Cisco Chapter 3 Revision Guide

 

Question 1.

 

Which combination of will be attracted by electric force? (Choose two)

 

  1. Neutral and neutral
  2. Neutral and positive
  3. Neutral and negative
  4. Positive and positive
  5. Negative and negative
  6. Positive and negative
  7. Negative and positive

 

You will need to know your atoms and electrons section 3.1.1 in the curriculum.  Make detailed notes!

 

Question 2.

 

Select the characteristics specified by 10BASE5 (Choose 3)

 

  1. Often known as ‘Thicknet’
  2. T Style connectors
  3. Will travel 500mtrs before attenuation likely to occur
  4. 10kbps data transmission speed
  5. 10Mbps data transmission speed
  6. Baseband transmission
  7. Manchester encoding used for transmission

 

Learn all characteristics of Ethernet specifications!

 

Question 3.

 

List all the necessary conditions for the flow of current on a circuit.

 

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Question 4.

 

Which of the following are benefits of using STP Cable in a LAN Environment?

 

  1. Easier to install than coaxial cable
  2. Easier to ground than UTP Cable
  3. More resistant to EMI Interference than UTP Cable
  4. Cheaper than Fibre Optic cable
  5. Can travel further than Coaxial cable before attenuation occurs
  6. Requires fewer repeaters than UTP
  7. Faster transport speeds than Fibre Optic cable

Learn your benefits and drawbacks of using all types of media in a network.  List and make note of all the ups and downs!

 

Question 5.

 

Which effects comprise Impedance? (Choose 3)

 

  1. Capacitance
  2. Voltage
  3. Current
  4. Resistance
  5. Inductance
  6. Power

 

 

Learn about resistance and impedance. Section 3.1.3; make notes on the properties of resistance and impedance!

 

Question 6

 

Which of the following characteristics describe UTP cable? (Choose 3)

 

  1. Costs less than STP
  2. More difficult to install than STP
  3. Can carry signals also through metal shielding
  4. Uses twisted pairs
  5. More prone to outside interference than STP
  6. Can carry high frequency signals better than STP

 

Again, learn the properties and characteristics of all cable types!

 

Question 7

 

Which of the following best describe the ray model of light? (Choose 3)

 

  1. Light bends at the boundary of two transparent materials
  2. The speed of light is greatest when passing through optical glass
  3. The speed of light is constant no matter what material it passes through
  4. The optical density of material determines how much the light will bend
  5. The index of refraction is the ratio of the speed of light in a material compared to a vacuum

 

Learn the properties of light!

 

 

Question 8

 

Which two are necessary to achieve total light reflection within a fibre optic cable? (Choose two)

 

  1. The entire incident light ray must be refracted into the cladding
  2. The index of refraction of the core must be less than that of the cladding
  3. The index of refraction of the core must be greater than that of the cladding
  4. The optical density of the reflecting material must be higher than the refracting index
  5. The angle of incidence of the light ray must be greater than the critical angle for the core and cladding

 

Learn the properties of reflection and refraction in fibre optic cables; make detailed notes!

 

 

Question 9

 

Which of the following are properties of multimode fibre optic cable?  (Choose 3)

 

  1. Many paths of light
  2. Smaller fibre optic core
  3. Uses Lasers as light source
  4. Distances up to 20,000 metres
  5. Lower bandwidth than single mode
  6. Uses LED’s for light source

 

Learn the characteristics and properties of multi and single mode Fibre Optic cables and also their transmitters and receivers!

 

Question 10

 

What must we try to prevent in a Fibre Optic cable to avoid signal loss?

 

  1. Signal jitter
  2. Near-End Crosstalk
  3. Scattering
  4. EMI Interference
  5. Absorption
  6. Dispersion

 

Learn what causes signal loss in a fibre optic cable!

 

 

Question 11

 

List three tasks that must be performed when installing a fibre optic cable.

 

 

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

Question 12

 

What devices can interfere with a wireless transmission?

 

  1. Mobile Phone
  2. Microwave
  3. Television
  4. Radio
  5. CB Radio
  6. Coffee maker

 

Learn what causes interference on all mediums!

 

Question 13

 

List as many typical specifications for data transmission cables as you can find. i.e. Achievable bit transmission speeds.

 

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………....

 

Question 14

 

Which of the following radio carrier signal is used by wireless networks to superimpose the data signal onto the carrier signal that is broadcast by the transmitter?

 

  1. AM
  2. FM
  3. Digital
  4. PM
  5. RF

 

Learn all of the types of modulation and what they do!

 

Question 15

 

List all authentication and association types on a wireless network and what they mean.

 

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

 

Question 16

 

What actual throughput is normally available on a wireless network after we have accounted for the way WLANS actually transmit and receive data?

 

  1. 10%
  2. 20%
  3. 70%
  4. 85%
  5. 50%

 

 

Question 17

 

What’s the minimum number of devices that can exist on a wireless network?

 

  1. 1
  2. 2
  3. 12
  4. 4
  5. 7
  6. 10

 

 

Question 18

 

Which of the following wireless standards covers devices that operate in the 5GHZ band?

 

  1. 802.11
  2. 802.11b
  3. 802.11s
  4. 802.11c
  5. 802.11g
  6. 802.11a

 

Learn all the standards and what they cover and incorporate.

 

Question 19

 

Which term refers to the amount of signal power loss than can be tolerated on a Fibre Optic link?

 

  1. Linear laser light loss
  2. Optical link loss budget
  3. Acceptable decibel light loss
  4. Maximum allowable light attenuation
  5. Light corruption limit

 

 

Question 20

 

What is the core size of a multimode fibre optic cable?

 

  1. 10 microns
  2. 125 microns
  3. 50 or 62.5 microns
  4. 20 or 50 microns
  5. 34.5 or 25 microns
  6. 185 microns

 

Learn the core and cladding diameters for single and multi mode fibre cables!

 

Question 21

 

How is two way simultaneous communication achieved in a fibre optic cable?