Module 2

Question 1

T/F
Am and Fm radio transmits information digitally

Answer 1

False

Question 2

Non return to zero(NRZ) is an error detection method

Answer 2

False

Question 3

T/F

A time domain reflectometer sends a signal and analyzes the return signal’s change to determine where cable imperfections may exist.

Answer 3

True

Question 5

T/F
Multimode fiber contains a core that is larger than single mode fiber

Answer 5

False

Question 6

T/F
Power over Ethernet requires Cat 6 or better

Answer 6

False

Question 7

Which of the following statements about fiber-optic cabling is accurate?
• Fiber-optic cable is cheaper than shielded twisted pair cabling.
• Fiber-optic cabling has a low resistance to signal noise.
The maximum length for a fiber segment is 20km.
• Light experiences virtually no resistance when traveling through glass.

Answer 7

Light experiences virtually no resistance when travelling through glass

Question 8

What technique is used with UTP to help protect against signal interference from cross talk?

Answer 8

Twisting the wires together into pairs

Question 9

The radius of the maximum arc into where you can loop a cable without impairing data transmission is called

Answer 9

Bend radius

Question 10

What is jitter

Answer 10

Jitter is what happens when packets experience varying amounts of delay and arrive out of order.

Question 11

What is not an example of broad band transmission

Answer 11

Ethernet

Question 12

Which type of modulation occurs when the amplitude of the carrier wave is modified by the application of the data signal?

Answer 12

Amplitude modulation

Question 13

What is the fastest Ethernet standard that can possibly be used on twisted pair cabling

Answer 13

10GBase-T

Question 14

What type of transmission is measured by baud rate

Answer 14

Analog

Question 15

Noise that can degrade a signal on a network is measured in

Answer 15

Decibels

Question 16

Why should you terminate coaxial cable with connectors that are rated for the exact cable type?

Answer 16

A mismatched connector will have different impedance ratings, causing data errors.

Question 17

What string represents Unicode

Answer 17

U007BH

Question 18

During termination of twisted pair cabling, what should be done to ensure minimal cross talk is introduced?

Answer 18

No more than 1 inch of the cable should be exposed.

Question 19

What statement describes a transmission flaw that is occurring due to attenuation?
A customer’s video conferencing application is experiencing delay in audio and video that comes and goes.
A customer’s wi-fi is continuously losing signal due to large distance from the transmitting device.
A network switch interface is dropping due to a powerful radio transmitter in the adjacent room.
Two network interfaces are experiencing problems at the same time due to the cables having adjacent
runs.

Answer 19

A customers wifi is continuously losing signal due to long distance from the transmitting device

Question 20

What multiplexing assigns slots to nodes according to slots and needs

Answer 20

Statisitical multiplexing

Question 21

What is the minimum cable category for UTP cable required for gigabit speeds

Answer 21

Cat 5e

Question 22

Which type of connector does a network interface card use to connect to the cable

Answer 22

RJ-45

Question 23

Describe optical loss

Answer 23

Optical loss occurs over long distances.
• Optical loss grows with every connection point in the fiber network. v Dust or oil in a connection can further exacerbate optical loss.

Question 24

In Manchester encoding:

Answer 24

the clock pulse is embedded into the signal
• the logical state is based on the voltage level transition

Question 25

Question 26(1 point) v Saved A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and ESU(electro-surgical unit). What two factors may interfere with the copper cabling and result in signal distortion and data corruption?

Answer 25

RFI and EMI

Question 26

The 3 cables recognized by TIA/EIA are

Answer 26

Unshieled twisted pair, shielded twisted pair and fiber optic

Question 27

The maximum allowable distances for horizontal wiring for a span that connects a data jack on a wall to a data closet is meter, and for a span that connects a workstation to the data jack is __meter respectively.

Answer 27

1. 90m 2 10m

Question 28

The most fault tolerant type of physical topology

Answer 28

Is the mesh network. It provides multiple routes for data to flow between any 2 points

Question 29

Simplex

Answer 29

Signals can only travel 1 direction in a medium

Question 30

Half duplex

Answer 30

Signals can travel both directions on a medium but only 1 at a time

Question 31

Full duplex

Answer 31

Signals can travel both directions over a medium at the same time

Question 32

Given 3 bps size

Answer 32

Gooput is the smallest Bandwidth is the biggest Throu gf put is the middle value

Question 33

Mulitmodr fibre

Answer 33

Has an led as as the light source Generally used with LANs There’s several paths of light that go into the fiber Generally

Question 34

Single mode fiber

Answer 34

Has a laser as the light source - there is only 1 ray of light into the fiber - generally used for campus backbone