A

The correct answer is: B

850 nm

37
Q

Which of the following 48 strand non-armoured fiber cables has the largest outside diameter?

A. Breakout cable

B. Ribbon cable

C. Loose tube cable

D. Simplex cable

A

The correct answer is: A

Breakout cable

38
Q

Which network system uses a VCSELs?

A.
1000BASE-T

B.
1000BASE-SX

C.
100BASE-TX

D.
10BASE-T

A

The correct answer is: B

1000BASE-SX

39
Q

A 100 meters of cables has a characteristic impedance of 100 Ohms. What is the impedance of 50 meters of cable?
Select one:

A.
100 ohms

B.
141.4 ohms

C.
50 ohms

D.
200 ohms

A

The correct answer is: A
100 ohms

40
Q

According to TIA-568-C.2 standard, up to what frequency is Category 5e tested?

A. 100 MHz

B. 500 MHz

C. 200 MHz

D. 250 MHz

A

The correct answer is: A

100 MHz

41
Q

What is the nominal impedance of RG-59 (Series 59) cable?

A.
100 Ω

B.
50 Ω

C.
75 Ω

D.
59 Ω

A

The correct answer is: C
75 Ω

42
Q

What is the nominal impedance of RG-6 (Series 6) cable?

A.
75 Ω

B.
59 Ω

C.
50 Ω

D.
100 Ω

A

The correct answer is: A
75 Ω

43
Q

What is furcation (breakout) tube used for?

A.
For pressurizing a splice enclosure

B.
For protecting fiber strands at the end of a tight tube cable

C.
For protecting fiber strands at the end of a loose tube cable

D.
For venting a splice enclosure

A

The correct answer is: C
For protecting fiber strands at the end of a loose tube cable

44
Q

Which of the jack pin/pair assignments is backwards compatible with 2 pair USOC configuration?

A.
T568B

B.
Either T568A or T568B

C.
T568A

D.
Neither T568A nor T568B

A

The correct answer is: C
T568A

45
Q

What does a low dB number for return loss mean?

A.
A large percentage of the signal is reflected

B.
A small percentage of the signal is reflected

C.
The link used good quality cable , terminations and connectors

D.
Low level of impedance variation

A

The correct answer is: A
A large percentage of the signal is reflected

46
Q

What is the main advantage F/UTP has over UTP?

A.
Only F/UTP may be used in plenum applications

B.
Only F/UTP may be used in Power over Ethernet (PoE) applications

C.
F/UTP is much better at reducing reflectance

D.
Using F/UTP over UTP greatly reduces the induction or emission of noise

A

The correct answer is: D
Using F/UTP over UTP greatly reduces the induction or emission of noise

47
Q

Which cable is terminated with a BNC connector?

A. RG-8

B. RG-75

C. RG-11

D. RG-59

A

The correct answer is: D
RG-59

48
Q

Which of the following would be a typical size range of a 4-pair Category 5e UTP cable?

A.
0.10” to 0.19” diameter

B.
0.50” to 0.75” diameter

C.
0.20” to 0.32” diameter

D.
0.31” to 0.49” diameter

A

The correct answer is: C
0.20” to 0.32” diameter

49
Q

What is the relationship between wavelength and frequency?
Select one:

A.
Frequency is inversely proportional to wavelength

B.
Frequency is the square of the wavelength

C.
Frequency is the square root of wavelength

D.
Frequency is proportional to wavelength

A

The correct answer is: A
Frequency is inversely proportional to wavelength

50
Q

What is the nominal impedance of Category 6 UTP cable?
Select one:

A. 100 Ω

B. 500 Ω

C. 200 Ω

D. 250 Ω

A

The correct answer is: A
100 Ω

51
Q

Which cable type is terminated with an N connector?

A.
RG-59

B.
RG-58

C.
Series-6

D.
Series-11

A

The correct answer is: D
Series-11

52
Q

Where in an optical fiber is most of the light power concentrated?

A.
Core cladding interface

B.
Cladding

C.
Sheath

D.
Core

A

The correct answer is: D
Core

53
Q

Which cable has a drain wire?

A.
Tight buffered fiber

B.
Loose tube fiber

C.
F/UTP

D.
Coax

A

The correct answer is: C
F/UTP

54
Q

What are the two standard wavelengths that singlemode optical fiber supports?

A.
850 and 1550

B.
850 and 1300

C.
650 and 850

D.
1310 and 1550

A

The correct answer is: D
1310 and 1550

55
Q

Which cable is terminated with a F connector?

A. RG-75

B. RG-8

C. RG-6

D. RG-58

A

The correct answer is: C
RG-6

56
Q

What value of dB represents a halving of power?
Select one:

A. 2 dB

B. 0.25 dB

C. 3 dB

D. 0.5 dB

A

The correct answer is: C
3 dB

57
Q

What type of light source transmits a 1550 nm wavelength?

A.
LED

B.
VCSEL

C.
LASER

D.
ERBIUM

A

The correct answer is: C
LASER

58
Q

Which Ohm’s law formula is correct?
Select one:

A.
I=RV

B.
I=V/R

C.
V=I/R

D.
R=VI

A

The correct answer is: B
I=V/R

59
Q

What is the term used to describe the loss of light signal as it travels down the optical fiber strand?

A.
Propagation

B.
Scattering

C.
Dispersion

D.
Attenuation

A

The correct answer is: D
Attenuation

60
Q

How is a “Type B” MPO cable configured?

A.
The fiber from position 1 goes to position 1 at the other end

B.
The fiber from position 1 goes to position 6 at the other end

C.
The fiber from position 1 goes to position 12 at the other end

D.
The fiber from position 1 goes to position 2 at the other end

A

The correct answer is: C
The fiber from position 1 goes to position 12 at the other end

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